CompTIA Network+ Certification

1. A user calls to report that he is experiencing periodic problems connecting to the network. Upon investigation, you find that the cable connecting the user’s PC to the switch is close to a fluorescent light fitting. What condition is most likely causing the problem?

Crosstalk

EMI

Attenuation

Faulty cable

EMI is a type of interference that is often seen when cables run too close to electrical devices. Crosstalk is when two cables interfere with each other. Attenuation is a
loss of signal strength. Answer D is incorrect also. It may be that a faulty cable is causing the problem. However, the question asked for the most likely cause. Because the cable is running near fluorescent lights, the problem is more likely associated with EMI.

Explanation

EMI is a type of interference that is often seen when cables run too close to electrical devices. Crosstalk is when two cables interfere with each other. Attenuation is a
loss of signal strength. Answer D is incorrect also. It may be that a faulty cable is causing the problem. However, the question asked for the most likely cause. Because the cable is running near fluorescent lights, the problem is more likely associated with EMI.

2. Which of the following connectors is commonly used with fiber cabling?

RJ-45

BNC

SC

RJ-11

SC connectors are used with fiber-optic cable. RJ-45 connectors are used with UTP cable, BNC is used for thin coax cable, and RJ-1 1 is used for regular phone connectors.

Explanation

SC connectors are used with fiber-optic cable. RJ-45 connectors are used with UTP cable, BNC is used for thin coax cable, and RJ-1 1 is used for regular phone connectors.

3. Which of the following describes the loss of signal strength as a signal travels through a particular medium?

Attenuation

Crosstalk

EMI

Chatter

The term used to describe the loss of signal strength for media is attenuation. Crosstalk refers to the interference between two cables, EMI is electromagnetic interference, and chatter is not a valid media interference concern.

Explanation

The term used to describe the loss of signal strength for media is attenuation. Crosstalk refers to the interference between two cables, EMI is electromagnetic interference, and chatter is not a valid media interference concern.

4. Which of the following devices could be configured as a DHCP server?

Wireless router

Unmanaged switch

Hub

Repeater

5. Which network topology offers the greatest level of redundancy but has the highest implementation cost?

Wireless mesh

Wired mesh

Hybrid star

Bus network

The mesh topology requires each computer on the network to be individually connected to every other device. This configuration provides maximum reliability and redundancy for the network. However, it is very costly to implement due to the multiple wiring requirements.

Explanation

The mesh topology requires each computer on the network to be individually connected to every other device. This configuration provides maximum reliability and redundancy for the network. However, it is very costly to implement due to the multiple wiring requirements.

6. Which of the following should be implemented to allow a user to securely connect to a network drive remotely?

Enable file and print share

FTP

VPN

Map a drive

7. In a 100BaseTX network environment, what is the maximum distance between the device and the networking equipment, assuming that no repeaters are used?

1,000 meters

100 meters

500 meters

185 meters

100BaseT networks use UTP cabling, which has a maximum cable length of 100 meters. Answer A is incorrect because this distance could only be achieved with UTP cabling by using repeaters. Answer C specifies the maximum cable length for 10Base5 networks. Answer D specifies the maximum cable length for 10Base2 networks.

Explanation

100BaseT networks use UTP cabling, which has a maximum cable length of 100 meters. Answer A is incorrect because this distance could only be achieved with UTP cabling by using repeaters. Answer C specifies the maximum cable length for 10Base5 networks. Answer D specifies the maximum cable length for 10Base2 networks.

8. TCP is an example of what kind of transport protocol?

Connection-oriented

Connection-reliant

Connection-dependent

Connectionless

TCP is an example of a connection-oriented transport protocol. UDP is an example of a connectionless protocol. Connection-reliant and connection-dependent are not terms commonly associated with protocols.

Explanation

TCP is an example of a connection-oriented transport protocol. UDP is an example of a connectionless protocol. Connection-reliant and connection-dependent are not terms commonly associated with protocols.

9. As the network administrator, you decide to block port 80. Which of the following services will be unavailable for network users?

DNS

POP3

FTP

HTTP

The HTTP service uses port 80, so blocking port 80 prevents users from using the HTTP service. Answer A is incorrect because DNS uses port 53. Answer B is incorrect because POP3 uses port 110. Answer C is incorrect because FTP uses port 21.

Explanation

The HTTP service uses port 80, so blocking port 80 prevents users from using the HTTP service. Answer A is incorrect because DNS uses port 53. Answer B is incorrect because POP3 uses port 110. Answer C is incorrect because FTP uses port 21.

10. Which of the following connectors would be used if the EIA/TIA 568 scheme is followed?

ST

RJ-11

RJ-45

MT-RJ

11. At which OSI layer does a switch operate?

Layer 1

Layer 2

Layer 3

Layer 4

A switch uses the MAC addresses of connected devices to make its forwarding decisions. Therefore, it is called a data link, or Layer 2, network device. Devices or components that operate at Layer 1 typically are media-based, such as cables or connectors. An example of a Layer 3 device is a router. Layer 4 components typically are software-based, not hardware-based.

Explanation

A switch uses the MAC addresses of connected devices to make its forwarding decisions. Therefore, it is called a data link, or Layer 2, network device. Devices or components that operate at Layer 1 typically are media-based, such as cables or connectors. An example of a Layer 3 device is a router. Layer 4 components typically are software-based, not hardware-based.

12. You ask your ISP to assign a public IP address for the external interface of your Windows 2000 server, which is running a proxy server application. In the e-mail message you get that contains the information, the ISP tells you that you have been assigned the IP address 203.15.226.12/24. When you fill out the subnet mask field on the IP configuration dialog box on your system, what subnet mask should you use?

255.255.255.255

255.255.255.0

255.255.240.0

255.255.255.240

In CIDR terminology, the number of bits to be included in the subnet mask is expressed as a slash value. If the slash value is 24, the first three octets form the subnet mask, so the value is 255.255.255.0.

Explanation

In CIDR terminology, the number of bits to be included in the subnet mask is expressed as a slash value. If the slash value is 24, the first three octets form the subnet mask, so the value is 255.255.255.0.

13. A user is unable to reach the Internet. The technician asks the user to do an IPCONFIG /all. The user reports that their IP address is 172.20.1.18, subnet mask is 255.255.255.0, and their default gateway is 172.16.1.18. Which of the following is the cause of the problem?

Default gateway

Network cable

Subnet mask

CNAME record

14. You have been asked to install a network that will give the network users the greatest amount of fault tolerance. Which of the following network topologies would you choose?

Star

Ring

Mesh

Bus

A mesh network uses a point-to-point connection to every device on the network. This creates multiple points for the data to be transmitted around the network and therefore creates a high degree of redundancy. The star, ring and bus topologies do not offer fault tolerance.

Explanation

A mesh network uses a point-to-point connection to every device on the network. This creates multiple points for the data to be transmitted around the network and therefore creates a high degree of redundancy. The star, ring and bus topologies do not offer fault tolerance.

15. You have been tasked with temporarily disabling Telnet access for external users. What is the best way to accomplish this?

Block port 53 on the corporate firewall

Block port 23 on the corporate firewall

Uninstall the Telnet service

Configure ICS to ignore client-initiated Telent requests

By blocking port 23, you can disable the Telnet service. Answer A is incorrect because port 53 is used by DNS. Uninstalling the Telnet service is not a practical solution.

Explanation

By blocking port 23, you can disable the Telnet service. Answer A is incorrect because port 53 is used by DNS. Uninstalling the Telnet service is not a practical solution.

16. Assuming that the bridge priority is the same between four switches, identify which switch will become the root bridge in 802.1d if all four switches are interconnected.

Switch 1 (MAC Address = aa:aa:aa:aa:aa:aa

Switch 2 (MAC Address = bb:bb:bb:bb:bb:bb

Switch 3 (MAC Address = cc:cc:cc:cc:cc:cc

Switch 4 (MAC Address = dd:dd:dd:dd:dd:dd

17. Which of the following topologies allows for network expansion with the least amount of disruption for the current network users?

Bus

Ring

LAN

Star

On a star network, each network device uses a separate cable to make a point-topoint connection to a centralized device such as a hub. With such a configuration, a new device can be added to the network by attaching the new device to the hub with its own cable. This process does not disrupt the users who are currently on the network. Answers A and B are incorrect because the addition of new network devices on a ring or bus network can cause a disruption in the network and cause network services to be unavailable during the installation of a new device.

Explanation

On a star network, each network device uses a separate cable to make a point-topoint connection to a centralized device such as a hub. With such a configuration, a new device can be added to the network by attaching the new device to the hub with its own cable. This process does not disrupt the users who are currently on the network. Answers A and B are incorrect because the addition of new network devices on a ring or bus network can cause a disruption in the network and cause network services to be unavailable during the installation of a new device.

18. Users are complaining that the network’s performance is unsatisfactory. It takes a long time to pull files from the server, and, under heavy loads, workstations can become disconnected from the server. The network is heavily used, and a new videoconferencing application is about to be installed. The network is a 100BaseT system created with Ethernet hubs. Which device are you most likely to install to alleviate the performance problems?

Switch

Router

Bridge

Gateway

Replacing Ethernet hubs with switches can yield significant performance improvements. Of the devices listed, switches are also the only ones that can be substituted for hubs. A router is used to separate networks, not as a connectivity point for workstations. A bridge could be used to segregate the network and therefore improve performance, but a switch is a more obvious choice in this example. A gateway is a device, system, or application that translates data from one format into another.

Explanation

Replacing Ethernet hubs with switches can yield significant performance improvements. Of the devices listed, switches are also the only ones that can be substituted for hubs. A router is used to separate networks, not as a connectivity point for workstations. A bridge could be used to segregate the network and therefore improve performance, but a switch is a more obvious choice in this example. A gateway is a device, system, or application that translates data from one format into another.

19. Which of the following devices would you find only on a token ring network?

Hub

Switch

MSAU

Router

A Multistation Access Unit (MSAU) is used as the connectivity point on a token ring network. Switches and hubs are associated with Ethernet networks. Routers can be found on both token ring and Ethernet networks.

Explanation

A Multistation Access Unit (MSAU) is used as the connectivity point on a token ring network. Switches and hubs are associated with Ethernet networks. Routers can be found on both token ring and Ethernet networks.

20. During a discussion with your ISP's technical support representative, he mentions that you might have been using the wrong FQDN. Which TCP/IP-based network service is he referring to?

DHCP

WINS

SNMP

DNS

DNS is a system that resolves hostnames to IP addresses. The term FQDN is used to describe the entire hostname. None of the other services use FQDNs.

Explanation

DNS is a system that resolves hostnames to IP addresses. The term FQDN is used to describe the entire hostname. None of the other services use FQDNs.

21. Under what circumstance would you change the default channel on an access point?

When channel overlap occurs between access points

To release and renew the SSID

To increase WEP security settings

To decrease WEP security settings

Ordinarily the default channel used with a wireless device is adequate; however, you might need to change the channel if overlap occurs with another nearby access point. The channel should be changed to another, nonoverlapping channel. Changing the channel would not impact the WEP security settings.

Explanation

Ordinarily the default channel used with a wireless device is adequate; however, you might need to change the channel if overlap occurs with another nearby access point. The channel should be changed to another, nonoverlapping channel. Changing the channel would not impact the WEP security settings.

22. Which of the following is not a type of fiber-optic connector used in network implementations?

MT-RJ

SC

BNC

LC

BNC is a connector type used with coaxial cabling. It is not used as a connector for fiber-optic cabling. MT-RJ, SC, and LC are all recognized types of fiber-optic connectors.

Explanation

BNC is a connector type used with coaxial cabling. It is not used as a connector for fiber-optic cabling. MT-RJ, SC, and LC are all recognized types of fiber-optic connectors.

23. What is the function of NTP?

It provides a mechanism for the sharing of authentication information

It is used to access shared folders on a Linux system

It is used to communicate utilization information to a central manager

It is used to communicate time synchronization information between systems

NTP is used to communicate time synchronization information between devices. NFS (Network File System) is a protocol typically associated with accessing shared folders on a Linux system. Utilization information is communicated to a central management system most commonly by using the SNMP protocol.

Explanation

NTP is used to communicate time synchronization information between devices. NFS (Network File System) is a protocol typically associated with accessing shared folders on a Linux system. Utilization information is communicated to a central management system most commonly by using the SNMP protocol.

24. A client on your network has had no problems accessing the wireless network in the past, but recently she moved to a new office. Since the move she has been unable to access the network. Which of the following is most likely the cause of the problem?

The SSIDs on the client and the AP are different

The SSID has been erased

The client has incorrect WEP settings

The client system has moved too far from the access point

An AP has a limited distance that it can send data transmissions. When a client system moves out of range, it can’t access the AP. Many strategies exist to increase transmission distances, including RF repeaters, amplifiers, and buying more powerful antennas. The problem is not likely related to the SSID or WEP settings, because the client had access to the network before, and no settings were changed.

Explanation

An AP has a limited distance that it can send data transmissions. When a client system moves out of range, it can’t access the AP. Many strategies exist to increase transmission distances, including RF repeaters, amplifiers, and buying more powerful antennas. The problem is not likely related to the SSID or WEP settings, because the client had access to the network before, and no settings were changed.

25. A company is upgrading from DSL to a new T1. When the ISP sends a technician out, the technician will terminate the T1 at which of the following locations in the building?

Patch panel

Firewall

Switch

Demarc

26. Which of the following devices forwards data packets to all connected ports?

Router

Switch

Bridge

Hub

Hubs are inefficient devices that send data packets to all connected devices. Many of today’s networks are upgrading to switches that pass data packets to the specific destination device. This method significantly increases network performance.

Explanation

Hubs are inefficient devices that send data packets to all connected devices. Many of today’s networks are upgrading to switches that pass data packets to the specific destination device. This method significantly increases network performance.

27. A technician is looking for an emergency connection solution not reliant on local data or power services. Which of the following should the technician implement?

Satellite

ADSL

ISDN

OC-3

28. Which of the following is the MOST accurate description of a L2/L3 switch?

Performs switching and routing duties

A router that directly connects to a switch

A multi-purpose switch fabric used in full mesh environments

A switch that directly connects to a router

29. You have been asked to connect two office locations. It has been specified that a wireless link be used. Which of the following strategies would you use to connect the two offices?

Point-to-point

Wireless mesh

PtMP

Star bus hybrid

In a point-to-point (PtP) wireless configuration, the communication link travels from one node directly to one other node. Wireless point-to-point systems are often used in wireless backbone systems such as microwave relay communications, or as a replacement for a single wired communication cable. The point-to-point link can be used to connect two locations to share data and resources.

Explanation

In a point-to-point (PtP) wireless configuration, the communication link travels from one node directly to one other node. Wireless point-to-point systems are often used in wireless backbone systems such as microwave relay communications, or as a replacement for a single wired communication cable. The point-to-point link can be used to connect two locations to share data and resources.

30. You have been hired to establish a WAN connection between two offices - one in Vancouver and one in Seattle. The transmission speed can be no less than 24 Mbps. Which of the following technologies could you choose?

T1

PSTN

T3

ISDN

The only possible answer that is capable of transfer speeds above 2Mbps is a T3 line. None of the other technologies listed can provide the transmission speed required.

Explanation

The only possible answer that is capable of transfer speeds above 2Mbps is a T3 line. None of the other technologies listed can provide the transmission speed required.

31. Which of the following wireless protocols operate at 2.4 GHz? (Select two.)

802.11a

802.11b

802.11g

802.11t

Wireless standards specify an RF range on which communications are sent. The 802.11b and 802.11g standards use the 2.4GHz range. 802.11a uses the 5GHz range. 802.11t is not a valid standard.

Explanation

Wireless standards specify an RF range on which communications are sent. The 802.11b and 802.11g standards use the 2.4GHz range. 802.11a uses the 5GHz range. 802.11t is not a valid standard.

Submit

32. Which of the following protocols offers guaranteed delivery?

FTP

IPX

IP

TCP

TCP is a connection-oriented protocol that guarantees delivery of data. FTP is a protocol used to transfer large blocks of data. IPX stands for Internetwork Packet Exchange. IP is a network layer protocol that’s responsible for tasks such as addressing and route discovery.

Explanation

TCP is a connection-oriented protocol that guarantees delivery of data. FTP is a protocol used to transfer large blocks of data. IPX stands for Internetwork Packet Exchange. IP is a network layer protocol that’s responsible for tasks such as addressing and route discovery.

33. Which of the following statements are associated with a bus LAN network? (Choose all correct answers)

A single cable break can cause complete network disruption

All devices connect to a central device

It uses a single backbone to connect all network devices

It uses a dual-ring configuration

In a bus network, a single break in the network cable can disrupt all the devices on that segment of the network, a significant shortcoming. A bus network also uses a single cable as a backbone to which all networking devices attach. A star network requires networked devices to connect to a centralized device such as a hub or MSAU. Therefore, answer B is incorrect.

Explanation

In a bus network, a single break in the network cable can disrupt all the devices on that segment of the network, a significant shortcoming. A bus network also uses a single cable as a backbone to which all networking devices attach. A star network requires networked devices to connect to a centralized device such as a hub or MSAU. Therefore, answer B is incorrect.

Submit

34. You are the administrator for a network with two Windows Server systems and 65 Windows Vista systems. At 10 A.M. three users call to report that they are experiencing network connectivity problems. Upon investigation, you determine that the DHCP server has failed. How can you tell that the DHCP server failure is the cause of the connectivity problems experienced by the three users?

When you check their systems, they have an IP address of 0.0.0.0

When you check their systems, they have an IP address in the 192.168.x.x. address range

When you check their systems, they have a default gateway value of 255.255.255.255

When you check their systems, they have an IP address from the 169.254.x.x range

When a Windows XP Professional system that is configured to obtain an IP address via DHCP fails to obtain an address, it uses APIPA to assign itself an address from the 169.254.x.x address range. An address of 0.0.0.0 normally results from a system that does not support APIPA. APIPA does not use the 192.168.x.x address range. The IP address 255.255.255.255 is the broadcast address. A DHCP failure would not lead to a system assigning itself this address.

Explanation

When a Windows XP Professional system that is configured to obtain an IP address via DHCP fails to obtain an address, it uses APIPA to assign itself an address from the 169.254.x.x address range. An address of 0.0.0.0 normally results from a system that does not support APIPA. APIPA does not use the 192.168.x.x address range. The IP address 255.255.255.255 is the broadcast address. A DHCP failure would not lead to a system assigning itself this address.

35. Which of the following is an advantage of ISDN over PSTN?

ISDN is more reliable

ISDN is cheaper

ISDN is faster

ISDN uses 53 kbps fixed-length packets

One clear advantage that ISDN has over the PSTN is its speed. ISDN can combine 64Kbps channels for faster transmission speeds than the PSTN can provide. ISDN is no more or less reliable than the PSTN. ISDN is more expensive than the PSTN. Answer D describes ATM.

Explanation

One clear advantage that ISDN has over the PSTN is its speed. ISDN can combine 64Kbps channels for faster transmission speeds than the PSTN can provide. ISDN is no more or less reliable than the PSTN. ISDN is more expensive than the PSTN. Answer D describes ATM.

36. Which of the following are considered link state protocols?

RIPv2 and EIGRP

EGP and IGP

OSPF and IS-IS

RIP and BGP

37. Which of the following statements best describes a VPN?

It provides a system whereby only screen display and keyboard and mouse input travel across the link

It is a secure communication channel across a public network such as the Internet

It is a protocol used to encrypt user IDs and passwords

A VPN provides a secure communication path between devices over a public network such as the Internet.

Explanation

A VPN provides a secure communication path between devices over a public network such as the Internet.

38. Of the following routing methods, which is likely to require the most administration time in the long term?

Static

Link state

Distance vector

Dynamic

Static routing takes more time to administer in the long term, because any changes to the network routing table must be entered manually. Distance vector and link state are both dynamic routing methods. Dynamic routing might take more time to configure initially, but in the long term, it requires less administration time. It can adapt to changes in the network layout automatically.

Explanation

Static routing takes more time to administer in the long term, because any changes to the network routing table must be entered manually. Distance vector and link state are both dynamic routing methods. Dynamic routing might take more time to configure initially, but in the long term, it requires less administration time. It can adapt to changes in the network layout automatically.

39. Which of the following are considered transport protocols? (Choose the two best answers)

TCP

IP

UDP

THC

Both TCP and UDP are transport protocols. IP is a network protocol, and THC is not a valid protocol.

Explanation

Both TCP and UDP are transport protocols. IP is a network protocol, and THC is not a valid protocol.

Submit

40. Which of the following is a Class B address?

129.16.12.200

126.15.16.122

211.244.212.5

193.17.101.27

Class B addresses fall into the range 128 to 191. Answer A is the only address listed that falls into that range. Answer B is a Class A address, and answers C and D are Class C IP addresses.

Explanation

Class B addresses fall into the range 128 to 191. Answer A is the only address listed that falls into that range. Answer B is a Class A address, and answers C and D are Class C IP addresses.

41. 10GBase-T is backwards compatible with which of the following? (Select TWO)

10GBase-SW

100Base-FX

10GBase-LW

100Base-T

10Base-T

Submit

42. Your manager has asked you to specify a high-speed 10GbE link to provide connectivity between two buildings 3 kilometers from each other. Which of the following IEEE standards are you likely to recommend?

10GBaseLR

10GBaseSR

10GBaseT4

10GBaseFL

10GBaseLR can be used over distances up to 10 km. 10GBaseSR can only be used up to a maximum distance of 300 meters. 10GBaseT4 and 10GBaseFL are not recognized 10 Gigabit Ethernet standards.

Explanation

10GBaseLR can be used over distances up to 10 km. 10GBaseSR can only be used up to a maximum distance of 300 meters. 10GBaseT4 and 10GBaseFL are not recognized 10 Gigabit Ethernet standards.

43. What kind of cable would you associate with an F-type connector?

Fiber-optic

UTP

Coaxial

STP

F-type connectors are used with coaxial cables. They are not used with fiber-optic,Unshielded Twisted Pair (UTP), or Shielded Twisted Pair (STP) cabling.

Explanation

F-type connectors are used with coaxial cables. They are not used with fiber-optic,Unshielded Twisted Pair (UTP), or Shielded Twisted Pair (STP) cabling.

44. Which of the following devices passes data based on the MAC address?

Hub

Switch

MSAU

Router

When determining the destination for a data packet, the switch learns the MAC address of all devices attached to it and then matches the destination MAC address in the data it receives. None of the other devices listed passes data based solely on the MAC address.

Explanation

When determining the destination for a data packet, the switch learns the MAC address of all devices attached to it and then matches the destination MAC address in the data it receives. None of the other devices listed passes data based solely on the MAC address.

45. What is the IPv6 equivalent of 127.0.0.1? (Choose two)

0:0:0:0:0:0:0:1

0:0:0:0:0:0:0:24

::1

::24

The IPv4 address 127.0.0.1 is reserved as the loopback address, and IPv6 has the same reservation. IPv6 addresses 0:0:0:0:0:0:0:0 and 0:0:0:0:0:0:0:1 are reserved as the loopback addresses. The address 0:0:0:0:0:0:0:1 can be shown using the :: notation with the 0s removed, resulting in ::1.

Explanation

The IPv4 address 127.0.0.1 is reserved as the loopback address, and IPv6 has the same reservation. IPv6 addresses 0:0:0:0:0:0:0:0 and 0:0:0:0:0:0:0:1 are reserved as the loopback addresses. The address 0:0:0:0:0:0:0:1 can be shown using the :: notation with the 0s removed, resulting in ::1.

Submit

46. Which of the following best describes the function of the default gateway?

It provides the route for destinations outside the local network

It enables a single Internet connection to be used by several users

It identifies the local subnet and formulates a routing table

It is used to communicate in a multiple-platform environment

The default gateway enables systems on one local subnet to access those on another. Answer B describes Internet Connection Sharing (ICS). Answers C and D don’t describe the main function of a default gateway.

Explanation

The default gateway enables systems on one local subnet to access those on another. Answer B describes Internet Connection Sharing (ICS). Answers C and D don’t describe the main function of a default gateway.

47. As a network administrator, you are called in to troubleshoot a problem on a token ring network. The network uses two MSAUs connected using the ring-in ports on both devices. All network cards are set at the same speed. What is the likely cause of the problem?

Bad network card

Faulty cabling

MSAU configuration

Network card configuration

To create the complete ring, the ring-in (RI) port on each MSAU is connected to the ring-out (RO) port on another MSAU. The last MSAU in the ring is then connected tot he first to complete the ring.

Explanation

To create the complete ring, the ring-in (RI) port on each MSAU is connected to the ring-out (RO) port on another MSAU. The last MSAU in the ring is then connected tot he first to complete the ring.

48. Which of the following fiber connectors uses a twist-type connection method?

ST

SC

BNC

SA

ST fiber connectors use a twist-type connection method. SC connectors use a pushtype connection method. The other choices are not valid fiber connectors.

Explanation

ST fiber connectors use a twist-type connection method. SC connectors use a pushtype connection method. The other choices are not valid fiber connectors.

49. You decide to move your network from NetBEUI to TCP/IP. For the external interfaces, you decide to obtain registered IP addresses from your ISP, but for the interal network, you choose to configure systems by using one of the private address ranges. Of the following address ranges, which one would you NOT consider?

192.168.0.0 to 192.168.255.255

131.16.0.0 to 131.16.255.255

10.0.0.0 to 10.255.255.255

172.16.0.0 to 172.31.255.255

The 131.16 range is from the Class B range and is not one of the recognized private IP address ranges. All the other address ranges are valid private IP address ranges.

Explanation

The 131.16 range is from the Class B range and is not one of the recognized private IP address ranges. All the other address ranges are valid private IP address ranges.

50. Which of the following technologies require dialup access? (Choose the two best answers)

FDDI

ISDN

Packet switching

The PSTN

Both the PSTN and ISDN require dialup connections to establish communication sessions.

Explanation

Both the PSTN and ISDN require dialup connections to establish communication sessions.

Submit

51. You are installing a wireless network solution, and you require a standard that can operate using either 2.4 GHz or 5 GHz frequencies. Which of the following standards would you choose?

802.11a

802.11b

802.11g

802.11n

The IEEE standard 802.11n can use either the 2.4GHz or 5GHz radio frequencies. 802.11a uses 5GHz, and 802.11b and 802.11g use 2.4GHz.

Explanation

The IEEE standard 802.11n can use either the 2.4GHz or 5GHz radio frequencies. 802.11a uses 5GHz, and 802.11b and 802.11g use 2.4GHz.

52. A company has installed a new 802.11g point-to-point connection between two buildings and is experiencing low throughput across the link. The current setup involves a wireless bridge on the roof with an omni-directional antenna. Which of the following would BEST improve the link performance?

Replace the wireless bridges with wireless access points

Install bi-directional amplifiers at both sites

Configure channel hopping on both wireless bridges

Replace the omni-directional antennas with Yagi antennas

53. You purchase a new wireless access point that uses no WEP security by default. You change the security settings to use 128-bit encryption. How must the client systems be configured?

All client systems must be set to 128-bit encryption

The client system inherits security settings from the AP

WEP does not support 128-bit encryption

The client WEP settings have to be set to autodetect

On a wireless connection between an access point and the client, each system must be configured to use the same WEP security settings. In this case, they must both be configured to use 128-bit encryption.

Explanation

On a wireless connection between an access point and the client, each system must be configured to use the same WEP security settings. In this case, they must both be configured to use 128-bit encryption.

54. A technician would use a physical network diagram to determine:

The cause of routing errors

The number of switches on the network

The number of users on the network

Where network latency will occur

55. What is the function of ARP?

It resolves MAC addresses to IP addresses

It resolves NetBIOS names to IP addresses

It resolves IP addresses to MAC addresses

It resolves hostnames to IP addresses

ARP resolves IP addresses to MAC addresses. Answer A describes the function of RARP, Answer B describes the process of WINS, and Answer D describes the process of DNS resolution.

Explanation

ARP resolves IP addresses to MAC addresses. Answer A describes the function of RARP, Answer B describes the process of WINS, and Answer D describes the process of DNS resolution.

56. All of the following will interfere with a 2.4 GHz wireless phone EXCEPT:

Bluetooth

802.11a

802.11b

802.11g

57. You are installing a wireless network solution that uses a feature known as MIMO. Which wireless networking standard are you using?

802.11a

802.11b

802.11g

802.11n

MIMO is used by the 802.11n standard and takes advantage of multiplexing to increase the range and speed of wireless networking. Multiplexing is a technique that combines multiple signals for transmission over a single line or medium. MIMO enables the transmission of multiple data streams traveling on different antennas in the same channel at the same time. A receiver reconstructs the streams, which have multiple antennas.

Explanation

MIMO is used by the 802.11n standard and takes advantage of multiplexing to increase the range and speed of wireless networking. Multiplexing is a technique that combines multiple signals for transmission over a single line or medium. MIMO enables the transmission of multiple data streams traveling on different antennas in the same channel at the same time. A receiver reconstructs the streams, which have multiple antennas.

58. Which of the following 10 Gigabit Ethernet standards has the greatest maximum transmission distance?

10GBaseSR

10GBaseER

10GBaseLR

10GBaseXR

The 10GBaseER standard specifies a maximum transmission distance of 40,000 meters. The 1 0GBaseSR standard specifies a maximum transmission distance of 300 meters, whereas 10GBaseLR specifies a maximum transmission distance of 10,000 meters. 1 0GBaseXR is not a recognized 10 Gigabit Ethernet standard.

Explanation

The 10GBaseER standard specifies a maximum transmission distance of 40,000 meters. The 1 0GBaseSR standard specifies a maximum transmission distance of 300 meters, whereas 10GBaseLR specifies a maximum transmission distance of 10,000 meters. 1 0GBaseXR is not a recognized 10 Gigabit Ethernet standard.

59. Which of the following are valid ways to assign computers to a VLAN? (select THREE)

Protocol assignment

Port-based assignment

NetBIOS computer name

MAC address

VLANs can be created by using protocol assignments, by defining the ports on a device as belonging to a VLAN or by using MAC addresses. VLANs cannot be created by using the NetBIOS computer name.

Explanation

VLANs can be created by using protocol assignments, by defining the ports on a device as belonging to a VLAN or by using MAC addresses. VLANs cannot be created by using the NetBIOS computer name.

Submit

60. Which of the following are required to establish a VPN connection? (Choose all correct answers)

VPN server

VPN client

VPN protocols

VPN MAC identification

Many elements are involved in establishing a VPN connection. This includes the VPN client to initiate the session, the VPN server to answer the client requests, and the VPN protocols to secure and establish the connection.

Explanation

Many elements are involved in establishing a VPN connection. This includes the VPN client to initiate the session, the VPN server to answer the client requests, and the VPN protocols to secure and establish the connection.

Submit

61. Which of the following best describes the process of creating a dedicated circuit between two communication endpoints and directing traffic between those two points?

Multiplexing

Directional addressing

Addressing

Circuit switching

Circuit switching is the process of creating a dedicated circuit between two communications endpoints and directing traffic between those two points. None of the other answers are valid types of switching.

Explanation

Circuit switching is the process of creating a dedicated circuit between two communications endpoints and directing traffic between those two points. None of the other answers are valid types of switching.

62. Which of the following are sublayers of the data link layer? (Choose two)

MAC

LCL

Session

LLC

The data link layer is broken into two distinct sublayers—Media Access Control (MAC) and Logical Link Control (LLC). LCL is not a valid term. Session is another of the OSI model layers.

Explanation

The data link layer is broken into two distinct sublayers—Media Access Control (MAC) and Logical Link Control (LLC). LCL is not a valid term. Session is another of the OSI model layers.

Submit

63. What topology is represented in the following figure?

Star topology

Star bus

Ad hoc

Infrastructure

The infrastructure wireless topology is commonly used to extend a wired LAN to include wireless devices. Wireless devices communicate with the wired LAN through a base station known as an access point (AP) or wireless access point. The AP forms a bridge between a wireless and wired LAN, and all transmissions between wireless stations or between a system and a wired network client go through the AP.

Explanation

The infrastructure wireless topology is commonly used to extend a wired LAN to include wireless devices. Wireless devices communicate with the wired LAN through a base station known as an access point (AP) or wireless access point. The AP forms a bridge between a wireless and wired LAN, and all transmissions between wireless stations or between a system and a wired network client go through the AP.

64. Your company currently uses a standard PSTN communication link to transfer files between LANs. Until now, the transfer speeds have been sufficient for the amount of data that needs to be transferred. Recently, a new application was purchased that requires a minimum transmission speed of 1.5 Mpbs. You have been given the task of finding the most cost-effective solution to accomodate the new application. Which of the following technologies would you use?

T3

X.25

T1

BRI ISDN

A T1 line has a transmission capability of 1.544Mbps and is considerably cheaper than a T3 line. X.25 and BRI ISDN cannot provide the required transmission speed.

Explanation

A T1 line has a transmission capability of 1.544Mbps and is considerably cheaper than a T3 line. X.25 and BRI ISDN cannot provide the required transmission speed.

65. After a technician came out and installed a new wireless router, one of the wired workstations began having problems connecting to the file server. This is only an intermittent problem. Which of the following actions will the technician MOST likely perform to resolve this problem?

Change the router's SSID

Move the router's location

Check user permissions

Check the cable ends

66. Several users on your network are downloading from peer-to-peer networks, tying up bandwidth during peak hours. Which of the following is used to manage network bandwidth?

Load balancer

Load toner

Bandwidth toner

Bandwidth shaper

The term bandwidth shaping describes the mechanisms used to control bandwidth usage on the network. With this, administrators have complete control over who uses bandwidth, for what purpose, and the time of day bandwidth an be used. Bandwidth shaping establishes priorities for data traveling to and from the Internet and within the network.

Explanation

The term bandwidth shaping describes the mechanisms used to control bandwidth usage on the network. With this, administrators have complete control over who uses bandwidth, for what purpose, and the time of day bandwidth an be used. Bandwidth shaping establishes priorities for data traveling to and from the Internet and within the network.

67. Which of the following technologies requires a logical connection between the sending and receiving devices?

Circuit switching

Virtual-circuit packet switching

Message switching

High-density circuit switching

When virtual-circuit switching is used, a logical connection is established between the source and the destination device.

Explanation

When virtual-circuit switching is used, a logical connection is established between the source and the destination device.

68. Which of the following best describes 802.1X?

A port-based access control

A wireless standard specifying 11Mbps data transfer

A wireless standard specifying 54Mbps data transfer

An integrity-based access control

802.1X is an IEEE standard specifying port-based network access control. Port-based network access control uses the physical characteristics of a switched local area network (LAN) infrastructure to authenticate devices attached to a LAN port and to prevent access to that port in cases where the authentication process fails.

Explanation

802.1X is an IEEE standard specifying port-based network access control. Port-based network access control uses the physical characteristics of a switched local area network (LAN) infrastructure to authenticate devices attached to a LAN port and to prevent access to that port in cases where the authentication process fails.

69. Which of the following circuit-switching strategies does ATM use? (Choose the two best answers)

SVC

VCD

PVC

PCV

ATM uses two types of circuit switching—PVC and SVC. VCD and PCV are not the names of switching methods.

Explanation

ATM uses two types of circuit switching—PVC and SVC. VCD and PCV are not the names of switching methods.

Submit

70. Which of the following IP addresses is not from a private address range?

192.168.200.117

172.16.3.204

127.45.112.16

10.27.100.143

The 127.x.x.x network range is reserved for the loopback function. It is not one of the recognized private address ranges. The private address ranges as defined in RFC 1918 are 10.x.x.x, 172.16.x.x to 172.31.x.x, and 192.168.x.x.

Explanation

The 127.x.x.x network range is reserved for the loopback function. It is not one of the recognized private address ranges. The private address ranges as defined in RFC 1918 are 10.x.x.x, 172.16.x.x to 172.31.x.x, and 192.168.x.x.

71. What is the speed of the 16550 UART chip?

921,600 Kbps

430,800 Kbps

115,200 Kbps

9,600 Kbps

1 15,200 Kbps is the speed of the 1 6550 UART chip. Answer A is incorrect because 921,600 Kbps is the speed of the 16750 and 16950 UART chips. Answer B is incorrect because 430,800 Kbps is the speed of the 16650 UART chip. Answer D is incorrect because 9600 Kbps is the speed of the 8250 UART chip.

Explanation

1 15,200 Kbps is the speed of the 1 6550 UART chip. Answer A is incorrect because 921,600 Kbps is the speed of the 16750 and 16950 UART chips. Answer B is incorrect because 430,800 Kbps is the speed of the 16650 UART chip. Answer D is incorrect because 9600 Kbps is the speed of the 8250 UART chip.

72. At which OSI layer does an AP operate?

Network

Physical

Data link

Session

A wireless access point (AP) operates at the data link layer of the OSI model. An example of a network layer device is a router. An example of a physical layer device is a hub. Session layer components normally are software, not hardware.

Explanation

A wireless access point (AP) operates at the data link layer of the OSI model. An example of a network layer device is a router. An example of a physical layer device is a hub. Session layer components normally are software, not hardware.

73. You have a thin coaxial-based Ethernet network and are experiencing performance problems on the network. By using a network performance-monitoring tool, you determine that the network has a large number of collisions. In an effort to reduce the collisions, you decide to install a network bridge. What kind of bridge are you most likely to implement?

Collision bridge

Transparent bridge

Visible bridge

Translational bridge

A transparent bridge can be used to segment a network, reducing the number of collisions and overall network traffic. It is called transparent because the other devices
on the network do not need to be aware of the device and, in fact, operate as if it weren’t there. A translational bridge is used in environments where it is necessary to
translate one data format into another. Such a conversion is unnecessary in this scenario. There is no such thing as a collision bridge or a visible bridge.

Explanation

A transparent bridge can be used to segment a network, reducing the number of collisions and overall network traffic. It is called transparent because the other devices
on the network do not need to be aware of the device and, in fact, operate as if it weren’t there. A translational bridge is used in environments where it is necessary to
translate one data format into another. Such a conversion is unnecessary in this scenario. There is no such thing as a collision bridge or a visible bridge.

74. Your manager asks you to look into some upgrades for your network. The current network is a 10Base2 system, and you have been experiencing numerous cable problems that have been hard to track down. As a result, you have decided to upgrade to a 10BaseT system.

On the networking vendor’s price list are both active and passive hubs. The passive hubs are considerably cheaper than the active ones, and you are tempted to opt for them so that you come in under budget. A colleague advises against the purchase of passive hubs.

What is the primary difference between an active hub and a passive hub?

Passive hubs do not offer any management capabilities

Passive hubs cannot be used in full-duplex mode

Passive hubs do not regenerate the data signal

Passive hubs forward data to all ports on the hub, not just the one for which they are intended

An active hub regenerates the data signal before forwarding it; a passive hub does not. A hub’s management capabilities have nothing to do with its active/passive aspect. Hubs cannot operate in full-duplex mode. Only network switches can perform this function in this context. Answer D describes the function of a switch, not a hub.

Explanation

An active hub regenerates the data signal before forwarding it; a passive hub does not. A hub’s management capabilities have nothing to do with its active/passive aspect. Hubs cannot operate in full-duplex mode. Only network switches can perform this function in this context. Answer D describes the function of a switch, not a hub.

75. Which of the following address types are associated with IPv6? (Choose three)

Broadcast

Multicast

Unicast

Anycast

A key difference between IPv4 and IPv6 is in the address types. IPv6 addressing has three main types of addresses: unicast, multicast, and anycast. IPv4 uses broadcast addressing, but IPv6 doesn’t.

Explanation

A key difference between IPv4 and IPv6 is in the address types. IPv6 addressing has three main types of addresses: unicast, multicast, and anycast. IPv4 uses broadcast addressing, but IPv6 doesn’t.

Submit

76. Which of the following statements are true of ISDN? (Choose the best two answers)

BRI ISDN uses two B+1 D channels

BRI ISDN uses 23 B+1 D channels

PRI ISDN uses two B+1 D channels

PRI ISDN uses 23 B+1 D channels

BRI ISDN uses two B+1 D channels, which are two 64Kbps data channels, and PRI-ISDN uses 23 B+1 D channels. The D channel is 16Kbps for BRI and 64Kbps for PRI.

Explanation

BRI ISDN uses two B+1 D channels, which are two 64Kbps data channels, and PRI-ISDN uses 23 B+1 D channels. The D channel is 16Kbps for BRI and 64Kbps for PRI.

Submit

77. You are troubleshooting a network using 1000BaseCX cable and you suspect that the maximum length has been exceeded. What is the maximum length of 1000BaseCX cable?

1,000 meters

100 meters

25 meters

10,000 meters

The 1000BaseCX standard specifies Gigabit Ethernet transfer over Category 5 UTP cable. It uses STP twisted-pair cable and has a 25-meter length restriction.

Explanation

The 1000BaseCX standard specifies Gigabit Ethernet transfer over Category 5 UTP cable. It uses STP twisted-pair cable and has a 25-meter length restriction.

78. You are asked to configure the security settings for a new wireless network. You want the setting that offers the greatest level of security. Which of the following would you choose?

WEP-Open

WEP-Closed

WEP-Shared

WEP-Unshared

Both WEP-Open and WEP-Shared are forms of wireless security. WEP-Open is the simpler of the two authentication methods because it does not perform any type of client verification. It is a very weak form of authentication, because no proof of identity is required. WEP-Shared requires that a WEP key be configured on both the client system and the access point. This makes authentication with WEP-Shared mandatory and therefore more secure for wireless transmission.

Explanation

Both WEP-Open and WEP-Shared are forms of wireless security. WEP-Open is the simpler of the two authentication methods because it does not perform any type of client verification. It is a very weak form of authentication, because no proof of identity is required. WEP-Shared requires that a WEP key be configured on both the client system and the access point. This makes authentication with WEP-Shared mandatory and therefore more secure for wireless transmission.

79. In the 802.1X security framework, which of the following best describes the role of the supplicant?

Authenticating user names and passwords

Encrypting usernames and passwords

The system or node requesting access and authentication to a network resource

A control mechanism that allows or denies traffic that wants to pass through a port

The 802.1X security framework has three main components. The supplicant is the system or node requesting access and authentication to a network resource. The authenticator usually is a switch or AP that acts as a control mechanism, allowing or denying traffic that wants to pass through a port. Finally, the authentication server validates the credentials of the supplicant that is trying to access the network or resource.

Explanation

The 802.1X security framework has three main components. The supplicant is the system or node requesting access and authentication to a network resource. The authenticator usually is a switch or AP that acts as a control mechanism, allowing or denying traffic that wants to pass through a port. Finally, the authentication server validates the credentials of the supplicant that is trying to access the network or resource.

80. On an ISDN connection, what is the purpose of the D channel?

It carries the data signals

It carries signaling information

It allows multiple channels to be combined, to provide greater bandwidth

It provides a temporary overflow capacity for the other channels

The D channel on an ISDN link carries signaling information, whereas the B, or bearer, channels carry the data.

Explanation

The D channel on an ISDN link carries signaling information, whereas the B, or bearer, channels carry the data.

81. Which of the following uses PKI?

Blowfish

AES

PGP

3DES

82. You configure a wireless connection using the Bluetooth standard. At what speed does Bluetooth operate?

350 Mbps

720 Kbps

200 Kbps

11 Mbps

Bluetooth is a wireless standard commonly used to interconnect peripheral devices to the computer system. Bluetooth operates at 720Kbps.

Explanation

Bluetooth is a wireless standard commonly used to interconnect peripheral devices to the computer system. Bluetooth operates at 720Kbps.

83. Which of the following statements best describes a gateway?

It is a device that enables data to be routed from one network to another

It refers to any device that resides at the entrance of a network

It is a device, system or application that translates data from one format into another

It is a network device that can forward or block data based on the MAC address embedded in the packet

A gateway can be a device, system, or application that translates data from one format into another. Answers A and B more closely describe a router. Answer D describes
a bridge. A bridge is a device that is used to segregate a network. It makes forwarding or blocking decisions based on the MAC address embedded in the packet.

Explanation

A gateway can be a device, system, or application that translates data from one format into another. Answers A and B more closely describe a router. Answer D describes
a bridge. A bridge is a device that is used to segregate a network. It makes forwarding or blocking decisions based on the MAC address embedded in the packet.

84. Due to recent cutbacks, your boss approaches you, demanding an alternative to the company's costly dedicated T1 line. Only small amounts of data will require transfer over the line. Which of the following are you likely to recommend?

ISDN

FDDI

The PSTN

X.25

When very little traffic will be sent over a line, the PSTN is the most cost-effective solution, although it is limited to 56Kbps. All the other WAN connectivity methods accommodate large amounts of data and are expensive compared to the PSTN.

Explanation

When very little traffic will be sent over a line, the PSTN is the most cost-effective solution, although it is limited to 56Kbps. All the other WAN connectivity methods accommodate large amounts of data and are expensive compared to the PSTN.

85. Which of the following OSI layers is responsible for establishing connections between two devices?

Network

Transport

Session

Data link

The transport layer is responsible for establishing a connection between networked devices. The network layer is most commonly associated with route discovery and datagram delivery. Protocols at the session layer synchronize the data exchange between applications on separate devices. Protocols at the data link layer perform error detection and handling for the transmitted signals and define the method by which the medium is accessed.

Explanation

The transport layer is responsible for establishing a connection between networked devices. The network layer is most commonly associated with route discovery and datagram delivery. Protocols at the session layer synchronize the data exchange between applications on separate devices. Protocols at the data link layer perform error detection and handling for the transmitted signals and define the method by which the medium is accessed.