CompTIA Network+ Practice Exam 2 (72 Questions)

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CompTIA Network+ Practice Exam 2 (72 Questions) - Quiz

72 Question CompTIA Network+ Practice Test


Questions and Answers
  • 1. 

    You suspect that someone is capturing the data sent on your network. You want to capture data to ensure that it is encrypted and cannot be read by intruders. Which of the following network utilities can both intruders and administrators use to capture network traffic?

    • A.

      Port scanner

    • B.

      Packet filter

    • C.

      Data watcher

    • D.

      Packet sniffer

    Correct Answer
    D. Packet sniffer
    Explanation
    Both administrators and hackers use packet sniffers on networks to capture network data. They are either a hardware device or software and eavesdrop on network transmissions that are traveling throughout the network. The packet sniffer quietly captures data and saves it to be reviewed later. Answer A is incorrect because port scanners monitor traffic into and out of ports such as those connected to a switch. Answers B and C are not valid traffic-monitoring technologies.

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  • 2. 

    You have been hired to review the security of a company’s network. Upon investigation, you notice that a wireless AP has been installed in a wiring closet without the consent of the administrator. The AP is actively used by remote users to access resources on the company’s network. Which security problem does this represent?

    • A.

      Rogue protocol interception

    • B.

      Rogue AP

    • C.

      Network sniffing

    • D.

      Social engineering

    Correct Answer
    B. Rogue AP
    Explanation
    A rogue access point describes a situation in which a wireless access point has been placed on a network without the administrator’s knowledge. The result is that it is possible to remotely access the rogue access point, because it likely does not adhere to company security policies. Answers A and C are not valid security risk types. Answer D is a type of attack that involves tricking people into performing actions or divulging confidential information such as passwords or usernames.

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  • 3. 

    You have been employed by a small company to implement a fault-tolerant hard disk configuration. You have purchased four 40GB hard disks, and you plan to install RAID 5 on the server. What is the storage capacity of the RAID solution?

    • A.

      120 GB

    • B.

      40 GB

    • C.

      80 GB

    • D.

      160 GB

    Correct Answer
    A. 120 GB
    Explanation
    RAID 5 reserves the equivalent space of one disk in the array for parity information. The parity information is used to rebuild the data in the event of a hard disk crash. This scenario has four 40GB hard disks. With one reserved for parity, you have 160GB total space; with 40GB removed for parity, there is 120GB of actual data storage.

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  • 4. 

    You have been called in to troubleshoot a small network. The network uses TCP/IP and statically assigned IP information. You add a new workstation to the network. It can connect to the local network but not to a server on a remote network. Which of the following is most likely the cause of the problem?

    • A.

      Incorrect IP address

    • B.

      Incorrect default gateway

    • C.

      The DHCP server is unavailable

    • D.

      Duplicate IP addresses are being used

    Correct Answer
    B. Incorrect default gateway
    Explanation
    To connect to systems on a remote network, the default gateway address has to be correctly assigned. If this address is entered manually, the number might have been entered incorrectly. Because the system can connect to the local network, the address is correctly assigned. Answer C is incorrect because IP addresses are statically assigned. Answer D is incorrect because duplicate addresses will prevent the system from being able to log on to the network.

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  • 5. 

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

    • A.

      When channel overlap occurs between access points

    • B.

      To release and renew the SSID

    • C.

      To increase the WEP security settings

    • D.

      To decrease the WEP security settings

    Correct Answer
    A. When channel overlap occurs between access points
    Explanation
    Ordinarily the default channel used with a wireless device is adequate. However, it may be necessary to change the channel if overlap with another nearby access point occurs. The channel should be changed to another, nonoverlapping channel. Changing the channel would not impact the WEP security settings.

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  • 6. 

    On several occasions your wireless router has been compromised and intruders are logging onto it. Which of the following strategies could you use to increase the security of the wireless routers? (choose the two best answers)

    • A.

      Use SSL

    • B.

      Disable SSID broadcast

    • C.

      Use MAC filtering

    • D.

      Use wireless filtering

    Correct Answer(s)
    B. Disable SSID broadcast
    C. Use MAC filtering
    Explanation
    Administrators can take several security steps to help secure a wireless access point. This includes disabling the SSID broadcast. This makes it more difficult for intruders to get the name of your wireless network. MAC filtering is used to accept or deny client systems based on their MAC address. MAC filtering is an example of an access control list (ACL). Answer A is incorrect because SSL is a security protocol used to increase data transmission security. Answer D is incorrect because wireless filtering is not a valid security measure.

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  • 7. 

    You have just purchased 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?

    • A.

      All client systems must be set to 128-bit encryption

    • B.

      The client system inherits security settings from the AP

    • C.

      WEP does not support 128-bit encryption

    • D.

      The client WEP settings have to be set to autodetect

    Correct Answer
    A. All client systems must be set to 128-bit encryption
    Explanation
    On a wireless connection between an access point and the client, each system must be configured to use the same settings, which includes the SSID, and security settings including WEP. In this question, both the client and the AP must be configured to use 128-bit encryption. Answer B is incorrect because the client does not inherit the information from the AP. Answer C is incorrect because WEP supports 128-bit encryption. Answer D is incorrect because WEP does not have an autodetect feature.

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  • 8. 

    Which of the following topology types offers the greatest amount of redundancy?

    • A.

      Star

    • B.

      Bus

    • C.

      Ring

    • D.

      Mesh

    Correct Answer
    D. Mesh
    Explanation
    In a mesh topology, each device is connected directly to every other device on the network. Such a structure requires that each device have at least two network connections. Answers A, B, and C do not offer the same level of redundancy as a mesh topology.

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  • 9. 

    You need to install a network printer, and you require the printer’s MAC address to finish the installation. Which of the following is a valid MAC address?

    • A.

      192.168.2.13

    • B.

      0x00007856

    • C.

      00:04:e2:1c:7b:5a

    • D.

      56g78:00h6:1415

    Correct Answer
    C. 00:04:e2:1c:7b:5a
    Explanation
    A MAC address contains six hexadecimal number sets. The first three sets represent the manufacturer’s code, whereas the last three identify the unique station ID. Answer A is incorrect because the number is a valid internal IP address. Answers B and D are not valid MAC addresses.

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  • 10. 

    You have been called in to replace a faulty ST connector. Which of the following media types are you working with?

    • A.

      RG-58

    • B.

      RG-62

    • C.

      Single-mode fiber

    • D.

      SCSI

    Correct Answer
    C. Single-mode fiber
    Explanation
    ST connectors are a twist-type connector used with single-mode fiber. Answer A is incorrect because RG-58 (thin coax) uses BNC-type connectors. Answer B is incorrect because RG-62 (thick coax) uses vampire-type AUI connectors. Answer D is incorrect because SCSI cables use a variety of connector types, none of which include ST connectors.

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  • 11. 

    Your manager asks you to recommend a secure way to copy files between a server on your network and a remote server in another location. Which of the following solutions are you most likely to recommend?

    • A.

      TFTP

    • B.

      FTP

    • C.

      SFTP

    • D.

      IGMP

    Correct Answer
    C. SFTP
    Explanation
    Secure File Transfer Protocol (SFTP) allows you to securely copy files from one location to another. SFTP provides authentication and encryption capabilities to safeguard data. Answer A is incorrect because TFTP is a mechanism that provides file-transfer capabilities, but it does not provide security. Answer B is incorrect because FTP provides basic authentication mechanisms, but it does not provide encryption. Answer D is incorrect because IGMP is a protocol associated with multicast group communications. It is not a file transfer protocol.

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  • 12. 

    You are setting up a wide area network between two school campuses, and you decide to use BRI ISDN. What is the maximum throughput of your connection?

    • A.

      64 Kbps

    • B.

      128 Kbps

    • C.

      128 Mbps

    • D.

      64 Mbps

    Correct Answer
    B. 128 Kbps
    Explanation
    BRI ISDN uses two 64-Kbps data channels. Combined, BRI ISDN offers a 128-Kbps transfer rate.

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  • 13. 

    You are troubleshooting a 100BaseT network, and you suspect that the maximum cable length has been exceeded. What is the maximum length of a 100BaseT network segment?

    • A.

      25 meters

    • B.

      100 meters

    • C.

      185 meters

    • D.

      500 meters

    Correct Answer
    B. 100 meters
    Explanation
    100BaseT is an Ethernet network standard implemented using thin twisted-pair cable. The maximum length of a segment is 100 meters. When cable is run beyond 100 meters, repeaters can be used to regenerate the signal for longer transmission distances.

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  • 14. 

    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?

    • A.

      WEP-open

    • B.

      WEP-closed

    • C.

      WEP-shared

    • D.

      WEP-unshared

    Correct Answer
    C. WEP-shared
    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 it requires no proof of identity. 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. Answers B and D are not valid WEP options.

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  • 15. 

    What is the maximum cable length of a 10BaseT network?

    • A.

      185 meters

    • B.

      500 meters

    • C.

      100 meters

    • D.

      50 meters

    Correct Answer
    C. 100 meters
    Explanation
    10BaseT networks use UTP media, which have a maximum distance of 100 meters. Answer A is incorrect because 185 meters is the distance limitation of thin coax media used on 10Base2 networks. Answer B is incorrect because 500 meters is the distance limitation of thick coaxial media used with 10Base5 networks. Answer D is incorrect because 50 meters is not a valid cable distance.

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  • 16. 

    While troubleshooting a DNS issue from a UNIX server, you suspect that the DNS record for one of your other servers is incorrect. Which of the following utilities are you most likely to use to troubleshoot this problem?

    • A.

      Ipconfig

    • B.

      Dig

    • C.

      Netstat

    • D.

      Nbtstat

    Correct Answer
    B. Dig
    Explanation
    The dig command is used on UNIX and Linux systems to perform manual name resolutions against a DNS server. This can be useful in troubleshooting DNS-related issues. The ipconfig, netstat, and nbtstat commands are all Windows-based commands, so they would not be used in this scenario.

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  • 17. 

    A number of users have called to report printing problems. Upon investigation, you trace the problem to a network printer connected to a server system. You arrive at the printer to find that it is connected online and appears to perform a test print without any problems. You check the network connectivity, and that seems to be okay as well. Which troubleshooting step would you perform next?

    • A.

      Examine the log files on the server to determine whether any printing-related events have occurred

    • B.

      Reboot the server that acts as the print server

    • C.

      Remove and reinstall the printer drivers

    • D.

      Change the network cable that connects the printer to the network

    Correct Answer
    A. Examine the log files on the server to determine whether any printing-related events have occurred
    Explanation
    Log files often record information about errors that can be vital to the troubleshooting process. Answer B is incorrect because rebooting the server is a last-resort troubleshooting step. Answer C is incorrect because although removing and reinstalling the printer drivers might be a valid step, it would not be the first choice of those listed. Changing the network cable might be a valid troubleshooting step, but because it has been verified that the network connectivity is working, this should not be necessary.

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  • 18. 

    You are experiencing problems with the network connectivity of a Windows Vista system. You suspect that there might be a problem with an incorrect route in the routing table. Which of the following TCP/IP utilities can you use to view the routing table? (choose two)

    • A.

      Tracert

    • B.

      Nbstat

    • C.

      Route

    • D.

      Netstat

    • E.

      Ping

    Correct Answer(s)
    C. Route
    D. Netstat
    Explanation
    Both the route and netstat commands can be used to view the routing table on a Windows Vista system. Answer A is incorrect because the tracert utility is used to track the route a packet takes between two destinations. Answer B is incorrect because the nbtstat command is used to view statistical information for NetBIOS connections. Answer E is incorrect because the ping utility is used to test network connectivity.

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  • 19. 

    Which of the following best describes the function of asymmetric key encryption?

    • A.

      It uses both a private and public key to encrypt and decrypt messages

    • B.

      It uses two private keys to encrypt and decrypt messages

    • C.

      It uses a single key for both encryption and decryption

    • D.

      It uses three separate keys for both encryption and decryption

    Correct Answer
    A. It uses both a private and public key to encrypt and decrypt messages
    Explanation
    Asymmetric key encryption uses both a private and public key to encrypt and decrypt messages. The public key is used to encrypt a message or verify a signature, and the private key is used to decrypt the message or sign a document. In a symmetric key encryption strategy, a single key is used for both encryption and decryption. None of the other answers represents asymmetric key encryption.

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  • 20. 

    Which of the following services provides name resolution services for FQDNs?

    • A.

      DNS

    • B.

      DHCP

    • C.

      WINS

    • D.

      ARP

    • E.

      NTP

    Correct Answer
    A. DNS
    Explanation
    The Domain Name System (DNS) resolves Fully Qualified Domain Names (FQDNs) to IP addresses. Answer B is incorrect because Dynamic Host Configuration Protocol (DHCP) provides automatic IP address assignment. Answer C is incorrect because the Windows Internet Naming Service (WINS) provides NetBIOS computer name to IP address resolution. Answer D is incorrect because Address Resolution Protocol (ARP) resolves IP addresses to MAC addresses. Answer E is incorrect because Network Time Protocol (NTP) facilitates the communication of time information between systems.

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  • 21. 

    You are installing a 100BaseFX network, and you need to purchase connectors. Which of the following might you purchase? (choose two)

    • A.

      RJ-45

    • B.

      ST

    • C.

      BNC

    • D.

      SC

    Correct Answer(s)
    B. ST
    D. SC
    Explanation
    100BaseFX networks use fiber media, which can use either SC or ST connectors. Answer A is incorrect because RJ-45 connectors are used with UTP media. Answer C is incorrect because BNC connectors are used with thin coax media on 10Base2 networks.

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  • 22. 

    To increase wireless network security, you have decided to implement port-based security. Which of the following standards specifies port-based access control?

    • A.

      802.11x

    • B.

      802.1x

    • C.

      802.11b

    • D.

      802.1b

    Correct Answer
    B. 802.1x
    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. Answer A is incorrect because 802.11x is not a security standard but sometimes is used to refer to all wireless network standards, such as 802.11b/g/a/n. Answer C, 802.11b, is an actual wireless standard specifying transmission speeds of 11Mbps.

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  • 23. 

    When designing a network, you have been asked to select a cable that offers the most resistance to crosstalk. Which of the following are you likely to choose?

    • A.

      Multimode fiber-optic

    • B.

      Shielded twisted pair

    • C.

      UTP

    • D.

      Shielded mesh

    Correct Answer
    A. Multimode fiber-optic
    Explanation
    Unlike copper-based media, fiber-optic media is resistant to crosstalk, because it uses light transmissions. Answer B is incorrect because STP offers greater resistance to crosstalk than regular UTP but is not as resistant as fiber-optic cable. Answer C is incorrect because UTP cable is more susceptible to crosstalk than either STP or fiber-optic. Answer D is incorrect because shielded mesh is not a type of cable.

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  • 24. 

    Which of the following are considered disaster recovery measures? (choose two)

    • A.

      Backups

    • B.

      UPS

    • C.

      RAID5

    • D.

      Offsite data storage

    Correct Answer(s)
    A. Backups
    D. Offsite data storage
    Explanation
    Both backups and offsite data storage are considered disaster recovery measures. Answer B is incorrect because a UPS is considered a fault-tolerance measure, not a disaster recovery measure. Answer C is incorrect because RAID 5 is considered a fault-tolerance measure, not a disaster recovery measure.

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  • 25. 

    Which command produces the following output? 

    • A.

      Arp

    • B.

      Tracert

    • C.

      Ipconfig

    • D.

      Netinf

    Correct Answer
    A. Arp
    Explanation
    The output is from the arp -a command, which shows information related to IP address-to-MAC address resolutions. Answer B is incorrect because the tracert command displays the route a packet takes between two points. Answer C is incorrect because the ipconfig command displays a system’s network configuration. Answer D is incorrect because there is no such command as netinf.

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  • 26. 

    You are working with a wireless network that is using channel 1 (2412 MHz). What RF range would be used if you switched to channel 3?

    • A.

      2417

    • B.

      2422

    • C.

      2427

    • D.

      2408

    Correct Answer
    B. 2422
    Explanation
    IEEE 802.11g/b wireless systems communicate with each other using radio frequency signals in the band between 2.4GHz and 2.5GHz. Neighboring channels are 5MHz apart. Therefore, channel 3 would use the 2422 RF (2412+5+5).

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  • 27. 

    Because of a recent security breach, you have been asked to design a security strategy that will allow data to travel encrypted through both the Internet and intranet. Which of the following protocols would you use?

    • A.

      IPSec

    • B.

      SST

    • C.

      CHAP

    • D.

      FTP

    Correct Answer
    A. IPSec
    Explanation
    IPSec is a nonproprietary security standard used to secure transmissions both on the internal network and when data is sent outside the local LAN. IPSec provides encryption and authentication services for data communications. Answer B is not a valid protocol. Answer C, CHAP, is a remote-access authentication protocol. Answer D is incorrect because FTP is a protocol used for large data transfers, typically from the Internet.

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  • 28. 

    As part of a network upgrade, you have installed a router on your network, creating two networks. Now, workstations on one side of the router cannot access workstations on the other side. Which of the following configuration changes would you need to make to the workstations to enable them to see devices on the other network? (choose two)

    • A.

      Change the IP address assignments on one side of the router so that the router is on a different IP network from the other one

    • B.

      Update the default gateway information on all systems so that they use the newly installed router as the gateway

    • C.

      Update the default gateway information on all systems so that they use a workstation on the other network as the default gateway

    • D.

      Make sure that the IP address assignments on all network workstations are the same

    Correct Answer(s)
    A. Change the IP address assignments on one side of the router so that the router is on a different IP network from the other one
    B. Update the default gateway information on all systems so that they use the newly installed router as the gateway
    Explanation
    The devices on one side of the router need to be configured with a different IP network address than when the network was a single segment. Also, the default gateway information on all systems needs to be updated to use the newly installed router as the default gateway. Answer C is incorrect because the default gateway address should be the address of the router, not another workstation on the network. Answer D is incorrect because for systems to communicate on an IP network, all devices must be assigned a unique IP address. Assigning systems the same address would cause address conflicts, thus keeping the systems from communicating.

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  • 29. 

    Which type of cable should be used in a 100BaseT network?

    • A.

      RG-58

    • B.

      Category 4 UTP

    • C.

      Category 5 UTP

    • D.

      Multimode fiber

    Correct Answer
    C. Category 5 UTP
    Explanation
    100BaseT is implemented using a minimum of Category 5 UTP cable. Answer A is incorrect because RG-58 is a type of coaxial cable with a maximum speed of 10Mbps. Answer B is incorrect because Category 4 UTP cable is not intended for use on a 100BaseT network. Answer D is incorrect because multimode fiber is used in fiber-optic networks. The 100BaseT standard defines 100Mbps networking using UTP cable.

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  • 30. 

    Which of the following network types is easiest to add new nodes to?

    • A.

      Bus

    • B.

      Ring

    • C.

      Star

    • D.

      Mesh

    Correct Answer
    C. Star
    Explanation
    Each node on a star network uses its own cable, which makes it easy to add users without disrupting current ones. Adding a node to a bus network can sometimes involve breaking the segment, which makes it inaccessible to all other nodes on the network. This makes answer A incorrect. Answer B is incorrect because a true ring network model would require that the ring be broken to add a new device. Answer D is incorrect because a mesh topology requires that every device be connected to every other device on the network. Therefore, it is quite difficult to expand a mesh network.

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  • 31. 

    You are troubleshooting a network connectivity error, and you need to issue a continuous ping command. Which of the following switches is used with ping to send a continuous ping message?

    • A.

      -p

    • B.

      -t

    • C.

      -c

    • D.

      -r

    Correct Answer
    B. -t
    Explanation
    The ping -t command issues a continuous stream of ping requests until it is interrupted. A regular ping sends four requests, but sometimes this is not enough to troubleshoot a connectivity issue. None of the other answers are valid switches for a continuous ping command.

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  • 32. 

    You recently installed a DHCP server to replace static IP addressing. You configure all client systems to use DHCP and then reboot each system. After they are rebooted, they all have an IP address in the 169.254.0.0 range. Which of the following statements is true?

    • A.

      The DHCP server has been configured to assign addresses in the 169.254.0.0 IP range

    • B.

      The DHCP server must be rebooted

    • C.

      Client systems are unable to access the new DHCP server

    • D.

      Client systems are getting IP address information from the HOSTS file

    Correct Answer
    C. Client systems are unable to access the new DHCP server
    Explanation
    When a client system first boots up, it looks for a DHCP server. If the server cannot be found, Automatic Private IP Addressing (APIPA) automatically assigns IP addresses to the client systems. The addresses are not routable and cannot be used to access remote segments. The addresses assigned are in the 169.254.0.0 address range. All clients configured with valid APIPA address will be able to communicate with each other.

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  • 33. 

    Placing a node on which of the following types of networks would require that you obtain an address from IANA?

    • A.

      Private network

    • B.

      Public network

    • C.

      Ethernet network

    • D.

      LAN

    Correct Answer
    B. Public network
    Explanation
    The Internet Assigned Numbers Authority (IANA) manages the address assignments for public networks such as the Internet. Answers A and D are incorrect because on a private network or LAN, you can use any internal IP addressing scheme that is compatible with your local network. Answer C is incorrect because an Ethernet network can be either private or public. It does not directly need an IANA assigned addressing scheme.

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  • 34. 

    You are implementing a new network. From the network specifications, you learn that you will be using the 1000BaseCX standard. What type of cable will you use?

    • A.

      Multimode fiber

    • B.

      STP

    • C.

      Single-mode fiber

    • D.

      CoreXtended fiber

    Correct Answer
    B. STP
    Explanation
    The 1000BaseCX standard specifies Gigabit Ethernet over STP cabling. Answer A is incorrect because 1000BaseSX and 1000BaseLX specify Gigabit Ethernet over two types of multimode fiber. Answer C is incorrect because single-mode fiber-optic cable is used with the 100BaseFX standard. Answer D is incorrect because there is no such thing as CoreXtended fiber-optic cable.

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  • 35. 

    Which of the following network protocols can recover from lost or corrupted packets in a network transmission?

    • A.

      L2TP

    • B.

      TCP

    • C.

      FTP

    • D.

      ARP

    Correct Answer
    B. TCP
    Explanation
    TCP is a connection-oriented protocol, so it can recover from failed transmissions. Answer A is incorrect because L2TP is used in remote-access connections. Answer C is incorrect because FTP is a connectionless file transfer protocol and cannot recover from lost packets. Answer D is incorrect because ARP is part of the TCP/IP protocol suite that resolves IP addresses to MAC addresses.

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  • 36. 

    Your colleague decides to close all unused ports on the corporate firewall to further secure the network from intruders. The open ports are 25, 80, 110, and 53. Your colleague knows that ports 25 and 110 are required for email and that port 80 is used for nonsecure web browsing, so he decides to close port 53, because he doesn’t think it is necessary. Which network service is now unavailable?

    • A.

      Secure HTTP

    • B.

      FTP

    • C.

      Telnet

    • D.

      DNS

    Correct Answer
    D. DNS
    Explanation
    The DNS service uses port 53. If this port is accidentally blocked, the DNS service will be unavailable. Answer A is incorrect because secure HTTP uses port 443. Answer B is incorrect because FTP uses port 21. Answer C is incorrect because Telnet uses port 23.

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  • 37. 

    You are working on a Linux system, and you suspect that there might be a problem with the TCP/IP configuration. Which of the following commands would you use to view the system’s network card configuration?

    • A.

      Config

    • B.

      Ipconfig

    • C.

      Winipcfg

    • D.

      Ifconfig

    Correct Answer
    D. Ifconfig
    Explanation
    On a Linux system, the ifconfig command shows the network card configuration. Answer A is incorrect because the config command shows the network configuration on a NetWare server. Answer B is incorrect because the ipconfig command shows the network configuration information on a Windows system. Answer C is incorrect because the winipcfg command shows the network configuration information on a certain Windows system, such as Windows 95/98.

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  • 38. 

    You have configured network clients to obtain IP addresses using APIPA. Which of the following IP ranges would be assigned to client systems?

    • A.

      10.10.0.0 to 10.254.254.0

    • B.

      169.168.0.0 to 169.168.255.255

    • C.

      192.168.0.0 to 192.168.254.254

    • D.

      169.254.0.1 to 169.254.255.254

    Correct Answer
    D. 169.254.0.1 to 169.254.255.254
    Explanation
    The Internet Assigned Numbers Authority (IANA) has reserved addresses 169.254.0.1 to 169.254.255.254 for Automatic Private IP Addressing. APIPA uses a Class B address with a subnet mask of 255.255.0.0. None of the other IP address ranges listed are associated with APIPA address ranges.

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  • 39. 

    Your manager asks you to implement a fault-tolerant disk solution on your server. You have two 30GB hard disks and two controllers, so you decide to implement RAID 1. After the installation, your manager asks you how much storage space is now available for storing data. What do you tell her?

    • A.

      30 GB

    • B.

      40 GB

    • C.

      60 GB

    • D.

      120 GB

    Correct Answer
    A. 30 GB
    Explanation
    In a RAID 1 scenario where two controllers are being used (disk duplexing), one disk carries an exact copy of the other. Therefore, the total volume of one disk (30GB in this case) is lost to redundancy.

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  • 40. 

    Which of the following statements best describes PRI ISDN?

    • A.

      PRI ISDN uses 128 B channels and two D channels

    • B.

      PRI ISDN uses 23 B channels and one D channel

    • C.

      PRI ISDN uses two B channels and one D channel

    • D.

      PRI ISDN uses 23 D channels and one B channel

    Correct Answer
    B. PRI ISDN uses 23 B channels and one D channel
    Explanation
    Primary Rate ISDN (PRI) uses 23 B channels to carry data and one D channel to carry signaling information. Answer C is incorrect because it describes Basic Rate ISDN (BRI).

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  • 41. 

    Which of the following media types is used with the 802.3 1000BaseSX standard?

    • A.

      Coaxial

    • B.

      UTP

    • C.

      Single-mode fiber-optic

    • D.

      Multimode fiber-optic

    Correct Answer
    D. Multimode fiber-optic
    Explanation
    The Gigabit Ethernet standard 1000BaseSX specifies multimode fiber-optic cable. 1000BaseSX can be used up to 550 meters. Answers B and C are incorrect because the 1000BaseSX gigabit Ethernet standard does not specify the use of single-mode fiber-optic cable or UTP cabling. Answer A is incorrect because no Gigabit Ethernet standards use coaxial cabling.

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  • 42. 

    What is the name of the bridging method used to segregate Ethernet networks?

    • A.

      Source-route

    • B.

      Invisible

    • C.

      Cut-through

    • D.

      Transparent

    Correct Answer
    D. Transparent
    Explanation
    The bridging method used on Ethernet networks is called transparent because the other network devices are unaware of the existence of the bridge. Source-route bridges are used on Token Ring networks, invisible is not a type of bridge, and cut-through is a switching method, not a type of bridge.

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  • 43. 

    A remote user calls you because he cannot dial in to the remote server. He says that the modem dials the number and negotiates the connection, but then the line is dropped. Which of the following troubleshooting steps are you likely to try first? (choose two)

    • A.

      Change the modem IRQ assignments

    • B.

      Run a remote diagnostic on the remote access server’s modem

    • C.

      Ask the user to verify that the username and password are correct

    • D.

      Ask the user to verify that he is dialing the correct system

    Correct Answer(s)
    C. Ask the user to verify that the username and password are correct
    D. Ask the user to verify that he is dialing the correct system
    Explanation
    In most cases, you should try the simplest solutions first. You should verify information such as the username and password before attempting any reconfiguration. Answer A is incorrect because if the modem is dialing the remote system and getting a response, it is most likely working correctly. Answer B is incorrect because running a remote diagnostic on the modem is a valid troubleshooting step, but you should first verify that the correct connection information is being used.

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  • 44. 

    At which layer of the OSI model does a NIC operate?

    • A.

      Physical

    • B.

      Network

    • C.

      Data link

    • D.

      Transport

    Correct Answer
    C. Data link
    Explanation
    Although it provides the physical connection to the network, a NIC is considered a data link device. Answers A, B, and D are wrong because a NIC is not said to operate at any of these layers.

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  • 45. 

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

    • A.

      802.11a

    • B.

      802.11b

    • C.

      802.11g

    • D.

      802.11n

    Correct Answer
    D. 802.11n
    Explanation
    Multiple input and multiple output (MIMO) is the use of multiple antennas at both the transmitter and receiver to improve communication performance. 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. The wireless standards in answers A, B, and C do not use the MIMO technology.

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  • 46. 

    You are implementing a 100BaseT network. Which logical topology does the network use?

    • A.

      Ring

    • B.

      Star

    • C.

      Mesh

    • D.

      Bus

    Correct Answer
    D. Bus
    Explanation
    The 100BaseT standard defines an Ethernet network using twisted-pair cable, which would be configured in a physical star configuration. However, even in a star configuration, an Ethernet network still uses a logical bus topology.

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  • 47. 

    Which command produces the following output? 

    • A.

      Arp

    • B.

      Netstat

    • C.

      Nbtstat

    • D.

      Tracert

    Correct Answer
    B. Netstat
    Explanation
    The output shown is from the netstat command from a Windows-based system.

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  • 48. 

    Which of the following devices was specifically designed to deal with attenuation? (choose two)

    • A.

      Switch

    • B.

      Passive hub

    • C.

      DHCP server

    • D.

      Repeater

    Correct Answer(s)
    A. Switch
    D. Repeater
    Explanation
    Data signals weaken as they travel down a particular medium. This is known as attenuation. To increase the distance a signal can travel, we can regenerate the data signal to give it more strength. A hardware repeater regenerates the data signal as it passes, allowing it to travel farther. Repeaters typically are no longer standalones device; rather, they are included with the function of a switch. Answers B and C are incorrect because a passive hub and DHCP server are not designed to answer.

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  • 49. 

    You are attempting to troubleshoot a remote connectivity problem for a user. Although the modem seems to be working properly within the computer, you cannot get the modem to dial a number. Working within a terminal software application, you attempt to communicate directly with the modem. From within the terminal application, which command would you issue to reset the modem?

    • A.

      ATD

    • B.

      ATI3

    • C.

      ATZ

    • D.

      ATH

    Correct Answer
    C. ATZ
    Explanation
    The Hayes AT command set provides commands that allow you to communicate directly with the modem. The ATZ command is used to reset the modem. Answer A is incorrect because the ATD command is used to dial a number. Answer B is incorrect because the ATI command is used to retrieve information from the modem. The ATI3 command shows the modem’s manufacturer and model. Answer D is incorrect because the ATH command is used to hang up a connection.

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  • 50. 

    Which of the following protocols maps Layer 2 addresses to Layer 3 addresses on a TCP/IP network?

    • A.

      ARPA

    • B.

      ARP

    • C.

      AARP

    • D.

      RARP

    Correct Answer
    D. RARP
    Explanation
    A Layer 2 address is a MAC address. A Layer 3 address is a software-configured protocol address. Because a normal resolution is considered to be a Layer 3-to-Layer 2 resolution, the resolution the other way is considered a reverse resolution. On a TCP/IP network, such a resolution is performed by Reverse Address Resolution Protocol (RARP). Answer A is incorrect because ARPA is not an address resolution protocol. Answer B is incorrect because Address Resolution Protocol (ARP) resolves Layer 3 addresses to Layer 2 addresses. Answer C is incorrect because AppleTalk Address Resolution Protocol is used, on AppleTalk networks, to resolve AppleTalk addresses to MAC addresses.

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