Assessment Test (Network +)

1. Which RG rating of coax is used for cable modems?

RG-59

RG-58

RG-6

RG-8

RG-6 is the correct answer for the rating of coax used for cable modems. RG-6 is a type of coaxial cable that is commonly used for high-speed internet connections such as cable modems. It has a larger conductor and better shielding compared to RG-59 and RG-58, making it more suitable for transmitting high-frequency signals with less signal loss and interference. RG-8, on the other hand, is a thicker and more heavy-duty coaxial cable that is typically used for long-distance applications such as connecting antennas.

Explanation

RG-6 is the correct answer for the rating of coax used for cable modems. RG-6 is a type of coaxial cable that is commonly used for high-speed internet connections such as cable modems. It has a larger conductor and better shielding compared to RG-59 and RG-58, making it more suitable for transmitting high-frequency signals with less signal loss and interference. RG-8, on the other hand, is a thicker and more heavy-duty coaxial cable that is typically used for long-distance applications such as connecting antennas.

2. Someone calls you and asks for your bank-account number because the bank is having problem with your account. You give them this information and later find out that you were scammed. What type of attack is this?

Phishing

Calling-scam

Analog-scam

Trust-exploration attack

Man-in-the-middle attack

Social engineering or phishing refers to the act of attempting to illegally obtain sensitive information by pretending to be a credible source. Phishing usually takes one of two forms: an email or a phone call. See Chapter 14 for more information.

Explanation

Social engineering or phishing refers to the act of attempting to illegally obtain sensitive information by pretending to be a credible source. Phishing usually takes one of two forms: an email or a phone call. See Chapter 14 for more information.

3. You connected your company to the Internet, and security is a concern. What should you install?

Higher-quality cables

Firewall

DNS

Switches

Firewalls help provide perimeter network security by allowing or denying connections and types of traffic in or out of the network. See Chapter 15 for more information.

Explanation

Firewalls help provide perimeter network security by allowing or denying connections and types of traffic in or out of the network. See Chapter 15 for more information.

4. Which tool is used to attach ends to network cables?

Punch-down tool

Crimper

VLAN tool

Strippers

ARP tool

A wire crimper or crimper is used to attach ends onto different types of network cables. See Chapter 18 for more information.

Explanation

A wire crimper or crimper is used to attach ends onto different types of network cables. See Chapter 18 for more information.

5. You need to connect a hub to a switch. You don't like this idea because you know that it will create congestion. What type of cable do you need to use to connect the hub to the switch?

EtherlP

Crossover

Straight-through

Cable Sense, Multiple Access

To connect two switches together or a hub to a switch, you need a crossover cable. See Chapter 4 for more information

Explanation

To connect two switches together or a hub to a switch, you need a crossover cable. See Chapter 4 for more information

6. You need to break up broadcast domains in a Layer 2 switched network. What strategy will you use?

Implement a loop-avoidance scheme

Create a flatter network structure using switches

Create a VLAN

Disable spanning tree on individual ports

Virtual LANs break up broadcast domains in Layer 2 switched internetworks. See Chapter 11 for more information

Explanation

Virtual LANs break up broadcast domains in Layer 2 switched internetworks. See Chapter 11 for more information

7. IP

Application

Data Link

Network

Physical

. IP is a Network-layer protocol. Internet Explorer is an example of an Application layer protocol; Ethernet is an example of a Data Link—layer protocol; and T1 can be considered a Physical-layer protocol. See Chapter 2 for more information.

Explanation

. IP is a Network-layer protocol. Internet Explorer is an example of an Application layer protocol; Ethernet is an example of a Data Link—layer protocol; and T1 can be considered a Physical-layer protocol. See Chapter 2 for more information.

8. You want your users to log in and authenticate before they can get onto your network.

RADIUS

TACACS+

Virtual Network Computing

Remote desktop protocol

RADIUS combines user authentication and authorization into one profile. See Chapter 13 for more information.

Explanation

RADIUS combines user authentication and authorization into one profile. See Chapter 13 for more information.

9. If you are running half-duplex Internet, which of the following is true. (Choose all that apply)?

Your digital signal cannot transmit and receive data at the same time.

Hosts use the CSMA/CD protocol to prevent collisions.

The physical connection consists of one wire pair.

All of the above

A, B, and C are true. With half-duplex, you are using one wire pair with a digital signal either transmitting or receiving (but not both at once). Carrier Sense Multiple Access with Collision Detection (CSMA/CD) helps packets that are transmitted simultaneously from different hosts share bandwidth evenly. See Chapter 4 for more information

Explanation

A, B, and C are true. With half-duplex, you are using one wire pair with a digital signal either transmitting or receiving (but not both at once). Carrier Sense Multiple Access with Collision Detection (CSMA/CD) helps packets that are transmitted simultaneously from different hosts share bandwidth evenly. See Chapter 4 for more information

10. 1. What is the basic purpose of a local area network (LAN)?

To interconnect networks in several different buildings

To connect one or more computers together so they can share resources

To interconnect 2 to 10 routers

To make routers unnecessary

LANs generally have a geographic scope of a single building or smaller. They can be simple (two hosts) to complex (with thousands of hosts). See Chapter 1 for more information.

Explanation

LANs generally have a geographic scope of a single building or smaller. They can be simple (two hosts) to complex (with thousands of hosts). See Chapter 1 for more information.

11. The OSI model uses an encapsulation method to describe the data as it is encapsulated at each layer of the OSI. What is the encapsulation named at the Data Link layer?

Bits

Packets

Frames

Data

Segments

The Data Link layer is responsible for encapsulating IP packets into frames and for providing logical network addresses. See Chapter 9 for more information

Explanation

The Data Link layer is responsible for encapsulating IP packets into frames and for providing logical network addresses. See Chapter 9 for more information

12. HTTP, FTP, and Telnet work at which layer of the OSI model?

Application

Presentation

Session

Transport

. HTTP, FTP and Telnet use TCP at the Transport layer; however, they are all Application- layer protocols, so the Application layer is the best answer for this question. See Chapter 6 for more information

Explanation

. HTTP, FTP and Telnet use TCP at the Transport layer; however, they are all Application- layer protocols, so the Application layer is the best answer for this question. See Chapter 6 for more information

13. Which of the following describes a VLAN?

It is a device that provides IP addresses to hosts.

It uses firewalls.

It virtually separates subnets using switches.

It virtually separates subnets using routers.

Virtual LANs (VLANs) separate subnets (Layer 3 networks) using switches instead of routers. See Chapter 1 for more information.

Explanation

Virtual LANs (VLANs) separate subnets (Layer 3 networks) using switches instead of routers. See Chapter 1 for more information.

14. IPSec is defined at what layer of the OSI model?

Network

Physical

Layer 4

Layer 7

IPSec works at the Network layer of the OSI model (Layer 3) and secures all applica-tions that operate above it (Layer 4 and above). Additionally, because it was designed by the IETF and designed to work with IPv4 and IPv6, it has broad industry support and is quickly becoming the standard for VPNs on the Internet. See Chapter 13 for more information.

Explanation

IPSec works at the Network layer of the OSI model (Layer 3) and secures all applica-tions that operate above it (Layer 4 and above). Additionally, because it was designed by the IETF and designed to work with IPv4 and IPv6, it has broad industry support and is quickly becoming the standard for VPNs on the Internet. See Chapter 13 for more information.

15. Layer 2 of the OSI model is named

A. Application layer

B. Network layer

C. Transport layer

D. Data Link layer

. Layer 2 of the OSI model is the Data Link layer, which provides the physical transmis¬sion of the data and handles error notification, network topology, and flow control. See Chapter 2 for more information.

Explanation

. Layer 2 of the OSI model is the Data Link layer, which provides the physical transmis¬sion of the data and handles error notification, network topology, and flow control. See Chapter 2 for more information.

16. What is the subnetwork address for a host with the IP address 200.10.5.168/28?

200.10.5.156

200.10.5.132

200.10.5.160

200.10.5.0

200.10.5.255

This is a pretty simple question. A /28 is 255.255.255.240, which means that our block size is 16 in the fourth octet. 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, and so on. The host is in the 1604 subnet. See Chapter 8 for more information.

Explanation

This is a pretty simple question. A /28 is 255.255.255.240, which means that our block size is 16 in the fourth octet. 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, and so on. The host is in the 1604 subnet. See Chapter 8 for more information.

17.

Ping 127.0.0.0

Ping 127.0.0.1

Telnet 1.0.0.127

Ping 127.0.0.255

Telnet 255.255.255.255

To test the local stack on your host, ping the loopback interface of 127.0.0.1. See Chapter 8 for more information.

Explanation

To test the local stack on your host, ping the loopback interface of 127.0.0.1. See Chapter 8 for more information.

18. Most Application-layer protocols only use UDP or TCP at the Transport layer. Which of the following could use both?

TCP

Microsoft Word

Telnet

DNS

DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address. See Chapter 6 for more information.

Explanation

DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address. See Chapter 6 for more information.

19. Which device would connect network segments together, creating separate collision

Hub

Router

Switch

Modem

C. A switch creates separate collision domains for each port but does not break up broad¬cast domains by default. See Chapter 5 for more information.

Explanation

C. A switch creates separate collision domains for each port but does not break up broad¬cast domains by default. See Chapter 5 for more information.

20. The rate at which the frame-relay switch agrees to transfer data is referred to as _____.

BE

FECN

CIR

BECN

The Committed Information Rate (CIR) is the rate, in bits per second, at which the frame-relay switch agrees to transfer data. See Chapter 16 for more information.

Explanation

The Committed Information Rate (CIR) is the rate, in bits per second, at which the frame-relay switch agrees to transfer data. See Chapter 16 for more information.

21. Why do most switches run the Spanning Tree Protocol by default?

It monitors how the network is functioning.

It stops data from forwarding until all devices are updated.

It prevents switching loops.

It manages the VLAN database

The Spanning Tree Protocol (STP) was designed to stop Layer 2 loops. All enterprise model switches have STP by default. See Chapter 11 for more information.

Explanation

The Spanning Tree Protocol (STP) was designed to stop Layer 2 loops. All enterprise model switches have STP by default. See Chapter 11 for more information.

22. Where does a Data Link layer frame have to carry a Network layer packet if the packet is

Router

Physical medium

Switch

Another host

Packets specifically have to be carried to a router in order to be routed through a network. See Chapter 9 for more information.

Explanation

Packets specifically have to be carried to a router in order to be routed through a network. See Chapter 9 for more information.

23. Which of the following describes MIMO correctly?

A protocol that requires acknowledgment of each and every frame

A modulation technique that allows more than one data rate

A technique that packs smaller packets into a single unit, which improves throughput

Part of the 802.11n wireless standard, MIMO sends multiple frames by several antennae over several paths; they are then recombined by another set of antennae to optimize through¬put and multipath resistance. This is called spatial multiplexing. See Chapter 12 for more information.

Explanation

Part of the 802.11n wireless standard, MIMO sends multiple frames by several antennae over several paths; they are then recombined by another set of antennae to optimize through¬put and multipath resistance. This is called spatial multiplexing. See Chapter 12 for more information.

24. Your boss asks you why you just put in a requisition to buy a bunch of switches. He said he just bought you a bunch of hubs five years ago! Why did you buy the switches?

Because each switch port is its own collision domain.

The cable connecting devices to the hub wore out, and switches were cheaper than new cable.

There were too many broadcast domains, and a switch breaks up broadcast domains by default.

The hubs kept repeating signals but quit recognizing frames and data structures.

A. For the most part, switches are not cheap; however, one of the biggest benefits of using switches instead of hubs in your internetwork is that each switch port is actually its own collision domain. A hub creates one large collision domain. Switches still can't break up broadcast domains (do you remember which devices do?). Hubs do not recognize frames and data structures but switches do. See Chapter 5 for more information.

Explanation

A. For the most part, switches are not cheap; however, one of the biggest benefits of using switches instead of hubs in your internetwork is that each switch port is actually its own collision domain. A hub creates one large collision domain. Switches still can't break up broadcast domains (do you remember which devices do?). Hubs do not recognize frames and data structures but switches do. See Chapter 5 for more information.

25. You need to optimize network traffic by spreading it across multiple connections. Which strategy should be used?

Load balancing

Traffic shaping

Add VLAN's

A 1Gbps connection

Following the regulations

A. Load balancing refers to a technique used to spread work out to multiple computers, net¬work links, or other devices. You can load-balance work on servers by clustering servers so that multiple machines all provide the same service. See Chapter 20 for more information.

Explanation

A. Load balancing refers to a technique used to spread work out to multiple computers, net¬work links, or other devices. You can load-balance work on servers by clustering servers so that multiple machines all provide the same service. See Chapter 20 for more information.

26. Which UTP wiring uses four twisted wire pairs (eight wires) and is rated for 250MHz?

Category 3 UTP

Category 5 STP

Category 5 UTP

Category 6 UTP

To get the high data-transfer speed, like 1Gbps, you need to use a wire standard that is highly rated, such as Category 5e or Category 6. See Chapter 3 for more information.

Explanation

To get the high data-transfer speed, like 1Gbps, you need to use a wire standard that is highly rated, such as Category 5e or Category 6. See Chapter 3 for more information.

27. You want to stop a hacker in their tracks. Which of the following devices are proactive in providing this service?

Access control list (ACL)

Content filtering

Security zones

Intrusion Prevention System (IPS)

Network Address Translation

Changing network configurations, terminating sessions, and deceiving the attacker are all actions that can be taken by an Intrusion Prevention System (IPS) device. These are all proactive approaches to security. See Chapter 15 for more information.

Explanation

Changing network configurations, terminating sessions, and deceiving the attacker are all actions that can be taken by an Intrusion Prevention System (IPS) device. These are all proactive approaches to security. See Chapter 15 for more information.

28. Which two practices help secure your wireless access points from unauthorized access?

Assigning a private IP address to the AP

Changing the default SSID value

Configuring a new administrator password

Changing the mixed-mode setting to single mode

Configuring traffic filtering

B, C. At a minimum, you need to change the default SSID value on each AP and configure new usernames and passwords on the AP. See Chapter 12 for more information.

Explanation

B, C. At a minimum, you need to change the default SSID value on each AP and configure new usernames and passwords on the AP. See Chapter 12 for more information.

Submit

29. Which of the following are not Distance Vector routing protocols? (Choose all that apply.)

OSPF

RIP

RIPv2

IS-IS

A, D. RIP and RIPv2 are Distance Vector routing protocols. OSPF and IS-IS are Link State. See Chapter 10 for more information.

Explanation

A, D. RIP and RIPv2 are Distance Vector routing protocols. OSPF and IS-IS are Link State. See Chapter 10 for more information.

Submit

30. Which of the following are considered cabling issues? (Choose all that apply.)

Crosstalk

Shorts

Open impedance mismatch

DNS configurations

A, B, C. Because most of today's networks still consist of large amounts of copper cable, they can continue to suffer from the physical issues (the options are not a complete list) that have plagued all networks since the very beginning of networking. See Chapter 19 for more information.

Explanation

A, B, C. Because most of today's networks still consist of large amounts of copper cable, they can continue to suffer from the physical issues (the options are not a complete list) that have plagued all networks since the very beginning of networking. See Chapter 19 for more information.

Submit

31. A workstation gives an error message to a user. The message states that a duplicate IP address has been detected on the network. After developing a hypothesis, what should the next step be according to the standard troubleshooting model?

Test and observe an action plan.

Determine if anything has changed.

Implement an action plan.

Document the solution and the entire process.

C. Creating an action plan and a solution, and identifying the potential effects, would be the next step according to the standard troubleshooting model. See Chapter 19 for more information.

Explanation

C. Creating an action plan and a solution, and identifying the potential effects, would be the next step according to the standard troubleshooting model. See Chapter 19 for more information.

32. Which two arp utility switches perform the same function?

-g

-A

-d

-a

-h

The arp utility's —a and —g switches perform the same function. They both show the current ARP cache. See Chapter 17 for more information.

Explanation

The arp utility's —a and —g switches perform the same function. They both show the current ARP cache. See Chapter 17 for more information.

Submit

33. You need to purge and reload the remote NetBIOS name table cache. Which nbtstat utility switch will you use?

-r

-R

/r

/R

-a

To purge and reload the remote NetBIOS name cache, you must use nbtstat —R. Remember that the R must be uppercase, and it will not work correctly without the hyphen before it. See Chapter 17 for more information.

Explanation

To purge and reload the remote NetBIOS name cache, you must use nbtstat —R. Remember that the R must be uppercase, and it will not work correctly without the hyphen before it. See Chapter 17 for more information.

34. Which three of the following are types of denial of service attacks?

Ping of Death

Stacheldraht

SYN flood

Virus FloodSyn

A denial of service (DoS) attack prevents users from accessing the system. All of the above are all possible denial of service attacks except Virus FloodSyn. See Chapter 14 for more information.

Explanation

A denial of service (DoS) attack prevents users from accessing the system. All of the above are all possible denial of service attacks except Virus FloodSyn. See Chapter 14 for more information.

Submit

35. IPv6 uses multiple types of addresses. Which of the following would describe an anycast address used by an IPv6 host?

Communications are routed to the most distant host that shares the same address.

Packets are delivered to all interfaces identified by the address. This is also called one¬to-many addressing.

Anycast is a type of broadcast.

Anycast is a new type of communication that replaces broadcasts in IPv4. Anycast addresses identify multiple interfaces, which is the same as multicast; however, the big difference is that the anycast packet is delivered to only one address: the first one it finds defined in the terms of routing distance. This address can also be called one-to-one-of¬many. See Chapter 7 for more information.

Explanation

Anycast is a new type of communication that replaces broadcasts in IPv4. Anycast addresses identify multiple interfaces, which is the same as multicast; however, the big difference is that the anycast packet is delivered to only one address: the first one it finds defined in the terms of routing distance. This address can also be called one-to-one-of¬many. See Chapter 7 for more information.

36. Which of the following uses both Distance Vector and Link State properties?

IGRP

OSPF

RIPv1

EIGRP

IS-IS

EIGRP is called a hybrid routing protocol because it uses the characteristics of both Distance Vector and Link State routing protocols. However, EIGRP can only be run on Cisco routers and is not vendor-neutral. See Chapter 10 for more information.

Explanation

EIGRP is called a hybrid routing protocol because it uses the characteristics of both Distance Vector and Link State routing protocols. However, EIGRP can only be run on Cisco routers and is not vendor-neutral. See Chapter 10 for more information.

37. Which of the following are WAN protocols or technologies? (Choose all that apply.)

ATM

ISDN

MPLS

RIP

Routing Information Protocol (RIP) is not a WAN protocol, but a routing proto¬col used in local area connections. See Chapter 16 for more information.

Explanation

Routing Information Protocol (RIP) is not a WAN protocol, but a routing proto¬col used in local area connections. See Chapter 16 for more information.

Submit

38. Which network-performance-optimization technique can delay packets that meet certain criteria to guarantee usable bandwidth for other applications?

Traffic shaping

Jitter control

Logical network mapping

Load balancing

Access lists

A. Traffic shaping, also known as packet shaping, is another form of bandwidth optimization. See Chapter 20 for more information

Explanation

A. Traffic shaping, also known as packet shaping, is another form of bandwidth optimization. See Chapter 20 for more information

39. You are using a TDR. Which three of the following actions can you do with this device?

Estimate cable lengths

Find splice and connector locations and their associated loss amounts

Display unused services

Define cable-impedance characteristics

A, B, D. Due to sensitivity to any variation and impedance to cabling, answers A, B and D are all reasons you'd use a TDR. See Chapter 18 for more information.

Explanation

A, B, D. Due to sensitivity to any variation and impedance to cabling, answers A, B and D are all reasons you'd use a TDR. See Chapter 18 for more information.

Submit

40. Which of the following IP addresses are not allowed on the Internet? (Choose all that apply.)

11.255.255.1

10.1.1.1

172.33.255.0

192.168.0.1

. The addresses in the range 10.0.0.0 through 10.255.255.255, and 172.16.0.0 through 172.31.255.255, as well as 192.168.0.0 through 192.168.255.255 are all considered private, based on RFC 1918. Use of these addresses on the Internet is prohibited so that they can be used simultaneously in different administrative domains without concern for conflict. See Chapter 7 for more detail on IP addressing and information on private IP addresses.

Explanation

. The addresses in the range 10.0.0.0 through 10.255.255.255, and 172.16.0.0 through 172.31.255.255, as well as 192.168.0.0 through 192.168.255.255 are all considered private, based on RFC 1918. Use of these addresses on the Internet is prohibited so that they can be used simultaneously in different administrative domains without concern for conflict. See Chapter 7 for more detail on IP addressing and information on private IP addresses.

Submit