Chapter 9 Review

Your company has leased a Class C network whose network ID is 205.61.128.0. You want to create 16 subnets within this network. One of the subnets will have an extended network prefix of 205.61.128.64. What will be the broadcast address for this subnet?

...A. 205.61.128.79

D. route

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E. It enables multiple users to easily share a central mailbox.

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You have decided to use PAT on your small office network. At minimum, how many IP addresses must you obtain from your ISP in order for all five clients in your office to be able to access the servers on the Internet?

A. 1

On a network with an IP address of 140.133.28.72 (or 11111111 11111000 0001110001001000) and a subnet mask of 255.248.0.0 (or 11111111 11111000 0000000000000000), what is the network ID?

A. 140.128.0.0 (or 10001100 10000000 00000000 00000000)

(Hint: If you know the number of hosts per subnet, you can easily determine the broadcast address.)

A. 205.61.128.79

You decide to create 254 subnets on your Class B network. What subnet mask will you use to accomplish this?

A. 255.255.0.0

Which two of the following are benefits of using IMAP4 relative to POP3?

A. It allows users to review and delete mail without downloading it from the mail server.

Which of the following commands allows you to view the routing table on your Linux workstation? (Choose all that apply)

A. netstat -r

Which of the following commands reveals the default gateway address for all the hosts to which a router is connected?

A. route

You have enabled NAT on your small office's router. The router's private network IP address is 192.168.6.1. Which of the following IP addresses is the most likely to be automatically assigned to one of the workstations that uses this router as its default gateway?

B. 192.168.6.6

What is the default subnet mask for a Class C network?

B. 255.255.255.0

As a networking consultant, you've been asked to help expand a client's TCP/IP network. The network administrator tells you that the network ID is subnetted as 185.27.54.0/26. On this network, how many bits of each IP address devoted to host information?

B. 6

A node on a network has an IP address of 140.133.28.72 and its subnet mask is 255.248.0.0. What type of subnetting has been used on this network?

B. Supernetting

When you use the mtr command to assess the path from your office workstation to a server on your company's WAN that's located in Spain, what is the first hop the mtr command will display?

B. Your default gateway's IP address

Your workstation's IP address is 10.35.88.12, and your supervisor's workstation's IP address is 10.35.91.4. When you send data from your workstation to your supervisor's workstation, what is the most likely IP address of the first default gateway that will accept and interpret your transmission?

C. 10.35.88.1

If you worked on a network that could not interpret classless addressing, and your network ID was 145.27.0.0, what is the theoretical maximum number of different subnets you could create on this network?

C. 128

If you subdivide your Class B network into 254 subnets, what is the maximum number of hosts you can assign to any single subnet?

C. 254

What utility might you use to find out whether your ISP's router is responsible for the poor network performance your organization experiences in a particular afternoon?

C. mtr

If you know that your colleague's TCP/IP host name is JSMITH, and you need to find out his IP address, which of the following commands should you type at your shell prompt or command prompt?

C. nslookup jsmith

Convert the following subnet mask into its dotted decimal equivalent: 11111111 11111111 11111000 00000000.

D. 255.255.248.0

What Network layer protocol does the traceroute utility use to obtain its information about paths between a source and destination?

D. ICMP

Suppose your office's only DNS server was down, and you wanted to view the DNS address record for your company's domain. Which of the following TCP/IP utilities would allow you to do this?

D. dig