The following questions test your understanding of the topics covered in this chapter. The final questions in this section repeat the opening "Do I Know This Already?" questions. These are repeated to enable you to test your progress. After you have answered the questions, find the answers in Appendix A. If you get an answer wrong, review the answer and ensure that you understand the reason for your mistake. If you are confused by the answer, refer to the appropriate text in the chapter to review the concepts.
1 Identify one criterion to help determine a subnet mask for classful addressing when designing a network-addressing scheme.
2 Which command is used to forward broadcast traffic across a router to a particular destination?
3 With a classless address of 188.8.131.52/20, what is the range of classful addresses that are included in the address? Write your answer in dotted decimal and the third octet in binary notation.
What is a discontiguous network?
5 For VLSM to be available as a design option in the network, what characteristic must the routing protocol possess?
6 If summarization is to be implemented in the network, name one design criterion for the addressing scheme that must be in place?
7 What networks are provided in RFC 1918, and what prefix mask accompanies each network?
8 If the host portion of a subnet has been used to identify end devices, can that subnet be used again for VLSM?
9 Describe the purpose of the ip forward-protocol command.
10 Which command is used on point-to-point lines to conserve IP address space?
11 Give one example of when route summarization would not be a good solution.
12 Give one reason for implementing router summarization.
13 Given an address of 184.108.40.206 and a prefix mask of /25, how many networks can be addressed, and how many hosts can exist on each network? Write the first and last possible subnets in binary and decimal notation.
14 What class of address is 220.127.116.11, and how many hosts can be addressed if no subnetting is used?
15 If given a Class C address with the requirement to accommodate 14 subnets and 10 hosts on each subnet, what subnet mask would you use?
16 List the range of hosts available on the 18.104.22.168/28 subnet.
17 Convert the subnet address 22.214.171.124/24 to binary notation, and state the class to which it belongs.
18 Write out the decimal notation of the following subnet mask presented in the binary notation of 11111111.11111111.11111111.11111000.
19 What does VLSM stand for?
20 The Class B network address of 126.96.36.199 has been given a mask of 255.255.255.0. The subnets 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, and 188.8.131.52 need to be summarized using VLSM. Give the subnet and new mask to achieve this summarization.
21 Is 184.108.40.206/20 a valid subnet mask?
22 Which routing protocols support VLSM?
23 Briefly define route summarization.
24 What sort of design scheme does route summarization require?
25 In route summarization, where is the subnet mask moved?
26 How does summarization allow for smaller routing tables?
27 Identify two private addresses defined in RFC 1918.
28 What is a discontiguous network?
29 What does CIDR stand for?
30 Which RFC is responsible for first describing the use of subnet masking?
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