C HAPTER
2
and Summarization
This chapter discusses IP addressing and summarization. It begins with a short review of CCNA
concepts, including binary and IP subnetting. It then uses those concepts as a springboard to
The ﬁrst section, “Understanding IP Addresses,” describes the structure of an IPv4 address and
provides classful and classless methods that can be used to calculate the range of a given subnet.
The second section, “Understanding Summarization,” builds on the range of calculation
methods by describing how larger groups of addresses can be advertised in the simplest possible
manner. This section reviews why summarization is important and discusses how to apply
summarization to network design.
The topics in this chapter are indirectly important for the BSCI exam. Although you will not be
tested directly on these topics, each routing protocol will introduce a technique to create
summaries and you will be tested with questions that combine your understanding of
summarization and the commands necessary to apply summarization.
“Do I Know This Already?” Quiz
The purpose of the “Do I Know This Already?” quiz is to help you decide which parts of this
chapter to use. If you already intend to read the entire chapter, you do not necessarily
The 11-question quiz, derived from the major sections in the “Foundation Topics” portion of the
chapter, helps you determine how to spend your limited study time.
Table 2-1 outlines the major topics discussed in this chapter and the corresponding quiz questions.
Table 2-1 “Do I Know This Already?” Foundation Topics Section-to-Question Mapping
Foundation Topics Section Questions Covered in This Section Score
Understanding Summarization 10–11
Total Score
38 Chapter 2: IP Address Planning and Summarization
1.
What is the binary for 172?
a. 1 111 10
b. 1010 1100
c. 1100 0000
d. 1011 1111
2. What is the binary for 128?
a. 1 10 1000
b. 1010 1010
c. 1000 0000
d. 1011 1111
3. What is the decimal for 1100 0000?
a. 192
b. 194
c. 200
d. 202
4. What class is 172.16.1.1?
a. Class A
b. Class B
c. Class C
d. Class D
5. What class is 10.37.5.11?
a. Class A
b. Class B
CAUTION The goal of self-assessment is to gauge your mastery of the topics in this chapter.
If you do not know the answer to a question or are only partially sure of the answer, you
should mark the question wrong for purposes of the self-assessment. Giving yourself credit for
an answer you correctly guessed skews your results and might provide you with a false
sense of security.
“Do I Know This Already?” Quiz 39
c. Class C
d. Class D
6. What is the CIDR-notation equivalent of 255.255.255.0?
a. /20
b. /22
c. /24
d. /26
7. What is the dotted-decimal equivalent of /27?
a. 255.255.255.0
b. 255.255.224.0
c. 255.255.255.224
d. 255.255.0.0
8. What is the network for the address 192.168.37.62/26?
a. 192.168.37.0
b. 255.255.255.192
c. 192.168.37.64
d. 192.168.37.32
a. 192.168.190.59
b. 255.255.190.55
c. 192.168.190.63
d. 192.168.190.0
10. Given the addresses 10.1.8.0/24 and 10.1.9.0/24, which of the following is the best summary?
a. 10.0.0.0/8
b. 10.1.0.0/16
c. 10.1.8.0/23
d. 10.1.10.0/24
40 Chapter 2: IP Address Planning and Summarization
11.
Given the addresses 10.1.138.0/27, 10.1.138.64/26, and 10.1.138.32/27, which of the
following is the best summary?
a. 10.0.0.0/8
b. 10.1.0.0/16
c. 10.1.138.0/24
d. 10.1.138.0/25
You can ﬁnd the answers to the “Do I Know This Already?” quiz in Appendix A, “Answers
to Chapter ‘Do I Know This Already?’Quizzes and Q&A Sections.” The suggested choices
for your next step are as follows:
7 or less correct—Read the entire chapter. This includes the “Foundation Topics” and
“Foundation Summary,” and the “Q&A” section.
8 or 9—Begin with the “Foundation Summary” section, and then go to the “Q&A” section
at the end of the chapter. If you have trouble with these exercises, read the appropriate
sections in “Foundation Topics.
10 or more—If you want more review on these topics, skip to the “Foundation Summary”
section and then go to the “Q&A” section. Otherwise, move to the next chapter.

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