This chapter covers the following topics:
Introduction to IPv6—Discusses the need for IPv6's larger address space and the features of IPv6.
The IPv6 Packet Header—Describes the fields in the IPv6 packet header.
IPv6 Addressing—Explains how IPv6 addresses are represented, and describes the details of each type of IPv6 addresses.
IPv6 Address Assignment—Describes how IPv6 addresses can be assigned to devices.
IPv6 Mobility—Discusses how IPv6 allows mobile users to stay connected.
This chapter begins the discussion of Internet Protocol version 6 (IPv6) and focuses on understanding the features of IPv6, its packet header, and its addressing types and structure. The chapter concludes with a discussion of IPv6 address-assignment strategies and IPv6 mobility.
A well-designed IPv6 network looks similar to a well-designed Internet Protocol version 4 (IPv4) network. Of course there are differences in addressing, but the hierarchical design discussed in Chapter 1, "Network Design," continues to be preferred because it supports summarization, which is the key to scalability.
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 need to answer these questions.
The 12-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 20-1 outlines the major topics discussed in this chapter and the corresponding quiz questions.
|Foundation Topics Section||Questions Covered in This Section||Score|
|Introduction to IPv6||1|
|The IPv6 Packet Header||2–4|
|IPv6 Address Assignment||11|
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.
|1.||How long is an IPv6 address?
|2.||For which field in the IPv4 header is there not a similar field in the IPv6 header?
|3.||How large is the basic IPv6 header (without any extensions)?
|4.||Which of the following functions is implemented with extension headers?
|5.||Which of the following is a valid host unicast IPv6 address?
|6.||What is the EUI-64 format interface identifier that corresponds to the MAC address 00-0C-27-A2-13-1B?
|7.||Which of the following is not supported by IPv6?
|8.||An IPv6 enterprise will typically be assigned a prefix at which level?
|9.||A NIC has a MAC address of 00-0F-66-81-19-A3 and discovers a routing prefix of 2001:0:1:5::/64. Which IPv6 addresses are assigned to it?
|10.||IPv6 multicast addresses use which prefix?
|11.||Which two items does stateless autoconfiguration use?
|12.||A mobile IPv6 binding is an association between which of the following?
The answers to the "Do I Know This Already?" quiz are found 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: