Information Technology Reference
In-Depth Information
CHAPTER 8
Internet Protocol Version 4
This chapter reviews Internet Protocol Version 4 (IPv4) address structures and IPv4 ad-
dress types. IPv4 is the version of the protocol that the Internet has used since the initial
allocation of IPv4 addresses in 1981. The size of the enterprise indicated the address class
that was allocated. This chapter covers the IPv4 header to give you an understanding of
IPv4 characteristics. The mid-1990s saw the implementation of classless interdomain rout-
ing (CIDR), Network Address Translation (NAT), and private address space to prevent the
apparent exhaustion of IPv4 address space. Companies implement variable-length subnet
masks (VLSM) in their networks to provide intelligent address assignment and summariza-
tion. Separate IP subnets are used for IP phones and wireless LANs to segregate this traf-
fic from data traffic. The CCDA needs to understand all these concepts to design IPv4
addressing for a network.
The “Do I Know This Already?” quiz helps you identify your strengths and deficiencies in
this chapter's topics.
The ten-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.
Ta ble 8 -1 outlines the major topics discussed in this chapter and the “Do I Know This Al-
ready?” quiz questions that correspond to those topics.
Ta b l e 8 -1
“Do I Know This Already?” Foundation Topics Section-to-Question Mapping
Foundation Topics Section
Questions Covered in This Section
IPv4 Header
4, 10
IPv4 Addressing
1, 5, 9
IPv4 Address Subnets
2, 3, 6, 7
Address Assignment and Name Resolution
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