Overview of Network Layer Functions
While many protocol models have existed over the years, today the TCP/IP model dominates. And at the network layer of TCP/IP, two options exist for the main protocol around which all other network layer functions revolve: IP version 4 (IPv4) and IP version 6 (IPv6). Both IPv4 and IPv6 define the same kinds of network layer functions, but with different details. This chapter introduces these network layer functions for IPv4, leaving the IPv6 details until Part VII of this book.
Note
All references to IP in this chapter refer to the older and more established IPv4.
IP focuses on the job of routing data, in the form of IP packets, from the source host to the destination host. IP does not concern itself with ...
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