This paper takes a close look at TCP/IP as a reference for the security professional. Its goal is to consolidate information from numerous sources into one place and to go deeper into the client/server relationship. It explores basic TCP/IP concepts such as encapsulation, IP and TCP definitions, client/server connections, and discusses less well-known concepts such as state. It concludes with an illustration of an entire TCP session (Figure 10), including absolute sequence and acknowledgement numbers, state identification, and client and server responses. TCP/IP is an immense subject and this paper is by no means exhaustive, but references are supplied to help the reader further explore this topic.
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