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Extra info for Cisco Certified Network Associate Fast Pass-3rd.Edition
When a communication system is designed in this manner, it’s known as layered architecture. Think of it like this: You and some friends want to start a company. One of the first things you’ll do is sit down and think through what tasks must be done, who will do them, the order in which they will be done, and how they relate to each other. Ultimately, you might group these tasks into departments. Let’s say that you decide to have an order-taking department, an inventory department, and a shipping department.
Similarly, software developers can use a reference model to understand computer communication processes and see what types of functions need to be accomplished on any one layer. If they are developing a protocol for a certain layer, all they need to concern themselves with is that specific layer’s functions, not those of any other layer. Another layer and protocol will handle the other functions. The technical term for this idea is binding. The communication processes that are related to each other are bound, or grouped together, at a particular layer.
The figure shows the different fields within the TCP header. 10 TCP segment format Bit 0 Bit 15 Bit 16 Source port (16) Bit 31 Destination port (16) Sequence number (32) Header length (4) Reserved (6) Code bits (6) Checksum (16) Window (16) 24 bytes Acknowledgment number (32) Urgent (16) Options (0 or 32 if any) Data (varies) The TCP header is 20 bytes long, or up to 24 bytes with options. You need to understand what each field in the TCP segment is: Source port The port number of the application on the host sending the data.