TCP/IP Fundamentals
Lesson 4: TCP/IP Headers
Recall from your CCNA studies that the Internet layer of the TCP/IP stack maps to Layer 3 (that is, the network layer) of the Open Systems Interconnection (OSI) model. While multiple routed protocols (for example, IP, IPX, and AppleTalk) reside at the OSI model’s network layer, Internet Protocol (IP) has become the de-facto standard for network communication.
Sitting just above IP, at the transport layer (of both the TCP/IP and OSI models) is Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). This section reviews the basic operation of the TCP/IP suite of protocols, as their behavior ...
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