Chapter 4

TCP/IP DoD Model

The following topics Are covered in this chapter:

  • Describing the TCP/IP Transport Layer
  • Transport Layer Functions
  • Reliable vs. Best–Effort
  • UDP Characteristics
  • TCP Characteristics
  • TCP/IP Applications
  • Mapping Layer 3 to Layer 4
  • Mapping Layer 4 to Applications
  • Establishing a Connection with a Peer System
  • Flow Control
  • TCP Acknowledgment
  • Windowing
  • TCP Sequence Number and Acknowledgment Numbers

The Transmission Control Protocol/Internet Protocol (TCP/IP) suite was created by the Department of Defense (DoD) to ensure and preserve data integrity as well as maintain communications in the event of catastrophic war. So it follows that if designed and implemented correctly, a TCP/IP network can be a truly dependable and resilient one. In this chapter, I’ll cover the protocols of TCP/IP, and throughout this book, you’ll learn how to create a marvelous TCP/IP network—using Cisco Nexus switches and IOS routers, of course.

We’ll begin by taking a look at the DoD’s version of TCP/IP and then compare this version and its protocols with the OSI reference model discussed in Chapter 2, “Internetworking.”

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Introducing TCP/IP

Because TCP/IP is so central to working with the Internet and intranets, it’s essential for you to understand it in detail. I’ll begin by giving ...

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