Chapter 22. WAN Concepts

This chapter covers the following subjects:

WAN Technologies: This section examines several additional WAN technologies that were not covered in Chapter 4, namely modems, DSL, cable, and ATM.

IP Services for Internet Access: This section examines how an Internet access router uses DHCP client and server functions, as well as NAT.

Chapter 4, “Fundamentals of WANs,” introduced two important WAN technologies common in enterprise networks today:

• Leased lines, which use either High-Level Data Link Control (HDLC) or Point-to-Point Protocol (PPP)

• Frame Relay

Part IV of this book covers the remainder of the WAN-specific topics in this book. In particular, this chapter examines a broader range of WAN technologies, including ...

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