PPP over Ethernet
To finish off this chapter, this final topic takes a brief departure away from listing WAN technologies, instead discussing one technology overlaid on top of some DSL connections: PPP over Ethernet (PPPoE).
PPP over Ethernet Concepts
First, think back to Chapter 12’s discussion of PPP and CHAP for a moment. PPP is one of those frankly boring data link protocols used on point-to-point links, whereas Challenge Handshake Authentication Protocol (CHAP) is that part of PPP that allows authentication. PPP can be used on serial links, which includes those links created with dial-up analog and ISDN modems. For instance, the link from a dial user to an ISP, using analog modems, likely uses PPP today. Figure 15-12 shows a basic representation ...
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