Discussion
The Acme Corporation is implementing dial-up services to enable remote-office employees to connect to the local network. The company uses multiple routed protocols, needs authentication of users connecting to the network, and since some calls will be long distance, needs callback support. Which of the following protocols is the best choice for these remote services?
Answer: D
Correct answer: PPP
Three requirements point to PPP together: it carries multiple routed protocols over the same link, it authenticates with PAP or CHAP, and it supports callback, which is what turns a long-distance charge into one the company controls. HDLC in its Cisco form is proprietary and offers neither authentication nor multiprotocol negotiation, Frame Relay is not a dial-up technology, and 802.1 is not a WAN protocol at all.
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