Common WAN protocols include PPP, HDLC, and Frame Relay. There are many others, of course, but you need to focus on those included in the CCNA syllabus.
Point-to-Point Protocol (PPP) can be used when you have a Cisco device connecting to a non-Cisco device. PPP also has the advantage of including authentication. It can be used over a number of connection types, including DSL, circuit-switched, and asynchronous/synchronous connections.
Cisco’s High-Level Data Link Control (cHDLC) is its implementation of the open standard version of HDLC. HDLC requires DTE and DCE and is the default . . .
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