CCNA Discovery 2, Chapter 5
5.2.3 and 5.5.6: After you have connected your router or customer premises equipment (CPE) device to the Channel Service Unit/Data Service Unit (CSU/DSU) provided by the ISP, you need to configure the interface on the router. If the interface is a serial interface, the CSU/DSU provides the clock rate as the data circuit-terminating equipment (DCE), and your router acts as the data terminal equipment (DTE).
The Cisco default encapsulation for a serial interface is High-Level Data Link Control (HDLC); however, you can change the encapsulation to PPP as a more flexible, nonproprietary encapsulation. In addition, PPP supports authentication in clear-text Password Authentication Protocol (PAP) or encrypted Challenge Handshake ...
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