31 Days Before Your CCENT Certification

Day 3: WAN Connections

Table 1-26 describes the features of point-to-point, circuit-switched, and packet-switched WAN connections.

Table 1-26. WAN Connection Types

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 Authentication Protocol (CHAP). A router can also use Frame Relay as an encapsulation. Frame Relay virtual circuits use HDLC encapsulation, and each circuit is identified ...