CCENT Cisco Certified Entry Networking Technician Study Guide: (ICND1 Exam 640-822), 2nd Edition

Chapter 10: Introduction to Wide Area Networks

1. C, D. The two authentication methods built into PPP are CHAP and PAP.
2. C. If you have only one free serial interface on your router, you can use Frame Relay to connect multiple remote sites using PVCs (subinterfaces).
3. A, B, C. ISDN is considered a layer 3 WAN technology and is completely outdated. Cisco considers PPP, HDLC, and Frame Relay the most common WAN technologies.
4. B, C, E. Leased lines, circuit switching, and packet switching are the typical WAN connection types.
5. B. You cannot use the no encapsulation command on a serial interface. To enable a certain encapsulation or to change to a different encapsulation type, use encapsulation ppp, for example.
6. C, D, E. Ethernet is a LAN technology and ...