8.8. Answers to Review Questions

  1. C. The command debug ppp authentication will show you the authentication process that PPP uses between point-to-point connections.

  2. C. The key is "there are no free ports" on your router. Only Frame Relay can provide a connection to multiple locations with one interface, and in an economical manner no less.

  3. A. If you have a serial port configured with multiple DLCIs connected to multiple remote sites, split horizon rules stop route updates received on an interface from being sent out the same interface. By creating subinterfaces for each PVC, you can avoid the split horizon issues when using Frame Relay.

  4. C, D, E. Ethernet and Token Ring are LAN technologies and cannot be configured on a serial interface. PPP, HDLC, ...

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