16.10. Answers to Review Questions

  1. D. Routing Information Protocol (RIP) is not a WAN protocol but a routing protocol used in internetworks.

  2. C. These different protocols and technologies all occupy the lower three layers of the OSI model: the Physical layer, the Data Link layer, and sometimes the Network layer. Most WAN protocols work only at the Physical layer and Data Link layer, with MPLS being a 2.5 layer protocol.

  3. B. The demarcation point is the precise spot where the service provider's responsibility ends and the CPE begins.

  4. C. The European version of the T1 is the E1, which operates at 2.048Mbps and uses 30 64Kbps channels (thirty DS0's).

  5. C. The demarc is the precise spot where the service provider's (local exchange carrier) responsibility ...

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