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Which encapsulations can be configured on a serial interface?

1.Ethernet

2.Token Ring

3.HDLC

4.Frame Relay

5.PPP

  • A.1 and 4
  • B.2 only
  • C.3, 4 and 5
  • D.All of the above

Answer: C

Correct answer: 3, 4 and 5

HDLC, Frame Relay and PPP are all serial encapsulations, and HDLC is the Cisco default. Ethernet and Token Ring are LAN technologies with their own interface types and cannot be configured on a serial line - the encapsulation must match the physical medium and the far end.

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