Which encapsulations can be configured on a serial interface? Ethernet Token Ring HDLC Frame Relay PPP

1 and 4
2 only
3, 4 and 5
All of the above

Correct Answer: 3, 4 and 5

Explanation:

Ethernet and Token Ring are LAN technologies and cannot be configured on a serial interface. PPP, HDLC, and Frame Relay are layer 2 WAN technologies that are typically configured on a serial interface.

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