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Which encapsulation type should be used for the S0 port of router R2?
A. SAP
B. HDLC
C. ARPA
D. Novel Ether
Answer: B
Explanation: Router R2 S0 connects to Router R1 S0. Router R1 S0 uses HDLC, and BOTH sides must run
the same protocol in order to communicate (it is like talking the same language; you can’t have one side English
and the other Side French).
So the correct answer is B – HDLC.
Incorrect answers:
A, B and C are incorrect; the two routers must have the same encapsulation type to communicate properly thus
these encapsulation types could not be used.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 368-373.
Q. 170