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多項選擇題

Which of the following correctly describe characteristics of PPP?（）

A. Encapsulates several different types of routing protocols.
B. Supports only IP.
C. Can be used over analog circuits.
D. Is proprietary to Cisco
E. Supports error correction.

多項選擇題

What are some common layer 2 encapsulations for a WAN link?（）

A. Ethernet
B. PPP
C. Token Ring
D. HDLC
E. Frame Relay
F. POTS