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Frame relay has _______

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Frame relay has _______

(a) only physical layer

(b) only data link layer

(c) only network layer

(d) both physical and data link layer

I have been asked this question in an online quiz.

Question is from ATM & Frame Relay topic in chapter Frame Relay of Computer Network

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The correct answer is (d) both physical and data link layer

The best I can explain: The physical layer is guided by the protocols recognized by the ANSI. The data link layer supports the simplified core functions specified by the OSI model.

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