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CCIE^™ Challenge Question

Which of the following determine whether a protocol is routable or not?

a)	A MAC address
b)	A network layer address
c)	A layer 2 address
d)	The frame format, i.e. 802.5

Answer

b)	A network layer address

Explanation

A protocol is not routable unless it has a network layer address, which corresponds to layer 3 of the OSI model. A and C are incorrect because a MAC address is a layer 2 address, and every frame has a MAC address. D is incorrect because the frame format is irrelevant in determining whether a protocol is routable or not.

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