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What is the primary cause of the link-layer delay?

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What is the primary cause of the link-layer delay?

(a) Selection of appropriate protocol

(b) Selection of routing path

(c) Packet generation

(d) Frame generation

The question was posed to me in exam.

I want to ask this question from Next Generation Wireless Network topic in portion Next Generation Wireless Network of Cognitive Radio

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Right choice is (a) Selection of appropriate protocol

For explanation: Each spectrum band is assigned a different protocol with respect to the interference level, path loss, and wireless link errors of the band. The link-layer packet transmission delay differs with different protocols.

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