Question

Which among the following is not an upper layer issue?

a.

Channel sensing

b.

Routing

c.

Security

d.

Congestion control

Posted under Cognitive Radio

Answer: (a).Channel sensing Explanation:Upper layer issues are the challenges in the application layer, the transport layer, and the network layer in the implementation of cognitive radio networks. Route selection and maintenance is a challenge of the network layer. Prevention of intrusion is a challenge of the transport layer.

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Q. Which among the following is not an upper layer issue?

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