Question

Which among the layers fail to route a packet due to primary user interference?

(a) Physical layer

(b) Data link layer

(c) Network layer

(d) Transport layer

I got this question in an interview for job.

My question comes from Next Generation Wireless Network topic in division Next Generation Wireless Network of Cognitive Radio

Answer 1

Correct option is (d) Transport layer

The explanation is: The effect of primary user interference in the transport layer is the failure to route a packet. It can be mitigated by identifying missing packets using the sequence number and requesting of the retransmission of the packets.