Question: (b) What are the main services that a link-layer protocol can offer to the network layer and which of these have corresponding services in TCP?

(b) What are the main services that a link-layer protocol can offer to the network layer and which of these have corresponding services in TCP? Suppose two nodes start to transmit at the same time a packet of length L over a broadcast channel of rate R. If the propagation delay between the two nodes is dprop, explain whether there would be a collision if dprop is very much less than L/R. (6 marks) (c) If a datagram has a packet size of N bytes (including header) between source Host A and destination Host B, explain how many datagrams would be required to send an MP3 file consisting of 5 Mbytes, assuming a 20-byte IP header? Assume the maximum transmission unit (MTU) of the link is 1,500 bytes and there is no fragmentation. (6 marks)

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