Question:

(a) With the help of a diagram, describe a typical DNS system.

(b) Using signal sequence or state transition diagrams, illustrate the following scenarios:

i. TCP connection set-up
ii. Cumulative Acknowledgement
(Given that Seq = 152, Data=8 bytes and 16 bytes)
iii. Termination of a connection

(c) Describe the mechanism that is used to perform flow control in TCP.

(d) State the 3 major entities that consists the Electronic Mail system.

(e) For the network below (link costs shown), use the Link State algorithm (Dijkstra) to calculate the least cost route from C to all other nodes.