Explain how ftp works, Computer Network Security

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QUESTION

(a) FTP is a protocol used for the delivery of files across networks. Explain how FTP works (support your answer with a diagram).

(b) How does TCP perform the given functions?

i. Flow Control.
ii. Congestion Control.
iii. Error/loss recovery

(c) Using state diagrams, illustrate the following:

i. Lost Data
ii. Premature Timeout

(d) Explain the differences between IMAP and POP3 protocols used for the functioning of E-Mail systems.

(e) For the network shown, use the Distance Vector Routing Algorithm to determine the least cost route from A to all other nodes.

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