computer networks c. We saw the the FTP protocol uses out of band connections, i

Question

computer networks

c. We saw the the FTP protocol uses out of band connections, in that the control and data are over separate TCP connections: Is it possible for an application to communicate out of band, where one band is TCP and the other UDP? If so, how would this be implemented? If not, explain why not. Imagine looking at the traffic intensity over time at a particular router in the network. intensity averages 0.5, then after a period of time rises to 0.91 on average, then rises again to 1.39 and finally settles down around 0.27. Briefly explain what you would experience over these 4 phases of time.

Explanation / Answer

Solution :-

c)

UDP is faster than TCP.It just keeps on sending the packet without waiting for an acknowledgement whereas TCP waits for acknowledgement,does lot of error checking,flow control activities which are not present in UDP.

Also any case of failure,TCP retransmits the data.

So,as far as speed is concerned,UDP is a better choice

FTP uses two TCP connections.

One TCP is to pass control information,and is not used to send files on PORT 21,only control information.

and the Other TCP,a data connection on PORT 20 to send the data files between Client and the Server.

Please upvote my answer :)

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