This question concerns the relationships between client-server connections and p

Question

This question concerns the relationships between client-server connections and ports. (a) A browser initiates a 3-way handshake with a web server over a connection with source- endpoint label (128.255.22.51, 9157 173.194.77.103, 80). What will be the source- endpoint label of the connection carrying the server's response? (b) Suppose that it is known that all TCP segments arriving at a server are destined for three distinct ports. How many TCP client connections are open: less than three, exactly three, (c) What is the least number of sockets that a TCP server must open to service three clients? (d) Is it possible for two clients on different hosts to connect to the same server port from (e) Is it possible for two clients on the same host to connect to the same server port from or three or more? Explain. Explain. the same port number? Explain. the same port number? Explain.

Explanation / Answer

Part (a) :

Source endpoint label of the connection carrying the server's response - (173.194.77.103, 80 ; 128.255.22.51, 9715).

When the source sends the SYN(synchronize) message for the 3-way handshaking, then the server responses with the SYN+ACK message with destination 128.255.22.51, 9157 and source will be 173.194.77.103 ,80. This is an http request because the port 80 is reserved for http request.

Part (b) :

Exactly 3, because for each sessions the server opens a specific & separate connection for each arriving segments.

Part (c) :

Three(3), because the socket is responsible for end-to-end connectivity for the segments, therefore 3 sockets will be needed.

Part (d) :

Yes, because the host uses an un reserved port number which is allotted by the CPU and the port number of server is reserved when the client requests to the server, the servers opens a special segment for each request. Therefore request coming from same port number are treated differently, therefore connection is possible.

Part (e) :

No, because clients in the same host can not send requests with the same port number.

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