How long does the session between A and B last, using connection-oriented communication? Explain.
In this exercise we will use a simplified mathematical model to analyze the tradeoff between connection-oriented communication and connectionless communication. Explain your answer.
On a certain network both forms of communication are provided:
• Using connection-oriented communication, it takes 50 second to establish a connection, after which a packet of up to 10 characters can be sent in 1.0 seconds over the connection, in either direction.
• Using connectionless communication, a packet of up to 10 characters can be sent in 1.2 second. (The sending of each packet takes slightly longer than in the connection-oriented case, since each packet must find its way to the receiver.)
Suppose A and B exchanges messages on this network. A initiates the communication and sends to B a message of 100 characters, which are partitioned into 10 packets. In reply, B sends a message of 50 characters, which are partitioned into 5 packets.
Assuming that there is no delay other than the time it takes for establishing a connection (in the connection-oriented case) and for packet transmission:
The session time is the ConnectionTime + time for A’s data transfer + time for B’s data transfer = 50 + 1.0*10 + 1.0*5 = 65 sec
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