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کامپیوتر و شبکه::
شماره توالی
Duplicated messages can be detected if sequence numbers are attached to messages.
Connection-oriented protocols such as TCP overcome this by adding sequence numbers to the packets and re-ordering them at the receiving host.
As in Exercise 4.3 the number of messages and their size should be variable and a sequence number should be sent with each one.
Each recipient records the last sequence number from each sender (sender IP address can be retrieved from datagrams) and prints out any missing sequence numbers.
To allow for point (i) senders must attach a sequence number to each message.
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