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from the internet, data link and physical layer and delivers error free data to the application program.
18a) IP is a connectionless protocol b) it is unreliable protocol. Even though it has a header checksum field which checks for errors but it simply discards it with out trying to fix the problem. There is only error detection not correction and so is not considered reliable.
1) If the acknowledgment is lost the TCP sender retransmits the information. The sender receives the information a second time. Since the information is received again, the receiving TCP will know that its acknowledgment was lost and so send another acknowledgment and it discards of the duplicated information...
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