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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Link Layer: Links,access Networks, And Lans
Exercise:
Review
Question:2 | ISBN:9780132856201 | Edition: 6

Question

If all the links in the Internet were to provide reliable delivery service, would the TCP reliable delivery service be redundant? Why or why not?

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Answer

TCP Relaible Delivery Service is not redundant. Although each link guarantees that an IP datagram sent over the link will be received at the other end of the link without errors, it is not guaranteed that the IP datagrams will arrive at the ultimate destination in the proper order. With IP, datagrams emerging from the same TCP connection can take different routes in the network, and therefore arrive out of order. TCP is still needed to provide the receiving end of the application the byte stream in the correct order, also, IP can lose packets due to routing loops or equiptment failure.

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