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There is no guarantee for the TCP’s reliable service even though a reliable delivery service is provided by each link in the Internet.

• The datagrams will reach the destination without any errors when each link in Internet provides reliable service, but the order of datagrams at sender end and receiver may differ.

• Different datagrams can choose different routes in the network and datagrams may reach the destination out of order.

• There is also a chance that some of the datagrams may be lost during transmission due to routing loops or failure of equipment.

• In data transmission, the receiver should receive the IP datagrams in the same order in which the datagrams were sent.

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