Question

A sequence of UDP packets addressed to ports 1979, 8854, 9000, 1979, and 9000. Explain why they can be distributed to the right processes.

Answer 1

Every process is assigned a unique port number. When the packet reaches a host, the port number of a packet is checked in the transport layer, and it is forwarded to the process running on that port number.

For the given question, let

Process	Port Number
Process A	1979
Process B	8854
Process C	9000

1. When a UDP packet addressed to 1979 comes, it is sent to Process A.
2. When a UDP packet addressed to 8854 comes, it is sent to Process B.
3. When a UDP packet addressed to 9000 comes, it is sent to Process C.
4. When a UDP packet addressed to 1979 comes, it is sent to Process A.
5. When a UDP packet addressed to 9000 comes, it is sent to Process C.

Every process on a host has a unique port number, so the packets get distributed to the right processes.

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