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In transport layer, Multiplexing is done at _________

(a) Channel

(b) Receiver site

(c) Sender site

(d) Packet

I got this question by my school principal while I was bunking the class.

I need to ask this question from P2P Applications topic in chapter TCP/IP Protocol Suite of Computer Network

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Right choice is (c) Sender site

The best I can explain: At the sender’s side, there are multiple processes which may want to send packets. But there is only one transport layer protocol like TCP or UDP working at a time. So the transport layer protocol gets the messages from these processes and separates them with different port numbers. This process is called multiplexing and it is done before sending packets to the receivers side.

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