Question: 1.Given that Data Link Layer protocols already employ sequence numbers, provide 2 distinct motivations for Network Layer protocols also employing sequence numbers. 2.Why doesn't each

1.Given that Data Link Layer protocols already employ sequence numbers, provide 2 distinct motivations for Network Layer protocols also employing sequence numbers.

2.Why doesn't each node in a virtual circuit use the same number to identify the circuit?

3.Briefly, in a sentence or two, distinguish between the terms flow control and congestion control.

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