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The source-quench message in ICMP was designed to add a kind of ____________ to the IP.

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The source-quench message in ICMP was designed to add a kind of ____________ to the IP.

(a) error control

(b) flow control

(c) router control

(d) switch control

I had been asked this question during an online exam.

My question is from ICMP topic in chapter TCP/IP Protocol Suite of Computer Network

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Right option is (b) flow control

To explain I would say: Firstly, it informs the source that the datagram has been discarded. Secondly, it warns the source that there is congestion in the network. It’s type 4 error reporting message after which the source is expected to reduce the flow of packets.

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