When we talk about the length of a connection chain containing multiple connections, we use the RTT between a request and its response to represent the length of the connection chain, why not use the RTT between a request packet and its acknowledgement?
Each acknowledgement is from the sender's adjacent directly connected host, other than the end host of the chain.
Not really, the RTT between a request and its acknowledgement can also represent the length of the whole connection chain.
response contains the request processing time.
acknowledgement does not contain the request processing time.
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