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Implementing Cisco Networking Solutions by Harpreet Singh

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Latency

Latency is the average time that is taken by a packet to travel from the source to the destination, and for the acknowledgement to travel back from the destination to the source. It is also referred to as Round Trip Time (RTT).

Recall from Chapter 1, Network Building Essentials, that the TCP window size is the maximum value of data that can be sent without waiting for an acknowledgement. The sender has to wait to send more data until it gets an acknowledgement of the data sent earlier. So, even for networks without any packet loss, the network is idle until the ACK is received. If the RTT on the network is high, the ACK takes more time to come back, and hence the throughput reduces, as the link is idle for longer durations of time. ...

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