Round Trip Time(RTT)
RTT, expressed in milliseconds, is the elapsed time for a request to go from node `A' to node `B', and for the reply from `B' to return to `A.'
The RTT is the total time for the trip. The forward and reverse path times do not need to be the same.
RTT depends on the network infrastructure in place, the distance between nodes, network conditions, and packet size. Packet size, congestion, and payload compressibility have a significant impact on RTT for slower links.
Other factors can affect RTT, including forward error correction
and data compression
, which introduce buffers and queues that increase RTT.