Time for a request to make a trip from a source to a destination and back ¤ Factors affecting RTT: n Network infrastructure, distance between nodes, network conditions, and packet size, congestion payload compressibility, forward error correction and data compression ¨ Goodput ¤ Measure of useful application data successfully processed by the receiver, in bits-per-second. n Enables the measurement of effective or useful throughput and includes only application data n Packet, protocol, and media headers are considered overhead, and are not part of goodput