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Q. What is Retransmission timer?
Retransmission timer
- not fixed because paths that IP packets take may differ
- If too short - retransmissions -> waste of bandwidth
- If too large - delay for the application program
RTT = * previous RTT + (1- ?)*current RTT, usually 90 %
Karn's algorithm:
- don't consider the RTT of a retransmitted segment in the calculation of the new RTT
telecommunication processors
Q. Describe Flow and Error Control Mechanisms? Flow and Error Control Mechanisms - Stop and Wait ARQ - Go-Back ARQ - Selective Repeat ARQ
categories of LAN
1. A computer system has a two-level memory cache hierarchy. The L1 cache has a zero hit penalty, a miss penalty of 5 ns and a hit rate of 95 percent. The L2 cache has a miss pena
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Q. Use of Infrared? - Frequencies among 300 GHz and 400 THz - Short-range communication - High frequencies can't penetrate walls - Necessitate line-of-sight propagati
WAN -Wide Area Network
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