What is Maximum Transmission Unit (MTU)? Maximum Transmission Unit is the size of a layer of communication protocols of the largest protocol data unit which it can pass onwards. In association with a communications interface such as NIC, serial port etc., MTU parameters usually appears. The fixation of MTU can be done by standards like Ethernet or decided at the time of connection (usually in the case of point-to-point serial links). Greater efficiency is brought by higher MTU as more user data is carried by each packet while protocol overheads remain fixed. Bulk protocol throughput improvement is referred as high efficiency. However, large packets can occupy a link that is slow for some time, which causes greater delays for the following packets and increases lag and minimum latency.
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