Define IP Datagram, Fragmentation, and MTU.
1. IP datagram can be used for explaining a portion of IP data. Every IP datagram has a set of fields arranged in an order. The order is defined which helps in decoding and reading the stream easily. Further, the IP datagram has fields like Version, header length, Type of service, Total length, checksum, flag, protocol, Time to live, Identification, padding, options, and payload.
2. MTU stands for Maximum Transmission Unit which is the size of the largest packet that a communication protocol can pass. The size can be fixed by some standard or decided at the time of connection.
3. Fragmentation is the process of dividing the IP packets into smaller pieces. Fragmentation is required when the datagram is larger than the MTU. However, every fragment becomes a datagram in itself and is transmitted independently from the source.