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pg1 - Datagram Format contd Other fields include protocol...

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Datagram Format cont’d. Other fields include protocol, header checksum, source/destination IP addresses, options and data. o Checksum in transport layer is computed over entire packet contents.  o In network layer checksum is only computed over the IP header. IP header = 20 bytes, TCP header = 20 bytes   40 byte header MTU – maximum transfer unit. The largest amount of a data that a link layer frame can contain.  Places a hard limit on size of datagram. If a datagram needs to be passed to a link with a smaller MTU than the packet’s current size then the  packet will be fragmented. Fragments MUST be reassembled before they reach transport layer. o All fragments in one chunk have same id, and different offsets o Only the data bits of datagram get fragmented.
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