Abstract
For most networking tasks, the minimum underlying ‘raw’ data transfer service provided by the Data Link Layer is, by itself, too limited. Much more power for transmission of data on networks and between networks is provided by the Internet Protocol (IP) at the Network Layer — ISO Level Three. As part of its end-to-end packet delivery function, IP provides many additional transmission services. For example, it provides enriched addressing in order to permit identifying stations by both Network Number and host Node Number. It also provides Fragmentation and Reassembly in order to surmount any limitation placed by the Data Link upon the size of a frame, thereby permitting large IP datagrams to transit networks that have a small maximum packet size.
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