Summary
IP provides the internetworking building block for all other Internet Layer and higher protocols in the TCP/IP suite. IP provides a best effort, unreliable, connectionless datagram delivery service between networks of an IP internetwork. The IP header provides addressing, type of delivery, maximum link count, fragmentation, and checksum services. IP fragmentation provides a way for IP datagrams to travel over links with a lower IP MTU than the original IP datagram. The basic services of the IP header are extended through IP options, the most common of which provide source routing, path recording, router alert, and timestamping functions.
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