Basic IP Concepts
Internet Protocol (IP) routing is the heart of the Internet today. It is the only protocol that carries information between different domains. All other protocols (for example, Novell and AppleTalk) work locally within their own domains.
Because IP is designed to send information packets from source to destination without understanding the underlying technologies, it does not guarantee delivery of the packet. It simply puts forth its best effort to send the packet to its destination. IP packets that are sent using the best-effort delivery are sometimes called datagram services. Because IP is also connectionless, there is no guarantee that all the data packets from the same connection will follow the same path or be delivered ...
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