Reverse Address Resolution Protocol (RARP)

A subprotocol of the TCP/IP protocol suite that operates at the Data Link layer (layer 2). ARP is used to discover the MAC address of a system by polling using its IP address. The Internet protocol used to dynamically map Internet addresses to physical (hardware) addresses on the local area network. Limited to networks that support hardware broadcast.
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A set of communications protocols that encompasses media access, packet transport, session communications, file transfer, electronic mail, terminal emulation, remote file access, and network management. TCP/IP provides the basis for the Internet. The structure of TCP/IP is as follows: Process layer clients: FTP, Telnet, SMTP, NFS, DNS; Transport layer service providers: TCP (FTP, Telnet, SMTP), UDP (NFS, DNS); Network layer: IP (TCP, UDP); and Access layer: Ethernet (IP), Token ring (IP).
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A connectionless protocol located at layer 4 of the OSI model. A transport protocol in the Internet suite of protocols. UDP, like TCP, uses IP for delivery; however, unlike TCP, UDP provides for exchange of datagrams without acknowledgments or guaranteed delivery.
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A network protocol conceptual model that was derived from TCP/IP. Also known as the DARPA model and the DoD model. The TCP model has four layers as opposed to the OSI model’s seven. Those four layers from the bottom up are Link, Internet, Host-to-Host, and Process.
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Standardized datalink layer address ingrained into a NIC that is required for every port or device that connects to a LAN. Other devices in the network use these addresses to locate specific ports in the network and to create and update routing tables and data structures. MAC addresses are 6 bytes long and are controlled by the IEEE. Also known as
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