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TCP model
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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An agent that is trusted and authorized to issue certificates to approved vendors and contractors for the purpose of enabling secure interoperability with DoD entities. Operating requirements for ECAs must be approved by the DoD CIO, in coordination with the DoD Comptroller and the DoD General Counsel.
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An OSI system that contains application processes capable of communication through all seven layers of OSI protocols. Equivalent to Internet host.
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(1) Layer 2 of the OSI Reference Model. Provides reliable transit of data across a physical link. The datalink layer is concerned with physical addressing, network topology, line discipline, error notification, ordered delivery of frames, and flow control. The IEEE divided this layer into two sublayers: the MAC sublayer and the LLC sublayer. Sometimes simply called the link layer. Roughly corresponds to the datalink control layer of the SNA model. (2) A layer with the responsibility of transmitting data reliably across a physical link (cabling, for example) using a networking technology such as Ethernet. The DLL encapsulates data into frames (or cells) before it transmits it. It also enables multiple computer systems to share a single physical medium when used in conjunction with a media access control methodology such as CSMA/CD.
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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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