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Download File - Ram Chavan
Transcript
Data Link Protocol A method of handling the establishment, maintenance, and termination of a logical link between nodes. Ethernet is a DLP. Data Terminal Equipment (DTE) The source or destination of data, usually attached to a network by DEC devices. A terminal or computer acting as a node on a network is usually a DTE device. Defense Communications Agency (DCA) The governmental agency responsible for the Defense Data Network (DDN). Defense Data Network (DDN) Refers to military networks such as MILNET, ARPANET, and the communications protocols (including TCP/IP) that they employ. Destination Address The destination device's address. Distributed Processing When a process is spread over two or more devices, it is distributed. It is usually used to spread CPU loads among a network of machines. Domain Name System (DNS) A service that converts symbolic node names to IP addresses. DNS is frequently used with TCP/IP. DNS uses a distributed database. Dotted Decimal Notation A representation of IP addresses. Also called "dotted quad notation" because it uses four sets of numbers separated by decimals (such as 255.255.255.255). Double-Byte Character Set A character set in which alphanumeric characters are represented by two bytes, instead of one bytes as with ASCII. Double-byte characters are often necessary for oriental languages that have more than 255 symbols. Dumb Terminal A terminal with no significant processing capability of its own, usually with no graphics capabilities beyond the ASCII set. Emulation A program that simulates another device. For example, a 3270 emulator emulates an IBM 3270 terminal, sending the same codes as the real device would. Ethernet A data link level protocol comprising the OSI model's bottom two layers. It is a broadcast networking technology that can use several different physical media, including twisted pair cable and coaxial cable. TCP/IP is commonly used with Ethernet networks. Ethernet Address A 48-bit address commonly referred to as a "physical" or "hard" address, which uniquely identifies the Ethernet Network Interface Card (NIC) and hence the device the card resides in. Ethernet Meltdown A slang term for a situation in which an Ethernet network becomes saturated. The
