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United Education Institute CST
Module D: Applied Networking
25
Computer Science
Undergraduate 1
10/09/2008

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Term
10Base2
Definition
Also called Thinnet or Thin Ethernet LAN designed to run on common coax RG-58 cabling, almost exactly like the coax for cable television. It runs at 10 megabits per second and has a maximum sement length of 185 meters. It uses baseband signaling and BNC connectors.
Term
10Base5
Definition
Also called Thicknet or Thick ethernet the original Ethernet LAN, designed to run on specialized coax cabling. It runs at 10 megabits per second, has a maximum segment length of 500 meters and uses baseband signaling. It uses DIX or AUI connectors and external transceivers.
Term
5-4-3 rule
Definition
A general rule for approximating the correct size of a collision domain. In a collision domain, no two nodes can be separated by more than five repeaters, four segments, and three populated segments.
Term
802.3 standard
Definition
The IEEE subcommittee defining the MAC sublayer. This sublayer uses Carrier Sense Multiple Access with Collision Detection for access to the physical medium.
Term
802.5
Definition
IEEE standard modeled after the IBM Token Ring network. Defines Token Ring.
Term
Baseband
Definition
Digital Signaling that has only one signal on the cable at a time. The signals are in one of three states: one, zero, or idle.
Term
Bridge
Definition
A hardware device that connects two LAN segments of either the same or different topologies. Bridges look at the destination and source address of a network packet and decided whether to pass that packet on to the LAN segment. A bridge can used to filter out traffic for local and prevent it from being passed on to an unnecessary LAN segment.
Term
Broadband
Definition
A type of signaling that sends multiple signals (channels) over the cable at the same time. The best example of broadband signaling is cable television. The zero, one, and idle states exist on multiple channels on the same cable.
Term
Crossover Cable
Definition
Cable used to connect two computers together via NICs without the use of a hub.
Term
CSMA/CD
Definition
The acess method Ethernet systems use in local area networking technologies enabling packets of data to flow through the network ultimately to reach address locations.
Term
Fiber-optic cabling
Definition
A high-speed channel for transmitting data, made of high-purity glass sealed within an opaque tube. Much faster then conventional copper wire.
Term
Full Duplex
Definition
Describes any devices that can send and receive data simultaneously.
Term
half-duplex
Definition
Any device that at any given moment can either send or receive data, but not both.
Term
Hub
Definition
An electronic device that sits at the center of a star topology, providing a common point for the connection of network devices.
Term
LMHOST file
Definition
Special text file that helps map NetBIOS names to IP addresses.
Term
Mesh topology
Definition
Mes topology is not in common in computer networking. In mesh topologies, Every work station has a connection to every other component of the network.
Term
OSI Model
Definition
An architecture model based on the OSI protocol suite that defines and standardizes the flow of data between computers. It is broken up into 7 layers.
Term
Patch cable
Definition
Short(2-5ft) UTP cables that connect patch panels to hubs.
Term
Ring topology
Definition
A network that connects te computers in a circular fashion. If one computer fails they all fail.
Term
Router
Definition
A device that connects more then one physical network , or segments of a network, using IP routing software. As packets reach the router, the router reads them and forwards them to their destination or to another router.
Term
SC Connector
Definition
One of two special types of fiber-optic cables connectors used in 10BaseFL networks.
Term
Star Bus Topology
Definition
This is a hybrid of the star and bus topologies. This topology uses a physical star, where all the nodes connect to a single wiring point such as a hub, and a logical bus that maintains the Ethernet standards Provides good fault tolerance.
Term
Star Topology
Definition
All computers are directly cabled to a hub.
Term
Terminator
Definition
Any device that absorbs excess electrical signals off a wire. Example includes the device used at each end of a coaxial cable to absorb the excess electrical signal which prevent reflection or signal bounce.
Term
Unshielded Twisted pair UTP
Definition
A popular type of cabling for telephone and networks, composed of pairs of wires twisted around each other at specific intervals. The twist serve to reduce interference. The more twist, the less interference.
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