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30 Cards in this Set

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  • Back
A record of how well the network operates under normal conditions (including its performance, collision rate, utilization rate, and so on). Baselines are used for comparison when conditions change.
A simple handheld device that determines whether cabling can provide connectivity. To accomplish this task, a cable checker applies a small voltage to each conductor at one end of the cable, then checks whether that voltage is detectable at the other end. It may also verify that voltage cannot be detected on other conductors in the cable.
cable checker
A handheld device that not only checks for cable continuity, but also ensures that the cable length is not excessive, measures the distance to a cable fault, measures attenuation along a cable, measures near-end crosstalk between wires, measures terminations resistance and impedance for Thinnet cabling, issues pass/fail ratings for wiring standards, and stores and prints cable testing results.
cable tester
A software program used to document problems (also known as help desk software). Examples of popular call tracking systems include Clientele, Expert Advisor,Professional Help Desk, Remedy, and Vantive.
call tracking system
A process or program that provides support personnel with a centralized means of documenting changes made to the network. In smaller organizations, a change management system may be as simple as one document on the network to which networking personnel continually add entries to mark their changes. In larger organizations, it may consist of a database package complete with graphical interfaces and customizable field tailored to the particular computing environment.
Change management system
Frames that are not actually data frames, but rather aberrations caused by a repeater misinterpreting stray voltage on the wire. Unlike true data frames, ghosts have no starting delimiter.
Packets that exceed the mediums's maximum packet size. For example, any Ethernet packet that is larger than 1518 bytes is considered a giant.
A device that handles electrical signals improperly, usually affecting the rest of the network. A network analyzer will detect a jabber as a device that is always retransmitting, effectively bringing the network to a halt. A jabber usually results from a bad NIC. Occasionally, it can be caused by outside electrical interference.
Novell's network monitoring software package. LANalyzer can act as a stand-alone program on Window 9x or 2000 workstation or as part of the Manage Wise suite of network management tools on a Netware server. LANalyzer offers the following capabilities: discovery of all network nodes on a segment, continuous monitoring of network traffic, alarms that are tripped when traffic conditions meet preconfigured thresholds (for example, if usage exceeds 70%), and the capturing of traffic to and from all or selected nodes.
Collisions that take place outside the normal window in which collisions are detected and redressed. Late collisions are usually caused by a defective state (such as a card, or transceiver) that is transmitting without first verifying line status or by failure to observe the configuration guidelines for cable length, which results in collisions being recognized too late.
late collision
Collisions that occur when two or more stations are transmitting simultaneously. Excessively high collision rates within the network can usually be traced to cable or routing problems.
local collision
A simple instrument that can measure multiple characteristics of an electric circuit, including its resistance and voltage.
The result of the cyclic redundancy checksum (CRC) generated by the originating node not matching the checksum calculated from the data received. It usually indicates noise or transmission problems on the LAN interface or cabling. A high number of (nonmatching) CRCs usually results from excessive collisions or a station transmitting bad data.
negative frame sequence checks
A software-based tool that continually monitors traffic on the network from a server or workstation attached to the network. Network monitors typically can interpret up to Layer 3 of the OSI Model.
network monitor
A software-based network monitoring tool that comes with NT Server 4.0 or Windows 2000. Its capabilities include capturing network data traveling from one or many segments, capturing frames sent by or to a specified node, reproducing network conditions by transmitting a selected amount and type of data, detecting any other running copies of NetMon, and generating statistics about network activity.
Network Monitor (NetMon)
A device use to measure resistance in an electrical circuit.
The feature of a network adapter card that allows a device driver to direct it to pick up all frames that pass over the network--not just those destined for the node served by the card.
promiscuous mode
A portable, hardware-based tool that a network manager connects to the network expressly to determine the nature of network problems. Network analyzers can typically interpret data up to Layer 7 of the OSI Model.
network analyzer and protocol analyzer
The opposition to an electric current. Resistance of a wire is a factor of its size and molecular structure.
Packets that are smaller than the mediums's minimum packet size. For instance, and Ethernet packet that is smaller than 64 bytes is considered a runt.
A laptop equipped with a special network adapter and software that performs network analysis. Unlike laptops that may have a network monitoring tool installed, sniffers typically cannot be used for other purposes, because they don't depend on a desktop operating system such as Windows.
Sniffer Portable
A single (or short-lived) jump in a measure of network performance, such as utilization.
A document (preferably online) that lists every service and software package supported within an organization, plus the names of first- and second-level support contacts for those services or software packages.
supported service list
A high-end instrument for testing the qualities of a cable. It works by issuing a signal on a cable and measuring the way in which the signal bounces back (or reflects to the TDR)
time domain reflector (TDR)
A small electronic device that issues a signal on a wire pair. When used in conjunction with a tone locator, it can help locate the termination of a wire pair.
tone generator
A small electronic device that emits a tone when it detects electrical activity on a wire pair. When used in conjunction with a tone generator, it can help locate the termination of a wire pair.
tone locator
A device used to measure voltage (or electrical pressure) on an electrical circuit.
A high-end instrument for testing the qualities of a cable. It works by issuing a signal on a cable and measuring the way in which the signal bounces back (or reflects to the TDR)
time domain reflector (TDR)
Another term for the combination of devices known as a tone generator and a tone locator. The tone locator is considered the hound because it follows the tone generator (the fox)
fox and hound
A time domain reflector specifically made for use with fiber-optic networks. It works by issuing a light-based signal on a fiber-optic cable and measuring the way in which the signal bounces back (or reflects)to the OTDR.
optical time domain reflectometer (OTDR)