Network + Guide to Networks, Chapter 7

Key terms

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Asymmetrical
Characteristic of a transmission tech that affords greater bandwidth in one direction than in the other direction
Asymmetrical DSL
A variation of DSL that offers more throughput when data travels downstream, downloading from a local carrier switching facility to the customer, then when it travels upstream uploading from the customer to the local carrier's switching facility
Asynchronous
Transmission method in which data being transmitted and received by nodes does not have to conform to any timing scheme. example a node can transmit at any time and the destination node must accept the transmission as it comes
ATM (asynchronous transfer mode)
A data link layer tech originally conceived in 1980 at bell labs and standardized by the ITU 1990 it relies on fixed packets, called cells that each consist of 48 bytes of of data plus a 5 byte header it relies on virtual circuits and establishes a connection before spending data. the reliable connection ensure by it allows network managers to specify Qo''s levels for certain types of traffic
Authentication
Process of comparing and matching a clients credentials with the credentials in the NOS user database to enable the client to log on to the network
B channel
In ISDN the bearer channel , so named because it bears traffic from point to point
Bonding
Process of combining more than one bearer channel of an ISDN line to increase throughput
BRI (basic Rate Interface)
Variety of ISDN that uses two 64 Kbps bearer channels and one 16 Kbps data channel as summarized by the notation 2B+D it is the most common form of ISDN employed by home users
Broadband cable
Method of connecting to the internet over a cable network with this cable computers are connected to a cable modem that modulates and demodulates signals to and from the cable company head-end
Bus topology WAN
WAN in which each location is connected to no more than two other locations in a serial fashion
Cable drop
Fiberoptic or coaxial cable that connects a neighbor hood cable node to a customer house
Cable modem
Device that modulates and demodulates signals for transmission and reception via cable wiring
CIR (committed information rate)
Guaranteed minimum amount of bandwidth selected when leasing a frame relay circuit frame relay cost are partially based on it
Cell
Packet of a fixed size consist of 48 bytes of data plus a 5 byter header
CO (CENTRAL OFFICE)
Location where a local or long distance telephone service provider terminates and interconnects customer lines