CCNA Cisco Certified Network Associate Study Guide - FTP Server

Glossary 659
BGP4 BGP Version 4: Version 4 of the interdomain routing protocol most
commonly used on the Internet. BGP4 supports CIDR and uses routecounting
mechanisms to decrease the size of routing tables. See also: CIDR.
binary A two-character numbering method that uses ones and zeros. The
binary numbering system underlies all digital representation of information.
BIP Bit Interleaved Parity: A method used in ATM to monitor errors on a
link, sending a check bit or word in the link overhead for the previous block
or frame. This allows bit errors in transmissions to be found and delivered as
maintenance information.
BISDN Broadband ISDN: ITU-T standards created to manage highbandwidth
technologies such as video. BISDN presently employs ATM technology
along SONET-based transmission circuits, supplying data rates
between 155Mbps and 622Mbps and beyond. Contrast with N-ISDN. See
also: BRI, ISDN, and PRI.
bit-oriented protocol Regardless of frame content, the class of Data-Link
layer communication protocols that transmits frames. Bit-oriented protocols,
as compared with byte-oriented, supply more efficient and trustworthy,
full-duplex operation. Compare with: byte-oriented protocol.
Boot ROM Used in routers to put the router into bootstrap mode. Bootstrap
mode then boots the device with an operating system. The ROM can
also hold a small Cisco IOS.
border gateway A router that facilitates communication with routers in
different autonomous systems.
BPDU Bridge Protocol Data Unit: A Spanning-Tree Protocol initializing
packet that is sent at definable intervals for the purpose of exchanging information
among bridges in networks.
BRI Basic Rate Interface: The ISDN interface that facilitates circuitswitched
communication between video, data, and voice; it is made up of
two B channels (64Kbps each) and one D channel (16Kbps). Compare with:
PRI. See also: BISDN.