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Bonding Two or more NICs in a system working together to act as a single NIC to increase performance BOOTP (Bootstrap Protocol) A component of TCP/IP that allows computers to discover and receive an IP address from a DHCP server prior to booting the OS Other items that may be discovered during the BOOTP process are the IP address of the default gateway for the subnet and the IP addresses of any name servers Border Gateway Protocol (BGP-4) An exterior gateway routing protocol that enables groups of routers to share routing information so that efficient, loop-free routes can be established Botnet A group of computers under the control of one operator, used for malicious purposes Bps (Bits Per Second) A measurement of how fast data is moved across a transmission medium A Gigabit Ethernet connection moves 1,000,000,000 bps Bridge A device that connects two networks and passes traffic between them based only on the node address, so that traffic between nodes on one network does not appear on the other network For example, an Ethernet bridge only looks at the MAC address Bridges filter and forward packets based on MAC addresses and operate at Level 2 (Data Link layer) of the OSI seven-layer model Bridge Loop A negative situation in which bridging devices (usually switches) are installed in a loop configuration, causing packets to loop continuously Switches using Spanning Tree Protocol (STP) prevent bridge loops by automatically turning off looping ports Bridged Connection An early type of DSL connection that made the DSL line function the same as if you snapped an Ethernet cable into your NIC Broadband Analog signaling that sends multiple signals over the cable at the same time The best example of broadband signaling is cable television The zero, one, and idle states (see Baseband) exist on multiple channels on the same cable Broadcast cast domain A packet addressed to all machines, almost always limited to a broad-.

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access interactive Web-based applications that provide immediate, open access to Cisco information, resources, and systems This support and information is available 24 hours a day, seven days a week Figure D-5 shows the CCO interface Features of CCO include the following:

Broadcast Address The address a NIC attaches to a frame when it wants every other NIC on the network to read it In TCP/IP, the general broadcast address is 255255255255 In Ethernet, the broadcast MAC address is FF-FF-FF-FF-FF-FF Broadcast Domain A network of computers that will hear each other s broadcasts The older term collision domain is the same, but rarely used today Browser A software program specifically designed to retrieve, interpret, and display Web pages Building Entrance Location where all the cables from the outside world (telephone lines, cables from other buildings, and so on) come into a building

Bus Topology A network topology that uses a single bus cable that connects all of the computers in line Bus topology networks must be terminated to prevent signal reflection Butt Set Device that can tap into a 66- or 110-punchdown block to see if a particular line is working Byte Eight contiguous bits, the fundamental data unit of personal computers Storing the equivalent of one character, the byte is also the basic unit of measurement for computer storage Bytes are counted in powers of two CAB Files Short for cabinet files These files are compressed and most commonly used during Microsoft operating system installation to store many smaller files, such as device drivers Cable Certifier A very powerful cable testing device used by professional installers to test the electrical characteristics of a cable and then generate a certification report, proving that cable runs pass TIA/EIA standards Cable Drop location Location where the cable comes out of the wall at the workstation

Figure D-5: Cisco's portal to its information stores On-demand access to Cisco information, service and support resources, and systems The latest downloadable upgrades, Cisco software registration Assistance with design, implementation, and support of Cisco technologies through the comprehensive suite of Internet Technical Support Applications A variety of online commerce transactions, including purchase of Cisco networking products, services, merchandise, training kits and modules, brochures, and technical documents

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Cable Modem A bridge device that interconnects the cable company s DOCSIS service to the user s Ethernet network In most locations, the cable modem is the demarc Cable Stripper Device that enables the creation of UTP cables

There are two levels of access to CCO: contract and noncontract Although each level is fundamentally similar, the contract level of access has several additional perks

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