CompTIA Network+ All-in-One Exam Guide
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Application Log Tracks application events, such as when an application opens or closes Different types of application logs record different events Archive Bit An attribute of a file that shows whether the file has been backed up since the last change Each time a file is opened, changed, or saved, the archive bit is turned on Some types of backups turn off this archive bit to indicate that a good backup of the file exists on tape Area ID Address assigned to routers in an OSPF network to prevent flooding beyond the routers in that particular network See also OSPF (Open Shortest Path First) ARP PING A PING command that uses the ARP command instead of ICMP ARP PING won t cross any routers, so it will only work within a broadcast domain Asymmetric Digital Subscriber Line (ADSL) A fully digital, dedicated connection to the telephone system that provides download speeds of up to 9 Mbps and upload speeds of up to 1 Mbps Asymmetric-Key Algorithm An encryption method in which the key used to encrypt a message and the key used to decrypt it are different, or asymmetrical Asynchronous Transfer Mode (ATM) A network technology that runs at speeds between 25 and 622 Mbps using fiber-optic cabling or CAT 5 or better UTP Attenuation The degradation of signal over distance for a networking cable
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Authentication A process that proves good data traffic truly came from where it says it originated by verifying the sending and receiving users and computers Authentication, Authorization, and Accounting (AAA) A security philosophy wherein a computer trying to connect to a network must first present some form of credential in order to be authenticated, and then must have limitable permissions within the network The authenticating server should also record session information about the client Authentication Server (AS) In Kerberos, a system that hands out TicketGranting Tickets to clients after comparing the client hash to its own See also TicketGranting Ticket (TGT) Authoritative DNS Servers DNS servers that hold the IP addresses and names of systems for a particular domain or domains in special storage areas called forward lookup zones Authorization A step in the AAA philosophy during which a client s permissions are decided upon See also Authentication, Authorization, and Accounting (AAA) Automatic Private IP Addressing (APIPA) A networking feature in operating systems that enables DHCP clients to self-configure an IP address and subnet mask automatically when a DHCP server isn t available Autonomous System (AS) One or more networks that are governed by a single protocol within that AS, which provide routing for the Internet backbone
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Back Up To save important data in a secondary location as a safety precaution against the loss of the primary data Backup Designated Router A second router set to take over if the designated router fails See also Designated Router Backup Generator ity fails An onsite generator that provides electricity if the power util-
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Bandwidth A piece of the spectrum occupied by some form of signal, whether it is television, voice, fax data, and so forth Signals require a certain size and location of bandwidth to be transmitted The higher the bandwidth, the faster the signal transmission, thus allowing for a more complex signal such as audio or video Because bandwidth is a limited space, when one user is occupying it, others must wait their turn Bandwidth is also the capacity of a network to transmit a given amount of data during a given period Baseband Digital signaling that has only one signal (a single signal) on the cable at a time The signals must be in one of three states: one, zero, or idle Baseline Static image of a system s (or network s) performance when all elements are known to be working properly Basic Rate Interface (BRI) The basic ISDN configuration, which consists of two B channels (which can carry voice or data at a rate of 64 Kbps) and one D channel (which carries setup and configuration information, as well as data, at 16 Kbps) Basic Service Set (BSS) a given area In wireless networking, a single access point servicing Naming scheme in wireless networks
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