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Term: 100BaseT
ID: 11899
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: 100-Mbps baseband Fast Ethernet specification using UTP wiring. Like the 10BaseT technology on which it is based, 100BaseT sends link pulses over the network segment when no traffic is present. However, these link pulses contain more information than those used in 10BaseT. Based on the IEEE 802.3 standard. See also Fast Ethernet and IEEE 802.3.

Term: 3DES
ID: 33796
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: See DES.

Term: A record address
ID: 33797
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: "A" stands for address, and refers to name-to-address mapped records in DNS.

Term: AAA
ID: 33798
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: Authentication, authorization, and accounting. See also TACACS+ and RADIUS.

Term: AAL
ID: 11900
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: ATM adaptation layer. Service-dependent sublayer of the data link layer. The AAL accepts data from different applications and presents it to the ATM layer in the form of 48-byte ATM payload segments. AALs consist of two sublayers, convergence sublayer (CS) and segmentation and reassembly (SAR). AALs differ on the basis of the source-destination timing used, whether they use CBR or VBR, and whether they are used for connection-oriented or connectionless mode data transfer. At present, the four types of AAL recommended by the ITU-T are AAL1, AAL2, AAL3/4, and AAL5. See AAL1, AAL2, AAL3/4, AAL5, CS, and SAR. See also ATM and ATM layer.

Term: AAL1
ID: 11901
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: ATM adaptation layer 1. One of four AALs recommended by the ITU-T. AAL1 is used for connection-oriented, delay-sensitive services requiring constant bit rates, such as uncompressed video and other isochronous traffic. See also AAL.

Term: AAL2
ID: 11902
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: ATM adaptation layer 2. One of four AALs recommended by the ITU-T. AAL2 is used for connection-oriented services that support a variable bit rate, such as some isochronous video and voice traffic. See also AAL.

Term: AAL3/4
ID: 11903
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: ATM adaptation layer 3/4. One of four AALs (merged from two initially distinct adaptation layers) recommended by the ITU-T. AAL3/4 supports both connectionless and connection-oriented links, but is primarily used for the transmission of SMDS packets over ATM networks. See also AAL.

Term: AAL5
ID: 11904
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: ATM adaptation layer 5. One of four AALs recommended by the ITU-T. AAL5 supports connection-oriented, VBR services, and is used predominantly for the transfer of classical IP over ATM and LANE traffic. AAL5 uses SEAL and is the least complex of the current AAL recommendations. It offers low bandwidth overhead and simpler processing requirements in exchange for reduced bandwidth capacity and error-recovery capability. See also AAL.

Term: ABR
ID: 11905
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: Available bit rate. QOS class defined by the ATM Forum for ATM networks. ABR is used for connections that do not require timing relationships between source and destination. ABR provides no guarantees in terms of cell loss or delay, providing only best-effort service. Traffic sources adjust their transmission rate in response to information they receive describing the status of the network and its capability to successfully deliver data. Compare with CBR, UBR, and VBR.

Term: ABR
ID: 33799
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: Area Border Router. In OSPF, a router with interfaces in multiple areas.

Term: access list
ID: 11080
Source: GeekGlossary.com (v1)
Date Added: 05/23/03
Definition: A list kept by routers to control access through or to the router for a number of services (for example, to prevent packets with a certain IP address from leaving a particular interface on the router).

Term: access list
ID: 11081
Source: GeekGlossary.com (v1)
Date Added: 05/23/03
Definition: A list kept by routers to control access through or to the router for a number of services (for example, to prevent packets with a certain IP address from leaving a particular interface on the router).

Term: Access Modes
ID: 33800
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: The security appliance CLI uses several command modes. The commands available in each mode vary. See also user EXEC mode, privileged EXEC mode, global configuration mode, command-specific configuration mode.

Term: ACE
ID: 33801
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: Access Control Entry. Information entered into the configuration that lets you specify what type of traffic to permit or deny on an interface. By default, traffic that is not explicitly permitted is denied.

Term: ACL
ID: 33802
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: Access Control List. A collection of ACEs. An ACL lets you specify what type of traffic to allow on an interface. By default, traffic that is not explicitly permitted is denied. ACLs are usually applied to the interface which is the source of inbound traffic. See also rule, outbound ACL.

Term: active monitor
ID: 11906
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: Device responsible for managing a Token Ring. A network node is selected to be the active monitor if it has the highest MAC address on the ring. The active monitor is responsible for such management tasks as ensuring that tokens are not lost, or that frames do not circulate indefinitely. See also ring monitor and standby monitor.

Term: active port monitor
ID: 11907
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: A type of monitoring supported by the Switched Port Analyzer (SPAN) that allows you to monitor traffic using a customer-supplied monitoring device, such as an RMON probe, or a trace tool, such as a Network General Sniffer. The trace tool monitors only the LLC traffic that is switched by the monitored port. The MAC frames are not monitored. See also SPAN.

Term: ActiveX
ID: 33803
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: A set of object-oriented programming technologies and tools used to create mobile or portable programs. An ActiveX program is roughly equivalent to a Java applet.

Term: adaptive cut-through switching
ID: 11908
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: A switching feature that alternates between cut-through and store-and-forward switching modes based on preset, user-defined error thresholds to optimize performance while providing protection from network errors.

Term: address mask
ID: 11909
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: Bit combination used to describe which portion of an address refers to the network or subnet and which part refers to the host. Sometimes referred to simply as mask. See also subnet mask.

Term: address resolution
ID: 11910
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: Generally, a method for resolving differences between computer addressing schemes. Address resolution usually specifies a method for mapping network layer (Layer 3) addresses to data link layer (Layer 2) addresses.

Term: Address Resolution Protocol
ID: 11911
Source: GeekGlossary.com (v1)
Date Added: 12/11/05
Definition: See ARP.

Term: Address Resolution Protocol
ID: 33804
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: See ARP.

Term: address translation
ID: 33805
Source: Cisco Security Appliance CLI Guide (8.0)
Date Added: 08/29/14
Definition: The translation of a network address and/or port to another network address/or port. See also IP address, interface PAT, NAT, PAT, Static PAT, xlate.

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