Vocabulary Flashcards
10BASE-T
The 10-Mbps baseband Ethernet specification using two pairs of twisted pair cabling (CAT III IV or V). One pair transmits data and the other receives data. 10BASE-T, which is part of the IEEE 802.3 specification, has a distance limit of approximately 100m per segment.
100BASE-T
A name for the IEEE Fast Ethernet standard that used two-pair copper cabling, a speed of 100 Mbps, and a maximum cable length of 100 m.
1000BASE-T
A name for the IEEE Gigabit Ethernet standard that uses four-pair copper cabling, a speed of 1000 Mbps (1 Gbps), and a maximum cable length of 100 m.
802.1Q
The IEEE standardized protocol for VLAN trunking.
802.11a
The IEEE standard for wireless LANs using the U-NII spectrum, OFDM encoding, at speeds up to 54 Mbps
802.11b
The IEEE standard for wireless LANs using the ISM spectrum, DSSS encoding, and speeds up to 11 Mbps
802.11g
The IEEE standard for wireless LANs using the ISM spectrum, OFDM or DSSS encoding and speeds of up to 54 Mbps.
802.11n
The IEEE standard for wireless LANs using the ISM spectrum, OFDM encoding, and multiple antennas for single-stream speeds up to 150 Mbps.
AAA
Authentication, authorization and accounting. Authentication confirms the identity of the user or device. Authorization determines what the user or device is allowed to do. Accounting records information about access attempts, including inappropriate requests.
Access Interface
A LAN network design term that refers to a switch interface connected to end-user devices, configured so that it does not use VLAN trunking.
Access Link
In Frame Relay, the physical serial link that connects a Frame Relay DTE device, usaully at router, to a Frame Relay switch. The access link uses the same physical layer standards as do point-to-point leased lines.
Access Point
a wireless LAN device that provides a means for wireless clients to send data to each other and to the rest of a wired network, with the AP connecting to both the wireless LAN and the wired Ethernet LAN.
Accounting
In security, the recording of access attempts. See AAA.
Address Block
In both IPv4 and IPv6, a set of consecutive addresses. This term is typically used for public addresses, assigned by some numbering authority (IANA/ICANN, an RIR, or an ISP).
Adjacent-Layer Interaction
The general topic of how on one computer, two adjacent layers in a networking architectural model work together, with the lower layer providing services to the higher layer.
Administrative Distance
In Cisco routers, a means for one router to chose between multiple routes to reach the same subnet when those routes were learned by different routing protocols. The lower the administrative distance, the better the source of the routing information.
ADSL
Asymmetric digital subscriber line. One of many DSL technologies, ADSL is designed to deliver more bandwidth down-stream (from the central office to the customer site) than upstream.
All-Nodes Multicast Address
A specific IPv6 multicast address, FF02::1, with link-local scope, used to send packets to all devices on the link that support IPv6.
All-Routers Mulitcast Address
A specific IPv6 multicast address, FF02::2, with a link-local scope, used to send packets to all devices that act as IPv6 routers on the local link.
Anti-X
The term used by Cisco to refer to a variety of security tools that help prevent various attacks, including antivirus, antiphishing, and antispam.
Area Border Router (ABR)
A router using OSPF in which the router has interfaces in multiple OSPF areas
ARP
Address Resolution Protocol. An Internet protocol used to map an IP address to a MAC address. Defined in RFC 826.
ARP table
A list of IP addresses of neighbors on the same VLAN, along with their MAC addresses, as kept in memory by hosts and routers.
ARPANET
The first packet-switched network, first created around 1970, which served as the predecessor to the Internet.