Network+

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10BaseFL An implementation of Ethernet that specifies a 10Mbps signaling rate, baseband signaling, and fiber-optic cabling.


10BaseT An implementation of Ethernet that specifies a 10Mbps signaling rate, baseband signaling, and twisted-pair cabling.


100BaseVG Star topology using round-robin for allowing systems to transmit data on the network.


100VG (Voice Grade) IEEE 802.12 standard for 100BaseVG networks.


100VGAnyLAN A networking technology that runs 100-Megabit Ethernet over regular (Cat 3) phone lines. It hasn’t gained the industry acceptance that 100BaseT has. See also AnyLAN.


access control list (ACL) List of rights that an object has to resources in the network. Also a type of firewall. In this case, the lists reside on a router and determine which machines can use the router and in what direction.


ACK See acknowledgment.


acknowledgment (ACK) A message confirming that the data packet was received. This occurs at the Transport layer of the OSI model.


ACL See access control list.


Active Directory The replacement for NT Directory Service (NTDS) that is included with Windows 2000. It acts similarly to NDS (Novell Directory Services) because it is a true X.500-based directory service.


active hub A hub that is powered and actively regenerates any signal that is received. See also hub.


active monitor Used in Token Ring networks, a process that prevents data frames from roaming the ring unchecked. If the frame passes the active monitor too many times, it is removed from the ring. Also ensures that a token is always circulating the ring.

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