A


Access Point

A transmitter and receiver (transceiver) device commonly used to facilitate communication between a wireless client and a wired network. Wireless APs are use with the wireless infrastructure network topology to provide a connection point between WLANs and a wired Ethernet LAN.



ACK

The acknowledgment message sent between two hosts during a TCP session.



ACL (access control list)

The list of trustees assigned to a file or directory. A trustee can be any object available to the security subsystem. The term ACL is also used with routers and firewall systems to refer to the list of permitted computers or users.



Active Directory

An X.500-compliant directory service used on Windows networks.



active hub

A hub that has power supplied to it for the purposes of regenerating the signals that pass through it.



active termination

A termination system used on a SCSI bus. Unlike passive termination, which uses voltage resistors, active termination uses voltage regulators to create the termination voltage.



address

A set of numbers, used to identify and locate a resource or device on a network. An example may be an IP address such as 192.168.2.1.



ad hoc topology

Defines a wireless network layout whereby devices communicate directly between themselves without using an access point. Sometimes called an unmanaged or peer-to-peer wireless topology.



administrator

A person who is responsible for the control and security of the user accounts, resources, and data on a network.



Administrator account

On a Windows system, the default account that has rights to access everything and to assign rights to other users on the network. Unlike other user accounts, the Administrator account cannot be deleted.



ADSL (Asymmetric Digital Subscriber Line)

A service that transmits digital voice and data over existing (analog) phone lines.



AFP (Apple File Protocol)

File sharing and access protocol implemented in Apple networks. AFP can be implemented over TCP/IP (AppleTalk over IP)



ANSI (American National Standards Institute)

An organization that publishes standards for communications, programming languages, and networking.



antivirus software

A software application that detects and removes virus programs.



APIPA (Automatic Private IP Addressing)

Technology implemented on certain Windows platforms through which a system will assign itself an IP address in the absence of a DHCP server. Addresses are assigned from the 169.254.x.x address range.



application layer

Layer 7 of the OSI model, which provides support for end users and for application programs that are using network resources.



Application log

A log file on a Windows system that provides information on events that occur within an application.



archive bit

A flag that is set on a file after it has been created or altered. Some backup methods reset the flag to indicate that it has been backed up.



ARP (Address Resolution Protocol)

A protocol in the TCP/IP protocol suite that is used to resolve IP addresses to MAC addresses. Specifically, the ARP command returns a layer 2 address for a layer 3 address.



ARP table

A table of entries used by ARP to store resolved ARP requests. Entries can also be stored manually.



array

A group of devices arranged in a fault-tolerant configuration.

See also [RAID]


attenuation

The loss of signal strength that is experienced as data is transmitted over distance and across the network media.



authentication

The process by which a user's identity is validated on a network. The most common authentication method is a username and password combination.





    Network+ Exam Cram 2
    Network+ Exam Cram 2
    ISBN: 078974905X
    EAN: N/A
    Year: 2003
    Pages: 194

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