Network Terminology

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10 BASE T: The 10 Mbps base band Ethernet specification using 2 pairs of twisted – pair cabling. One pair transmits data and the other pair receives data. There is a distance limit 100 meters or over 328 feet per segment.

802.1: The IEEE standard protocol for VLAN trunking.

AAA: Authentication, Authorization & Accounting.

Authentication: Confirms the identity of the user or the device.
Authorization: Determines what the user or device is allowed to do.
Accounting: Keeps a record of attempts to access a particular site or database.

Access Link: The leased line between the frame relay DTE and DCE.

ACL: Access Control List. A list configured on a router to control packet flow through the router, such as to prevent packets with a certain IP Address from leaving a particular interface on the router.

AR: Access Rate. The speed at which the access link is clocked, this choice effects the connections price.

ADSL: Asymmetric Digital Subscriber Lines: Bandwidth Downstream (CO->CPE) > bandwidth upstream.

AppleTalk DDP: The AppleTalk Data Delivery Protocol (DDP) is the AppleTalk equivalent of the IP protocol. It defines 24 bit addresses with 16 bits defining the network and 8 bits defining the node.

ARP: Address Resolution Protocol: An Internet protocol used to map an IP address to a MAC address. (RFC 826)

Asynchronous: Both sides agree to the same speed, however there is no check or adjustment to the rate if there is a slight difference. 1 byte per transfer is sent.

ATM: Asynchronous Transfer Mode. The international standard for cell relay in Which multiple service types such as voice, video or data are conveyed in a fixed length, 53-byte cells. Fixed length cell processing to occur in hardware, thereby reducing the transit delays. ATM is designed to take advantage of high-speed transmission media such as E3, SONET and T3.

Auto-summarization: When advertised on an interface whose IP address is not in network X, routes related subnets in NETWORK X are
summarized and advertised as 1 route. That routes is for the entire class A, B or C network X. Auto-summarization is a feature of some IP routing protocols.

Auxiliary Port: A physical connector on a router that is designed to be used to allow A remote terminal, or PC with a terminal emulator, to access a Router using a analog modem.

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