Glossary
ACL
An Access Control List is a mechanism for filtering packets at the hardware level. Packets can be
classified by characteristics such as the source or destination MAC, IP address, IP type, or QoS (Quality
of Service) queue. Once classified, the packets can be forwarded, counted, queued, or dropped.
ad-hoc mode
An 802.11 networking framework in which devices or stations communicate directly with each other,
without the use of an AP.
AP
In wireless technology, Access Points are LAN transceivers or "base stations" that can connect to the
regular wired network and forward and receive the radio signals that transmit wireless data.
ARP
Address Resolution Protocol is part of the TCP/IP suite used to dynamically associate a device's physical
address (MAC address) with its logical address (IP address). The system broadcasts an ARP request,
containing the IP address, and the device with that IP address sends back its MAC address so that trac
can be transmitted.
AS
In OSPF (Open Shortest Path First)
, an Autonomous System is a connected segment of a network
topology that consists of a collection of subnetworks (with hosts attached) interconnected by a set of
routes. The subnetworks and the routers are expected to be under the control of a single administration.
Within an AS, routers may use one or more interior routing protocols and sometimes several sets of
metrics. An AS is expected to present to other autonomous systems an appearance of a coherent
interior routing plan and a consistent picture of the destinations reachable through the AS. An AS is
identified by a unique 16-bit number.
ATM
Asynchronous Transmission Mode is a start/stop transmission in which each character is preceded by a
start signal and followed by one or more stop signals. A variable time interval can exist between
characters. ATM is the preferred technology for the transfer of images.
backbone area
In OSPF (Open Shortest Path First), a network that has more than one area must have a backbone area,
configured as 0.0.0.0. All areas in an Autonomous System (AS) must connect to the backbone area.
BGP
Border Gateway Protocol is a router protocol in the IP suite designed to exchange network reachability
information with BGP systems in other autonomous systems. You use a fully meshed configuration with
BGP.
BGP provides routing updates that include a network number, a list of ASs that the routing information
passed through, and a list of other path attributes. BGP works with cost metrics to choose the best
available path; it sends updated router information only when one host has detected a change, and only
the aected part of the routing table is sent.
ISW Series Managed Industrial Ethernet Switch Command Reference Guide 152
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