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Address Resolution Protocol that is used for mapping an IP address to a hardware media address.
Autonomous System
An internetwork in which interior routing protocols are used to control routing.
A portion of an internetwork used for transit of information between networks.
Border Gateway Protocol is typically defined by the service provider. In general, border protocols are only required when you have moe than one link to the same exterior network such as the Internet.
Border Routing
Used for connections between different autonomous systems.
Recalculation of routing tables when a change in topology occurs.
Distance Vector
A form of routing protocol that maintains a table of routing values based on their calculated distance.
Dynamic Routing
Routing that changes by itself as the internetwork changes.
Exterior Gateway Protocol
Enhanced Internet Gateway Routing Protocol is a Cisco-only solution to having a tunable means to sequeeze every bit of performance out of your WAN. EIGRP supports VLSM and the lck of transitory networks makes an address saver for some nets. Non-Cisco routers will not work with this protocol. A mix will require static routes or routers running a combination of RIP and EIGRP, which basically defeats the purpose of running EIGRP.
Gateway to Gateway Protocol
Interior-Domain Routing Protocol
Interior Gateway Protocol
Internet Gateway Routing Protocol developed in 1988 dealt with problems using RIP. IGRP provide an intelligent routing protocol by taking bandwidth and latency into effect. It was replaced by its enhanced product, entitled EIGRP.
Interior Routing
Routing within an autonomous system, typically controlled by one organization.
Link State
A form of routing protocol that monitors the status of the various links. Each router keeps a map of the network in its link state database.
Matrix Network
A network with two or more discontiguous backbone areas.
Open Shortest Path First is a cross-platform, standard interior routing protocol today. Its hierarchical organization is a great solution, and it also has protocol-level security to prevent routing information attacks. OSPF for IPv6 is already in the design stages, which indicates that it will be used on interior routers for some time to come.
Path Vector
A form of routing protocol that maintains a database of different paths between individual autonomous systems.
Routing Information Protocol is designed for small networks. It has a slow convengence and a lack of loop prevention, which means you may be better off with a newer or cross platform protocol such as OSPF. RIP also does not handle VLSMs.
Routing Table
A database maintained on every router with information on paths to different networks.
Source Demand Routing Protocol
Static Routing
A form of routing that has permanent routes between networks programmed into every route.
Variable Length Subnet Masks do not follow those used by Class A, B, and C networks.

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Date of Last Revision: 21 December 2001
Extracted from: InfoWorld Magazine, September 8, 1997