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| the process of directing packets between networks or subnets |
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| when each router uses entries in a routing table, as well as various metrics |
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| route discovery operations to build and update routing tables themselves |
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| administrators manually add routing entries to configure files, which routers load when they start up |
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| dynamic routing is useful, especially in |
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| larger network environments |
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| advantage of dynamic routing |
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| if a network suffers from a router or link failure routers can automatically detect the problem and advertise that the affected route or routes are no longer valid |
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| is the state of router on a internetwork that all have the same, consistent topology and route information |
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| time for a set of routers to recover to a consistent view of the internetworks after the topology change |
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| each router passes a copy of its routing table to its neighbors, and maintains a table minimum distances to every node |
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| routing information protocol (RIP) |
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| selects the one with the lowest metric |
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| alternatives to the distance-vector routing |
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| link-state routing and path-vector routing |
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| keeps track of the routes from itself to each data destination |
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| instead of recording a route to each individual node, path vector routing can treat an entire autonomous system, as ? |
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| Border or exterior routers |
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| pass routing information to the next AS in a chain. |
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| broadcast small updates, and converge quickly |
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| example of the link-state protocol is |
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| Open Shortest Path First (OPSF) protocol |
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| both distance-vector and link-state routing use |
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| routing Information protocol (RIP) |
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| a distance-vector routing protocol that's easy to configure, works well in simple autonomous systems, and is best deployed in small business |
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enhances RIP by supporting the following features:
—Next Hop Addressing:
—Authentication:
—Subnet mask:
—Multicast addressing: |
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| border gateway protocol (BGP) |
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| is a path-vector routing protocol used to established routing between internet service provides (ISPs). |
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| Interior gateway routing protocol (IGRP) |
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Definition
| distance-vector protocol routing protocol developed by Cisco to improve RIP and RIPv2 |
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| Enhanced Interior Gateway routing protocol (EIRGP) |
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Definition
| considered a hybrid protocol. it includes features that support VSLM, and both classful and classless subnet mask |
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| Open Shortest Path First (OSPF) |
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Definition
| this router uses the information in its database to build the shortest possible path to each destination on a network |
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| Intermediate system to intermediate system (IS-IS) |
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| a link-state protocol, support more router than OSPF and doesn't require that a specific type of network address be used |
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| occurs if two routers identify one another as the next point in a path to a particular destination |
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| is a content-based network on which a group of nodes are allowed to compete with each other for media access |
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| logical area in a computer network, where any node connected to the computer network can directly transmit to any other node in the domain without having to go through a central routing device |
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| specify how routers communicate with one another and how they share information on network topology and available routes |
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| IGP (interior gateway protocol) |
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| routing protocols that govern the exchanged of routing information between routers within an autonomous system |
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| is a self-contain network of routers and devices |
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| EGP (exterior gateway protocol) |
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| routing protocols that handle the exchanged of routing information between autonomous system. |
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| collection of networks under one administrative control that has a define routing policy |
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| two main categories of IGPs |
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Definition
| distance-vector protocols, and link-state protocols |
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| examples of distance - vector protocols |
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| connects all of the autonomous systems on the internet |
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| border gateway protocol (BGP) |
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