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| A data transmission path through one or more networks between two end nodes. |
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| The cost in time and resources to send a data packet over that route. |
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| A route that is manually configured on a router. Includes destination IP, subnet mask, and next-hop-IP (or outgoing interface). Route remains static/unchanged unless reconfigured. |
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| On a router, the route that is considered to match all packets that are not otherwise matched by some more specific route. |
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| A route that the router learns from neighboring routers. |
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| A set of messages and processes with which routers can exchange information about routes to reach subnets in a particular network. Examples of routing protocols include the Enhanced Interior Gateway Routing Protocol (EIGRP), the Open Shortest Path First (OSPF) protocol, and the Routing Information Protocol (RIP). |
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| Routing Information Protocol |
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| Routing Information Protocol |
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Definition
| An Interior Gateway Protocol (IGP) that uses distance vector logic and router hop count as the metric. RIP Version 1 (RIP-1) has become unpopular, with RIP Version 2 (RIP-2) providing more features, including support for VLSM. |
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| Enhanced Interior Gateway Router Protocol |
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| Enhanced Interior Gateway Router Protocol (EIGRP) |
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Definition
| An advanced distance-vector routing protocol, with optimizations to minimize both the routing instability incurred after topology changes, as well as the use of bandwidth and processing power in the router. Routing information is exchanged only upon the establishment of new neighbor adjacencies, after which only changes are sent. |
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| An adaptive routing protocol which uses a link state routing algorithm and operates within a single autonomous system (AS). It gathers link state information from available routers and constructs a topology map of the network. The topology determines the routing table presented to the Internet Layer which makes routing decisions based solely on the destination IP address found in IP packets. |
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| Intermediate System to Intermediate System Routing Protocol |
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| Intermediate System to Intermediate System Routing Protocol |
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| An interior gateway protocol, designed for use within an administrative domain or network. It is a link-state routing protocol, operating by reliably flooding link state information throughout a network of routers. Each ___ router independently builds a database of the network's topology, and packets (datagrams) are forwarded, based on the computed ideal path, through the network to the destination. |
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| In Cisco routers, a means for one router to choose between multiple routes to reach the same subnet when those routes were learned by different routing protocols. The lower the _____, the better the source of the routing information. |
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| A unit of measure used by routing protocol algorithms to determine the best route for traffic to use to reach a particular destination. |
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| variable-length subnet masking |
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| variable-length subnet masking |
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| The capability to specify a different subnet mask for the same Class A, B, or C network number on different subnets. ____ can help optimize available address space. |
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| Interior Gateway Protocol |
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| Interior Gateway Protocol |
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| A routing protocol that was designed and intended for use inside a single autonomous system. |
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| Exterior Gateway Protocol |
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| Exterior Gateway Protocol |
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| A routing protocol that was designed and intended for use between different autonomous systems. |
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| An internetwork in the administrative control of one organization, company, or governmental agency, inside which that organization typically runs an Interior Gateway Protocol (IGP). |
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| A protocol that is used to exchange routes between routers in different autonomous systems. It is an EGP |
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| A term that refers to a general type of routing protocol algorithm, the other two being distance vector and link state. The Enhanced Interior Gateway Routing Protocol (EIGRP) is the only routing protocol that Cisco classifies as using a ______ algorithm. |
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| classful routing protocol |
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Definition
| Does not transmit the mask information along with the subnet number, and therefore must consider Class A, B, and C network boundaries and perform autosummarization at those boundaries. Does not support VLSM. |
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| classless routing protocol |
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Definition
| An inherent characteristic of a routing protocol, specifically that the routing protocol does send subnet masks in its routing updates, thereby removing any need to make assumptions about the addresses in a particular subnet or network, making it able to support VLSM and manual route summarization. |
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| The time required for routing protocols to react to changes in the network, removing bad routes and adding new, better routes so that the current best routes are in all the routers’ routing tables. |
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| The logic behind the behavior of some interior routing protocols, such as RIP. ______ routing algorithms call for each router to send its entire routing table in each update, but only to its neighbors. ______ routing algorithms can be prone to routing loops but are computationally simpler than linkstate routing algorithms. |
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| A classification of the underlying algorithm used in some routing protocols. ______ protocols build a detailed database that lists links (subnets) and their state (up, down), from which the best routes can then be calculated. |
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| A generic reference to any routing protocol’s messages in which it sends routing information to a neighbor. |
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