TO 7.2.2: Routing Protocol Characteristics Facts.pdf

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11/8/2017 TestOut LabSim 1/2 7.2.2 Routing Protocol Characteristics Facts Routers use a routing protocol to exchange information about known routes with other routers. The following table describes general characteristics of a routing protocol: Characteristic Description Scope Each organization that has been assigned a network address from an ISP is considered an Autonomous System (AS). The organization is then free to create one large network or divide the network into subnets. Each autonomous system is identified by an AS number (ASN). This number can be locally administered (private ASN) or publicly registered (public ASN) if the AS is connected to the Internet. Routing protocols can be classified based on their scope , or whether traffic is routed within or between an autonomous system. An Interior Gateway Protocol (IGP) routes traffic within an autonomous system. An Exterior Gateway Protocol (EGP) routes traffic between autonomous systems. Metric The metric is a value assigned to each route that identifies the distance or cost to the destination network. The metric is used by the routing protocol to identify and select the best route to the destination when multiple routes exist. A lower metric identifies a more preferred route. The metric can be calculated based on the following criteria: Hop count is the number of routers between the current router and the destination network.
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