cisco 200-301 tutorial

cisco 200-301 tutorial.Router(config)# ip route destination_network_# [subnet_mask] exit_interface_name [administrative_distance] [permanentThe first parameter that must be specified is the destination network number. The subnet mask can be omitted, in which case the default subnet mask will be used depending on the type of target network number: 255.0.0.0 for class A; 255.255.0.0 for class B; and 255.255.255.0 for class C.After the subnet mask parameter, you can specify how to get to the destination network, which can be done in two ways: by specifying the IP address of the next-hop neighbor or the router interface from which you should exit when going to the destination network. If the link is a multi-access link (more than two devices connected, such as three), the former method should be used. The latter method can be used if the link is a point-to-point link; in this case, the name of the router interface must be specified, such as serialOoThe administrative distance of the static route can also be specified. This is optional; if not specified, one of two defaults will be used based on the configuration of the previous parameter: if the IP address of the next-hop neighbor is specified, the administrative distance defaults to 1; if the router interface that should be used when going to the destination network is specified, the router will assume that this is a directly connected route and will in turn set its administrative distance to O0Chapter 18 Basic Routing 455Note that multiple static routes to the same destination network can be created. For example, there may be a primary and an alternate route to the destination network; for the primary route, the default administrative distance may be used, while for the alternate route, a larger administrative distance such as 2. When the alternate route is configured, the router will use the primary route, but when the interface used for the primary route fails, the router will use the alternate route.The parameter permanent makes it so that even if the interface used by the static route fails, it will remain in the routing table. If this parameter is omitted, when the interface used by the static route fails, the router will remove it from the routing table and try to find an alternate path and add it to the routing table. If you do not want packets to go to the destination network via other paths (possibly for security reasons), you should use the parameter permanentoKeep in mind the syntax for creating a static IP route using the command ip route. You can specify the next-hop address or local interface to be used to travel to the remote network; if you omit the administrative distance, it will default to 0 or 1, depending on how the static route is configured O18.1.2 Configuring the Default RouteA default route is a special kind of static route. A static route specifies the path that the router should use when going to a specific destination network, while a default route specifies the path that the router should use when it does not know how to get to the destination network. Note that upon receiving a packet, if there is no path to the destination network in the routing table, the router will discard it. This differs from a switch, which floods traffic going to an unknown destination. Therefore, the default route can be thought of as the universal route: if no path to the destination network is specified, the router uses the default route.