Default Routing Cisco Router configuration packet tracer

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Default Routing Cisco Router configuration packet tracer.
efault route which is also known as the gateway of last resort, is used in forwarding packets whose destination address does not match any route in the routing table. In IPv4 the CIDR notation for a default route is 0.0.0.0/0 and ::/0 in IPv6. Now since the both the host/network portion and the prefix length is zero a default route is the shortest possible match. In previous lessons in which we discussed basics of IP Routing we know that a router when performing a route lookup will select a route with longest possible match based on CIDR specifications, however if packet does not match any route in the routing table it will match a default route, the shortest possible route, if it exists in the routing table. A default route is very useful in network where learning all the more specific routes is not desirable such as in case of stub networks. A default is immensely useful when a router is connected to the Internet as without a default route the router must have the routing entry for all networks on the Internet which are in numbers of several hundred thousand, however with single route configured as the default the router will only need to know the destinations internal to the administrative domain and will forward IP packets for any other address towards the Internet using the default route.