ccna certification school

ccna certification school.. Default route-A route with an address of 0.0.0.0/0, or a route entry immediately followed by * after the route code.. Supernet route - refers to a network address with a mask length less than the classful mask length.. Network route - A route with a subnet mask length equal to the length of the classful mask. A network route can also be a parent route. Final route: refers to a route whose route entry contains the next-hop IP address or send-out interface. First-level parent route: a network route whose route entry does not contain the next-hop IP address or delivery interface for the network. A parent route is actually a header that indicates the presence of a second-level route, which is also referred to as a child route. Whenever a subnet is added to the routing table, the router automatically creates a first-level parent route in the routing table.Secondary route: refers to a subnet route with a classful network address. a secondary route is also called a subroute. the source of a secondary route can be a directly connected network, a static route, or a dynamic routing protocol. A second-level subroute is also a final route because the second-level route contains the next-hop IP address or send-out interface.The route finding process follows the longest match principle, i.e., the most exact match. Suppose the routing table has the following two static route entries: i- .S 172.16.1.0/24 is directly connected,Serial0/0/0 S 172.16.0.0/16 is directly connected,Serial0/0/l When a packet destined for the destination IP address 172.16.1.85 arrives at the router, the IP address is simultaneously numbered These two route entries match, but there are more bits matched with the 172.16.1.0/24 route entry, so the router will forward the packet using the static route that has 24 bits matched, the longest match.6.3.2 IPv4 Route Lookup Process After the routing table is populated, the next step is to perform a route lookup process on the received packets based on the longest match principle, as follows. The router examines the first-level routes (including network routes and supernet routes) to find the longest match with the destination address of the IP packet.The matching route. If the best-match route is a first-class final route, the route is used to forward packets. If the best match route is a first-level parent route, the router reviews the child routes of that parent route to find the best matchof the route. If a matching route exists in the secondary route, the packet is forwarded using that subroutes. If all the secondary subroutes do not match, it is determined whether the router is currently performing a classed routing behavior orIs classless routing behavior? Configure classless routing behavior with the global command ip classless, or configure classless routing behavior with the global command no ip