ccna 200 301 syllabus of errors summary of to kill

ccna 200 301 syllabus of errors summary of to kill.A final route is a route entry that includes the IP address of the next-hop router or the outgoing interface of this router. All level 1 and level 2 routes (that is, child routes) except the parent route are final routes.6.5.2 Route Finding Process***When a router receives an IP message, it checks the destination IP address and looks up the routing table. How does the router decide which route is the best route? What effect does the subnet mask have in the route lookup process? If you don't find a good match in the routing table, should you use supernet routing or a default route? With these questions in mind, learn about the route lookup process.The route lookup process is as follows: the router looks for level 1 routes: network routes (including parent routes), supernet routes, and default routes, based on the destination IP address in the packet. If the best match (meaning the longest subnet mask match) is the final route for level 1 (the route entry includes the IP location of the next-hop routeraddress or the outgoing address of this router. level 1 and level 2 routes other than the parent route are final routes). this route is used to forward packets.If the best match is the parent route in level 1, continue with the next lookup. The router finds a match in the parent route in level 1 and continues to look for child routes of that parent route.If there is a match for a child route, this child route is used to forward the packet.If no match is found in the child route, the lookup continues to the next step.Determine whether the router is performing classful or classless routing behavior (routing behavior). The classful and classless routing behavior here is different from the classful and classless routing protocols. The classful and classless routing protocols affect the creation of the routing table, whereas the classful and classless routing behavior determines how to search the routing table after it has been created. Classful and classless routing behavior is changed by the ipclassless and noipclassless commands. Jump to if classful routing behavior (no ip classless) and to if classless routing behavior (ip classless).Classful routing behavior: terminate the lookup and discard the packet. Classless routing behavior: Continue the lookup for level 1 supernet routes and default routes, and forward the packets using the supernet routes or default routes.