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NETW204 Ch 08
The Routing Table: A Closer Look
| Question | Answer |
|---|---|
| Level 1 Route | A route with a subnet mask equal to or less than the classful mask of the network address. |
| Level 1 Parent Route | A 1st-level route in the routing table that has subnets "catalogued" under it. A 1st level parent route does not contain a next-hop IP address or exit interface information, but serves as a type of header information for the child routes. |
| Level 2 Route | A subnet is the level 2 route of the parent route. |
| Level 2 Child Route | The subnets that belong to the parent route. |
| Which characteristic can be used to determine whether a route is an ultimate route? | The route includes an exit interface. |
| Router R1 is configured with R1(config)#ip classless and R1(config)#ip route 0.0.0.0 0.0.0.0 s0/0/0/ What will R1 do with a packet that matches a parent route but does not match any associated child routes? | Forward the packet via the default route. |
| What action will enable classful routing behavior on a router? | Issuing the no ip classless command. |
| In the route lookup process, what constitutes the preferred route? | The longest match of the leftmost bits. |
| If a packet matches a level 1 parent route in the routing table, what occurs next in the lookup process? | The router looks for the level 2 child route with an exit interface. |
| What do the ip classless and no ip classless commands do? | Determine the address lookup behavior of the routing process. |
| Router R1 is configured with R1(config)#no ip classless and R1(config)#ip route 0.0.0.0 0.0.0.0 s0/0/0/ What will R1 do with a packet that matches a parent route but does not match any associated child routes? | Drop the packet. |
| What makes a level 1 or a level 2 route an ultimate route? | When the route also contains a next-hop IP address or an exit interface. |
| When is the subnet mask displayed with the child route and not the parent route? | When using VLSM, a subnet mask displayed with the child route and not the parent route. |
| Does the network administrator configure the parent route? | No, it is created when the subnet (level 2 child) route is added to the routing table. |
| Can there be a parent route without any child routes? | No. Parent routes do not contain a next-hop address or exit interface. This information is contained in the child routes. |
| Before any level 2 child routes are examined for a match, what must match? | There must be a match with the level 1 parent route. |
| What determines how many bits must match between the destination IP address of a packet and a route in the routing table? | The subnet mask for that entry in the routing table determines how many bits must match between the destination IP address of a packet and a route in the routing table. |
| What is the current default routing behavior on Cisco routers, and what command can be used to modify this? | The default behavior is classless. The no ip classless command can be used to modify the routing behavior. |
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AZ4ME
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