CCNA 2 v6.0 (Routing & Switching Essentials v6) Chapter 2: Static Routing: Check Your Understanding Questions Answers
1. What are two advantages of static routing over dynamic routing? (Choose two.)
- Static routing is more secure because it does not advertise over the network.
- Static routing is relatively easy to configure for large networks.
- Static routing requires little knowledge of the network for correct implementation.
- Static routing scales well with expanding networks.
- Static routing uses fewer router resources than dynamic routing.
Explanation: Static routing requires a thorough understanding of the entire network for proper implementation. It can be prone to errors and does not scale well for large networks. Static routing uses fewer router resources because no computing is required for updating routes. Static routing can also be more secure because it does not advertise over the network.
2. What type of route allows a router to forward packets even though its routing table contains no specific route to the destination network?
- Default route
- Destination route
- Dynamic route
- Generic route
Explanation: A static default route is a catch-all route for all unmatched networks.
3. Why would a floating static route be configured with an AD that is higher than the AD of a dynamic routing protocol that is running on the same router?
- To act as a gateway of last resort
- To be the priority route in the routing table
- To be used as a backup route
- To load-balance the traffic
Explanation: By default, dynamic routing protocols have a higher AD than static routes. Configuring a static route with a higher AD than that of the dynamic routing protocol will result in the dynamic route being used instead of the static route. However, should the dynamically learned route fail, then the static route will be used as a backup.
4. What is the correct syntax of a floating static route?
- ip route 0.0.0.0 0.0.0.0 serial 0/0/0
- ip route 172.16.0.0 255.248.0.0 10.0.0.1
- ip route 209.165.200.228 255.255.255.248 serial 0/0/0
- ip route 209.165.200.228 255.255.255.248 10.0.0.1 120
Explanation: Floating static routes are used as backup routes, often to routes learned from dynamic routing protocols. To be a floating static route, the configured route must have a higher AD than the primary route. For example, if the primary route is learned through OSPF, then a floating static route that serves as a backup to the OSPF route must have an AD greater than 110. In this example, the AD of 120 is put at the end of the static route: ip route 209.165.200.228 255.255.255.248 10.0.0.1 120.
5. Which type of static route that is configured on a router uses only the exit interface?
- Default static route
- Directly connected static route
- Fully specified static route
- Recursive static route
Explanation: When only the exit interface is used, the route is a directly connected static route. When the next-hop IP address is used, the route is a recursive static route. When both are used, it is a fully specified static route.
6. The network administrator configures the router with the ip route 172.16.1.0 255.255.255.0 172.16.2.2 command. How will this route appear in the routing table?
- C 172.16.1.0 [1/0] via 172.16.2.2
- C 172.16.1.0 is directly connected, Serial0/0
- S 172.16.1.0 [1/0] via 172.16.2.2
- S 172.16.1.0 is directly connected, Serial0/0
Explanation: The route will appear in the routing with a code of S (Static).
7. What two pieces of information are needed in a fully specified static route to eliminate recursive lookups? (Choose two.)
- The AD for the destination network
- The interface ID exit interface
- The interface ID of the next-hop neighbor
- The IP address of the exit interface
- The IP address of the next-hop neighbor
Explanation: A fully specified static route can be used to avoid recursive routing table lookups by the router. A fully specified static route contains both the IP address of the next-hop router and the ID of the exit interface.
8. Assume the administrator has entered the ip route 192.168.10.0 255.255.255.0 10.10.10.2 5 command. How would an administrator test this configuration?
- Delete the default gateway route on the router.
- Manually shut down the router interface used as a primary route.
- Ping any valid address on the 192.168.10.0/24 network.
- Ping from the 192.168.10.0 network to the 10.10.10.2 address.
Explanation: A floating static is a backup route that only appears in the routing table when the interface used with the primary route is down. To test a floating static route, the route must be in the routing table. Therefore, shutting down the interface used as a primary route would allow the floating static route to appear in the routing table.
9. Which three IOS troubleshooting commands can help to isolate problems with a static route? (Choose three.)
- ping
- show arp
- show ip interface brief
- show ip route
- show version
- tracert
Explanation: The ping, show ip route, and show ip interface brief commands provide information to help troubleshoot static routes. The show version command does not provide routing information. The tracert command is used at the Windows command prompt and is not an IOS command. The show arp command displays learned IP address to MAC address mappings contained in the ARP table.
10. What happens to a static route entry in a routing table when the outgoing interface associated with that route goes into the down state?
- The router automatically redirects the static route to use another interface.
- The router polls neighbors for a replacement route.
- The static route is removed from the routing table.
- The static route remains in the table because it was defined as static.
Explanation: When the interface associated with a static route goes down, the router will remove the route because it is no longer valid.