200-301 Question 323
Single answerA network administrator configures a static host route for a server with the IP address 192.168.1.10/32 via the next-hop IP address 192.168.1.1. After the configuration, the administrator notices that the host route is not being used, and traffic to 192.168.1.10 is instead routed through a default route. What could be the most likely reason for this behavior?
- A
The host route has a higher administrative distance than the default route.
- B
The subnet mask for the host route is incorrectly configured as /24 instead of /32.
- C
The next-hop IP address 192.168.1.1 is not reachable.
- D
The host route is not supported on the current router model.
Show answer and explanation
Correct answer: C
Explanation
Host routes (/32 routes) are the most specific routes, and they should take precedence over less specific routes like the default route when properly configured. However, if the next-hop IP address for the host route is unreachable, the route cannot be added to the routing table, and the router will fall back to using the default route or other available routes. This makes option 3 the correct answer.
- A. Incorrect.
Host routes generally take precedence over default routes if the administrative distance is the same; a higher administrative distance would not cause this behavior.
- B. Incorrect.
A /24 subnet mask would not qualify as a host route, but this would not cause the default route to take precedence since the /24 route is still more specific than the default route.
- C. Correct.
If the next-hop IP address is not reachable, the host route cannot be installed in the routing table, causing the router to fall back to the default route.
- D. Incorrect.
Host routes are supported on all modern routers and are not dependent on the router model.