200-301 Question 320
Single answerA network engineer has configured a static route on Router A to reach the 192.168.2.0/24 network via Router B's IP address 10.1.1.2. However, users on the 192.168.1.0/24 network connected to Router A cannot reach the 192.168.2.0/24 network. What could be the cause of the issue?
- A
The next-hop IP address 10.1.1.2 is not reachable from Router A.
- B
Router A does not have a route to the 192.168.1.0/24 network.
- C
Router B does not have a route back to the 192.168.1.0/24 network.
- D
The static route on Router A is incorrectly configured with a /16 subnet mask.
Show answer and explanation
Correct answer: C
Explanation
For successful communication between two networks, routing must be correctly configured on both ends. In this case, Router A can forward packets to Router B using the static route. However, if Router B does not have a route to send return traffic to the 192.168.1.0/24 network, the communication will fail. Ensuring bidirectional routing is critical when configuring static routes.
- A. Incorrect.
If the next-hop IP address (10.1.1.2) were not reachable, Router A would not be able to forward packets to Router B. However, the scenario assumes that the static route on Router A is correctly configured, and this is not the cause of the issue.
- B. Incorrect.
Router A is directly connected to the 192.168.1.0/24 network, so it does not need a specific route for it. This is not the issue.
- C. Correct.
If Router B does not have a route back to the 192.168.1.0/24 network, it cannot send return traffic, causing communication failure. This is the most likely cause of the issue.
- D. Incorrect.
While an incorrect subnet mask on the static route could cause issues, the scenario does not mention any subnet mask misconfiguration. The problem lies elsewhere.