100-150 Question 179
Single answerA network technician is configuring routing between two networks: 192.168.1.0/24 and 192.168.2.0/24. Both networks are connected to a single router. The technician has configured the following static route on the router: 'ip route 192.168.2.0 255.255.255.0 192.168.1.1'. However, devices on the 192.168.1.0/24 network cannot reach devices on the 192.168.2.0/24 network. What is the most likely reason for this issue?
- A
The static route is pointing to the wrong next-hop IP address.
- B
The subnet mask 255.255.255.0 is incorrect for the 192.168.2.0/24 network.
- C
A dynamic routing protocol needs to be configured instead of a static route.
- D
There is no route back from 192.168.2.0/24 to 192.168.1.0/24.
Show answer and explanation
Correct answer: D
Explanation
In routing, devices on one network can communicate with another network only if there are valid routes in both directions. In this case, the static route allows traffic from 192.168.1.0/24 to reach 192.168.2.0/24, but there is no route configured for traffic to return from 192.168.2.0/24 to 192.168.1.0/24. To resolve the issue, a route back to 192.168.1.0/24 must be added, either as a static route or through a dynamic routing protocol.
- A. Incorrect.
This is incorrect because the next-hop IP address is valid only if it belongs to the same subnet as the router's interface on the 192.168.1.0/24 network.
- B. Incorrect.
This is incorrect because the subnet mask 255.255.255.0 accurately represents a /24 network.
- C. Incorrect.
This is incorrect because a dynamic routing protocol is not required in this scenario. Static routing is sufficient as long as it is correctly configured.
- D. Correct.
This is correct because routing requires bidirectional communication. Without a route from 192.168.2.0/24 back to 192.168.1.0/24, the return traffic cannot reach the source network.