200-301 Question 305
Single answerA network administrator is troubleshooting a routing issue in their network. They notice that two routes to the same destination network, 10.10.10.0/24, are being advertised by two different routing protocols: OSPF and RIP. The OSPF route has an administrative distance of 110, while the RIP route has an administrative distance of 120. Which route will be installed in the routing table, and why?
- A
The OSPF route will be installed because it has a lower administrative distance.
- B
The RIP route will be installed because it has a higher administrative distance.
- C
Both routes will be installed because they are learned from different protocols.
- D
Neither route will be installed because they have different administrative distances.
Show answer and explanation
Correct answer: A
Explanation
Administrative distance (AD) is used to determine the trustworthiness of different routing sources. Lower AD values are preferred, and only the route with the lowest AD is installed in the routing table. In this scenario, the OSPF route has a lower AD (110) compared to RIP (120), so the OSPF route is selected.
- A. Correct.
Correct: The OSPF route will be installed because administrative distance is a measure of trustworthiness, and lower values are preferred. OSPF has an administrative distance of 110, which is lower than RIP’s 120.
- B. Incorrect.
Incorrect: RIP is less preferred because it has a higher administrative distance (120) compared to OSPF (110). Routes with higher administrative distances are considered less trustworthy.
- C. Incorrect.
Incorrect: Only the most preferred route (the one with the lowest administrative distance) will be installed in the routing table. Both cannot be installed simultaneously for the same destination.
- D. Incorrect.
Incorrect: Routes with different administrative distances are compared, and the one with the lowest administrative distance is installed. It is not true that neither route will be installed.