200-301 Question 303
Single answerA network engineer is troubleshooting a routing issue in a network running both OSPF and EIGRP. The router is receiving the same route (192.168.1.0/24) from both protocols. Which protocol's route will be installed in the routing table, and why?
- A
The route learned via OSPF, because it has a lower administrative distance of 90.
- B
The route learned via EIGRP, because it has a lower administrative distance of 90.
- C
The route learned via OSPF, because it has a higher administrative distance of 110.
- D
The route learned via EIGRP, because it has a higher administrative distance of 110.
Show answer and explanation
Correct answer: B
Explanation
Administrative distance (AD) is a measure used by routers to determine the trustworthiness of a routing source. Lower AD values are preferred over higher AD values. EIGRP has a default AD of 90, while OSPF has a default AD of 110. In this scenario, the route learned via EIGRP will be installed in the routing table because of its lower administrative distance.
- A. Incorrect.
Incorrect. While OSPF is a dynamic routing protocol, its administrative distance is 110, which is higher than EIGRP's default administrative distance of 90.
- B. Correct.
Correct. EIGRP has a default administrative distance of 90, which is lower than OSPF's default administrative distance of 110. Routes with a lower administrative distance are more trustworthy and preferred for installation in the routing table.
- C. Incorrect.
Incorrect. OSPF's administrative distance is 110, which is higher than EIGRP's administrative distance of 90. Routes with a higher administrative distance are less preferred.
- D. Incorrect.
Incorrect. EIGRP's administrative distance is 90, which is lower than 110, not higher. Hence, EIGRP's route will be chosen.