350-401 Question 344
Single answerA network engineer notices that a router is preferring routes from OSPF over EIGRP, even though EIGRP should have a lower administrative distance and be preferred. Upon investigation, the engineer sees that both routing protocols are configured on the router. What could be the cause of this issue?
- A
The administrative distance for EIGRP has been manually increased, making OSPF routes preferred.
- B
The OSPF process is misconfigured, resulting in higher priority routes.
- C
The EIGRP process is running in passive mode, causing it to advertise routes with lower priority.
- D
The router's default administrative distance values for OSPF and EIGRP have been swapped.
Show answer and explanation
Correct answer: A
Explanation
This scenario highlights a troubleshooting process where the administrative distance of routing protocols affects route selection. By default, EIGRP has a lower administrative distance (90) than OSPF (110), so EIGRP should be preferred. However, if the administrative distance for EIGRP is manually increased above 110, OSPF routes will be selected instead. Understanding and verifying the administrative distances of routing protocols is crucial in resolving such issues.
- A. Correct.
Correct. If the administrative distance for EIGRP is manually increased (e.g., above 110), OSPF routes (with a default administrative distance of 110) will be preferred. This is a common misconfiguration that can cause routing preference issues.
- B. Incorrect.
Incorrect. OSPF misconfigurations typically do not directly affect the administrative distance or routing preference unless administrative distance adjustments are explicitly made.
- C. Incorrect.
Incorrect. Passive mode in EIGRP affects adjacency and route advertisement, but it does not directly change the administrative distance of the protocol.
- D. Incorrect.
Incorrect. The default administrative distances for OSPF (110) and EIGRP (90) cannot be swapped unless explicitly modified, which would be a manual configuration and not a default behavior.