350-501 · Question #133
Refer to the exhibit. What reestablishes the OSPF neighbor relationship between Router 1 and Router 2?
The correct answer is D. hello intervals match. To reestablish an OSPF neighbor relationship, critical parameters such as the hello and dead intervals must precisely match between the two routers.
Question
Refer to the exhibit. What reestablishes the OSPF neighbor relationship between Router 1 and Router 2?
Exhibit
Options
- Aauthentication is added to the configuration
- Bcorrect wildcard mask is used on Router 2
- COSPF process IDs match
- Dhello intervals match
How the community answered
(46 responses)- A4% (2)
- B2% (1)
- C2% (1)
- D91% (42)
Why each option
To reestablish an OSPF neighbor relationship, critical parameters such as the hello and dead intervals must precisely match between the two routers.
While OSPF authentication must match if configured, simply 'adding' it does not guarantee a fix if the issue lies with mismatched hello intervals.
Wildcard masks define interfaces for OSPF areas but typically don't directly cause a neighbor adjacency to drop if the interfaces themselves are correctly participating in OSPF.
OSPF process IDs are locally significant to each router and do not need to match between neighbors for an adjacency to form.
Concept tested: OSPF neighbor adjacency requirements
Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13689-18.html
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