C is correct
OSPF Adjacency is established only when the MTU values of the two routers are matched.
The normal or default MTU size typically used is 1500 bytes.
passive-interface default sets passive in all the interfaces. However, no passive-interface gigabitethernet2/0 and no passive-interface gigabitethernet1/0 remove it from the connecting interfaces allowing it to create a neighboring relationship. Therefore, I go for C.
MTU mismatch doesn't lead to break of neighbor relationship, only can lead to abnormal work. But the passive-interface will lead the interface stop to send HELLO, than no neighbor set up.
A mismatched mtu prevent ospf from forming full adjacency, not 2 way neighbor relationship so C doesnt make full sense for me though it is the better option among the provided answers
MTU mismatch between neighboring interfaces. show interface <int-type><int-num>
https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13699-29.html?referring_site=bodynav#anc13
RFC 2328:
If the Interface MTU field in the Database Description packet indicates an IP datagram size that is larger than the router can accept on the receiving interface without fragmentation, the
Database Description packet is rejected.
C is absolutely right.
Yes, I've experienced this in the field on several occasions ..an odd issue but a definite sneak up and bang factor - your tunnel and consistent traffic be done.
https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/116119-technote-ospf-mtu-00.html#:~:text=In%20this%20example%2C%20the%20routers%20have%20GigabitEthernet%20interfaces%20with%20an%20MTU%20set%20to%202000.%20The%20MTU%20of%20the%20L2%20switch%20is%20only%201500%20bytes
https://www.reddit.com/r/networking/comments/k9hr35/ospf_mtu/
upvoted 3 times
...
...
This section is not available anymore. Please use the main Exam Page.200-301 Exam Questions
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
oooMooo
Highly Voted 3 years, 6 months ago[Removed]
3 years, 2 months agotyuipo
Highly Voted 3 years, 6 months ago[Removed]
Most Recent 7 months, 2 weeks agopicho707
11 months, 3 weeks agoJunsK1e
1 year agoNewJeans
1 year, 1 month agoYinxs
1 year, 2 months agoODZA
1 year, 3 months agoRaman1996
2 years, 9 months agovannplus11
3 years, 1 month agoChocobo
3 years, 8 months ago[Removed]
3 years, 2 months ago