A network engineer configures two connected routers to run OSPF in Area 0; however, the routers fail to establish adjacency. Which option is one of the caused for this issue?
A. Area numbers match.
B. OSPF process numbers do not match on both neighbor routers.
C. The Same MTU sizes are configured on both sides.
D. The Same OSPF router IDs are configured on both routers.
D is correct
It seems D is correct,after testing in GNS3 ,there was no adj because my routers had the same router id for the ospf processes.You can debug the adj with debug ip ospf adj command.
%OSPF-4-DUP_RTRID_NBR: OSPF detected duplicate router-id 1.1.1.1 from 10.0.0.1 on interface FastEthernet0/0
Answer is D
The same router ID configured on routers cause neighbor adjacency to fail.
I think they right answer is A,
if they have the same router ID, then they will use the highest loopback interface to tie the break, if not available, use the highest physical interface
Verify that neighboring routers have different Router IDs. Router IDs are used in order to identify each router in an OSPF network. Routers with the same Router ID will ignore HELLOs sent by each other, which prevents them from forming adjacency. The first line of show ip ospf command output displays the current Router ID of each router. Answer is D
https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13699-29.html
Routers with the same Router ID will ignore HELLOs sent by each other, which prevents them from forming adjacency.
I think the answer is D coz here they just said not established and configured in area 0 so he is sure he did that.
The router ID is used in OSPF for things other than adjacencies. They’re used for other things like virtual links, identifying other routers in the ospf database, etc., so yes you can set the router ID as an address that doesn’t even exist on your router and adjacencies will still come up.
The first thing that is going to be checked by the OSPF device is whether the remote device is in the same area. Answer A.
RED1, I desagree for you!!
The question is the routers FAIL to establish adjacency.
A: area ID MATCH is requeriment to establish adjacency.
B: OSPF proccess not be the same to adjancy unlike to EIGRP that need same AS.
C: The same MTU size is requirement too.
D: The same router ID do fail de adjancency, the question inform fail dont DOWN. This is the best answer
well, i dont speak english very well, but if you select answer A, you are saying that areas between router´s interfaces must be different in order to establish adjacencies,. for me in asnwer “D”
Question and Answer are both worded poorly. If “A” actually means to say “Areas do NOT match” then yes. But the answer is worded poorly so it muddies the intent.
Think “A” is correct.
Are you serious,`good aswer is A off course.
Response D incorrect because, in this condition, if they have the same router ID, the adjacency will flap but not DOWN every time.
this is incorrect.
Same outer ID causes routers to ignore hellos and therefore not forming an adjacency