Which of the following is an OSPF configuration parameter that is used on an ABR, but not
on an internal router?
A.
A virtual link to area 0.
B.
OSPF summarization command.
C.
default-cost extension to the area command.
D.
no-summary extension to the area stub command.
E.
None of the other alternatives apply
For me, same as question 56… But I might be mistaken. Do you have a link to Cisco doc which supports your answer?
I would answer: B
A, B and C are correct.
https://supportforums.cisco.com/document/116011/ospf-inter-area-route-summarization
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13703-8.html