If OSPF is used in a multi-area OSPF network, which of the following statements regarding route summarization is true?
A.
Manual route summarization can only be done on autonomous system border routers.
B.
Manual route summarization must be done on all the backbone routers to be effective. Manual route summarization is optional on the routers in non-backbone areas.
C.
Manual route summarization is done on the ABRs. By default, automatic summarization is done; however, it may not be optimal for all networks.
D.
Manual route summarization is done on the ABRs. By default, no route summarization is done and all routes are advertised to all areas.
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide — Route Summarization Section:
“Manual route summarization is configured on Area Border Routers (ABRs) to control the advertisements between areas. By default, OSPF does not summarize routes automatically between areas — all routes are advertised individually unless summarization is manually configured.”
Summarization is always optional.
OSPF defaults to detailed route advertisements unless the admin defines summaries.
Thus, correct answer isD.
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