300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

By Cisco · Question Mode

QuestionQ418

Layer 3 Technologies

Refer to the exhibit. An engineer is attempting to create an OSPF summary route for network 10.0.0.0/8, but the summary route does not appear in the routing table.

Why is the summary route absent?

Question Image

  • A The summary-address command is used only for summarizing prefixes between areas.
  • B The summary route is visible only in the OSPF database, not in the routing table.
  • C There is no route for a subnet inside 10.0.0.0/8, so the summary route is not generated.
  • D The summary route is not visible on this router, but it is visible on other OSPF routers in the same area.
Explanation

The OSPF summary-address command aggregates routes from other routing protocols that are redistributed into OSPF. An aggregate is generated only when at least one redistributed component route falls within the configured summary range. With no route for a subnet of 10.0.0.0/8, no 10.0.0.0/8 summary route is generated.

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