An OSPF ABR router summarizes all internal area 1 routes into one OSPF interarea summary route. How does this type of route get inserted into the routing table?

An OSPF ABR router summarizes all internal area 1 routes into one OSPF interarea summary route. How does this type of route get inserted into the routing table?

• The router injects into the backbone a single type 5 LSA that describes the summary route.
• Cisco IOS automatically creates a summary route on the router to the Null0 interface in order to prevent routing loops.
• This route summarization was configured via the summary-address address mask router configuration mode command.
• An entry with a router designator OIA will be inserted into the routing table.

Explanation: A summary route to the Null0 interface is created automatically by the Cisco IOS to prevent routing loops when manual summarization is configured. Any packet that is sent to the Null0 interface is dropped. The ABR will summarize all the internal routes for one area before injecting them into another area.

Exam with this question: Quiz - Advanced OSPF CCNPv8 ENARSI