Exam 200-120 Question id=78 IP Routing Technologies

Which statements about the OSPF Router ID are true?

A. It identifies the source of a Type 1 LSA.
B. It should be the same on all routers in an OSPF routing instance.
C. By default, the lowest IP address on the router becomes the OSPF Router ID.
D. The router automatically chooses the IP address of a loopback as the OSPF Router ID.
E. It is created using the MAC Address of the loopback interface.
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This router-id can be statically assigned, or it can be dynamically assigned based on an interface IP addresses.

To statically assign the router-id:
Router(config-router)#router-id 172.16.1.1

Automatically assign the router-id:
- The highest IP Address of a manually created loopback interface.
- If there is no configured Loopback interface then the router-id will be the highest IP Address of the active physical interface.



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