Which two statements about the OSPF Router ID are true? (Choose two.)

Which two statements about the OSPF Router ID are true? (Choose two.)

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.

Answer: A, D

Explanation:

From the output of the “show ip ospf database”:

r120#show ip ospf data

OSPF Router with ID (10.0.0.120) (Process ID 1)

Next, who are the other routers in our area?

Router Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum Link count

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