Cisco 200-105 Exam

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: Option A. D.

From the output of the “show ip ospf
database”: r120#show ip ospf data
OSPF Router with ID ( (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 600 0x8000023A 0x0092B3 1 1246 0x80000234 0x009CAC 1 148 0x8000022C 0x004399 3 152 0x80000240 0x0046CB 1
This tells us there are four routers in Area 1. The router with RID has 3 links in Area 1, everyone else has only 1 link. Also the router will choose the highest loopback interface as its OSPF router ID (if available).

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