Cisco 100-105 Exam

Refer to the exhibit. Which two statements are true about the loopback address that is configured on RouterB? (Choose two.)

  • A. It ensures that data will be forwarded by RouterB.
  • B. It provides stability for the OSPF process on RouterB.
  • C. It specifies that the router ID for RouterB should be 10.0.0.1.
  • D. It decreases the metric for routes that are advertised from RouterB.
  • E. It indicates that RouterB should be elected the DR for the LAN.
Answer: Option B. C.
Explanation: 

A loopback interface never comes down even if the link is broken so it provides stability for the OSPF process (for example we use that loopback interface as the router-id) – The router-ID is chosen in the order below:
+ The highest IP address assigned to a loopback (logical) interface. + If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen. -> The loopback interface will be chosen as the router ID of RouterB –

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