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

Question

Options

• AIt ensures that data will be forwarded by RouterB.
• BIt provides stability for the OSPF process on RouterB.
• CIt specifies that the router ID for RouterB should be 10.0.0.1.
• DIt decreases the metric for routes that are advertised from RouterB.
• EIt indicates that RouterB should be elected the DR for the LAN.

• A
  14% (5)
• B
  71% (25)
• D
  9% (3)
• E
  6% (2)

Explanation

A loopback interface is a virtual, software-only interface that is always up as long as the router is operational. (B) It provides stability to the OSPF process because OSPF selects the router ID based on the highest loopback IP address. Since loopbacks never go down (unlike physical interfaces), the router ID remains constant, preventing unnecessary OSPF reconvergence. (C) If RouterB's loopback is configured with 10.0.0.1, OSPF will use that as the Router ID for RouterB, since loopback addresses take precedence over physical interface addresses in router ID selection. Option A is wrong - a loopback doesn't guarantee forwarding of data. Option D is wrong - loopbacks don't affect route metrics. Option E is wrong - DR election is based on OSPF priority and router ID, and loopbacks don't participate in DR elections directly.

No community discussion yet for this question.