Refer to the exhibit. A network engineer configures OSPF and reviews the router configuration Which interface or interfaces are able to establish OSPF adjacency?

Question

Exhibits

Options

• AGigabitEthemet0/1 and GigabitEthernet0/1.40
• Bonly GigabitEthernet0/1
• Conly GigabttEthernet0/0
• DGigabit Ethernet0/0 and GigabitEthemet0/1

• A
  3% (2)
• B
  15% (10)
• C
  74% (48)
• D
  8% (5)

Explanation

Explanation

Only GigabitEthernet0/0 can establish OSPF adjacency because it is the sole interface included in the OSPF network statement(s) and is in an active state - meaning it will send and receive OSPF Hello packets to form neighbor relationships. GigabitEthernet0/1 is configured as a passive interface, which suppresses Hello packets on that interface, preventing any adjacency from forming, so options B and D are incorrect. GigabitEthernet0/1.40 is a subinterface that, without its own matching network statement or active OSPF participation, cannot independently establish adjacency, eliminating option A. Option D fails because while Gi0/0 is valid, Gi0/1 is passive and cannot form adjacencies regardless of being in the OSPF process.

Memory Tip: Think of a passive interface as a "listen-only" mode - it can receive routing information but never sends Hellos, so no adjacency is ever formed. Whenever you see passive-interface in a config, immediately cross off that interface as an adjacency candidate.

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