HPE Aruba Certified Network Security Expert (ACNSX) — Question 84

What would prevent two OSPF routers from forming an adjacency? (Choose two.)

Answer options

• A. Different priorities
• B. Different MTU sizes
• C. Different area types
• D. Different router IDs
• E. Different IP addresses

Correct answer: B, C

Explanation

Different MTU sizes (B) and different area types (C) can prevent OSPF routers from forming an adjacency because OSPF requires routers to have compatible MTU sizes for successful communication and to be in the same area type for adjacency. The other options, such as different priorities, router IDs, or IP addresses, do not prevent adjacency from being formed but may affect the election of designated routers or routing decisions.