300-440 Question 100
Single answerA network engineer is configuring OSPF over a Frame Relay network. The network includes one central router and multiple branch routers connected through Frame Relay. The engineer wants to conserve bandwidth by reducing OSPF hello and LSA traffic while maintaining full connectivity. Which OSPF network type should be configured on the Frame Relay interfaces?
- A
Point-to-point
- B
Broadcast
- C
Nonbroadcast
- D
Point-to-multipoint
Show answer and explanation
Correct answer: D
Explanation
In a Frame Relay network with a central router and multiple branches, point-to-multipoint is the preferred OSPF network type. It minimizes OSPF traffic, does not require full mesh connectivity, and avoids manual neighbor configuration. This makes it bandwidth-efficient and easier to manage compared to other OSPF network types.
- A. Incorrect.
Point-to-point is ideal for a direct connection between two routers but does not suit a network with multiple branch routers connected to a central router.
- B. Incorrect.
Broadcast assumes a fully meshed network where all routers can communicate directly, which is not the case in a typical Frame Relay network.
- C. Incorrect.
Nonbroadcast can work in Frame Relay networks, but it requires manual neighbor configuration, increasing administrative overhead compared to other options.
- D. Correct.
Point-to-multipoint is the best choice for this scenario as it conserves bandwidth by treating the network as a collection of point-to-point links without requiring full mesh connectivity or manual neighbor configuration.