You have a Frame Relay topology that is currently a hub and spoke using a single physical serial interface on the hub router with the default network type. OSPF is also running on the interface.

You execute the following command:

ip ospf network point-to-point

What would be the effect of executing this command on the serial interface of the hub router?

A. The hello interval for OSPF will change to 30 seconds

B. The dead interval for OSPF will change to 40 seconds

C. There will now be a DR election
D. The hub router must now be configured with a router ID

Explanation:
The dead interval for OSPF will change to 40 seconds. By default, a Frame Relay connection that uses a physical interface is designated a non-broadcast network for purposes of determining the OSPF hello and dead intervals. There are four possible network types for Frame Relay, and they use different values for the OSPF hello and dead intervals. The values are shown below:

When the ip ospf network point-to-point command is executed, it will change the network type from the default of non-broadcast to point-to-point. This alteration will change the hello and dead intervals to 10 and 40 seconds, respectively.

The hello interval for OSPF will not change to 30 seconds. That is the value for non-broadcast and point-to-multipoint networks.

There will not be a designated router (DR) election. DRs are not elected on a point-to-point network.

The hub router does not need to be configured with a router ID. In OSPF for IPv4, the router can create its own by using one of the IP addresses of its interfaces.

Objective:
Layer 2 Technologies
Sub-Objective:
Explain Frame Relay

References:
Home > Support > Technology support > Initial Configurations for OSPF over Frame Relay Subinterfaces