Choose all the correct options

Question

in your network, you have noticed route oscillation involving an ospf route. what is the reason?

Accepted Answer

There is a duplicate router ID in the network.

Answer

There is a mismatching netmask.

Answer

The external preference of OSPF is 201.

Answer

There is an NSSA area.

In your network, you have noticed route oscillation involving an OSPF route. What is the reason?