Hi again this is your host Aviva Korea. And in this case, we are going to introduce how to allow a plus b network that is not subnets. So when it comes to class B networks, the first two pieces set to one, zero, and there are about 14 bits that will identify the network. The initial bytes are from 128 to 191. Class B networks are very famous. They have been used by small to large organizations and networks.

So, let's go ahead and apply and see how the prefix list will be will act we will consult to r1 and bring it know what to do show IP route to see the routing table. But just to be clear, remove the previous prefix lists that we applied. And so we have a clear picture of the routing table as you can see, so we have the full routes here for all the networks that are converged into the routing table. So called T. IP prefix list statement. Give it a name statement D permit We will say 128 because the network started on 28 dot zero dot zero dot zero slash two and the first two bits that are identified for class B, greater or equal to 16. Less than or equal to 1616 means the number of posts the number of posts, it starts from number from bit number 16.

Let's apply that to the routing process to the router process which is router EA GRP 10. Distribute list permit prefix statement B FA zero slash one. We know that class A networks the networks are advertised through FA zero slash one interface. Let's exit and we can see that the routing table is now sinking. And, and it has resync to with all the other routing tables we do show IP route And you can see we have only a log Class B networks that have not been submitted and all other networks are removed. So, we have achieved our purpose here, I think.

Thank you very much and see you in the next lecture.