CCNP Enterprise 300-410 Dumps PDF

Explanation

The problem is “SSH traffic does not match in the ACL” and “CoPP policy is applied for receiving SSH

traffic from the WAN interface” so we should apply CoPP on the control plane interface instead.

In OSPF (Open Shortest Path First), the MTU (Maximum Transmission Unit) size must match on both sides of a link for OSPF neighbors to form an adjacency12. If the MTU sizes do not match, the OSPF adjacency will not form, and the routers will not become neighbors12.

In this case, R1 cannot establish a neighbor relationship with R2. One possible reason for this could be a mismatch in the MTU size on the interfaces of R1 and R212.

To resolve this issue, you can configure the mtu ignore command on the interfaces of R1 and R2 (Option A). This command allows OSPF to ignore the MTU size when determining if it can form an adjacency with a neighbor12. This means that even if the MTU sizes do not match, OSPF will still form an adjacency, and R1 and R2 will become neighbors12.

References:

• OSPF MTU Mismatch - NetworkLessons.com
• Understanding OSPF MTU Mismatch Conditions and Solutions - Cisco

In this topology, the Hub router will receive advertisements from R2 Spoke router on its tunnel

interface. The problem here is that it also has a connection with R3 Spoke on that same tunnel

interface. If we don’t disable split-horizon, then the Hub will not relay routes from R2 to R3 and the

other way around. That is because it received those routes on the same interface tunnel and therefore

it cannot advertise back out that same interface (split-horizon rule). Therefore we must disable splithorizon

on the Hub router to make sure the Spokes know about each other.