Exhibit:
There is no direct physical connectivity between Certkiller 3 and Certkiller 5. The Transit AS 65102 is only running partial-meshed IBGP between Certkiller 3 and Certkiller 5 and is using OSPF as its IGP. Both Certkiller 3 and Certkiller 5 are using the next-hop-self options. The external BGP routes are not being redistributed into OSPF. BGP synchronization is disabled.
What happens to the packet from AS 65101 to AS 65103?
A.
Packets will be black-holed because it will be dropped by Certkiller 4.
B.
Packets will be black-holed because it will be dropped by Certkiller 5.
C.
Packets will be black-holed because it will be dropped by Certkiller 6.
D.
Packets can be transported via the Transit AS 65102 without any problems.
Explanation:
Even with synchronization off testing 6 does not know how to route the packet because OSPF does not know about the route that BGP knows about. Synchronization being off assumes that there is a full mesh of BGP routers.