Selected Answer: C A. Clients in that cluster must have full mesh connectivity between eBGP peers: This option would mean that each eBGP router within an autonomous system should be directly connected to every other eBGP router in that system. This is not directly tied to the client-to-client reflection command in the configuration, which is about iBGP peering. B. No client-to-client reflection must be enabled: This would imply that the command in the configuration is wrong and that client-to-client reflection should be enabled. Client-to-client reflection is a method used inside an iBGP setup to let route reflectors send updates between their clients. C. Clients in that cluster must have full mesh connectivity between iBGP peers: This option is usually the requirement for iBGP networks without route reflectors. Each router within the iBGP network must be connected to every other router. However, using route reflectors or confederations can avoid the need for a full mesh.

D. No client-to-client must be disabled: This option seems to imply that the command in the configuration is correct, since it is disabling the client-to-client reflection. However, this is a double negative and could be confusing. If client-to-client reflection is not wanted or is causing problems, this command would be correct. Based on the command shown, it looks like client-to-client reflection has been deliberately disabled. If routers within the cluster are not receiving the desired prefixes, the most likely issue might be with the iBGP mesh inside the cluster. Therefore, the correct action would probably be: C. Clients in that cluster must have full mesh connectivity between iBGP peers. This is because when client-to-client reflection is disabled, each router in the iBGP cluster needs a full mesh topology unless another mechanism (like additional route reflectors) is present to ensure routing information is exchanged.

Selected Answer: D D has to be the right one. For example: does it really make sense to enable iBGP full mesh on a network with 5, 10 or N routers? The question only asks what should be done to solve the problem. It never says that no client-to-client configuration cannot be removed. The fastest way to fix this is to disable No client-to-client instead of enabling iBGP Full Mesh. Again, if we have 10 routers, it doesn't make sense to do something like that.