How many ICTs must be configured to provide full server redundancy if no gatekeeper is present in the network?

You have two clusters with six Cisco Unified CallManager systems in each. How many ICTs must be configured to provide full server redundancy if no gatekeeper is present in the network?

A.
1

B.
5

C.
2

D.
3

E.
6

F.
4

Explanation:

The rule is: Configure one ICT (intercluster trunk) for each destination cluster (must be done both ways). Thus, in cluster A you define a ICT to cluster B, then in cluster B, you define a ICT to cluster A. For each ICT, you can define up to 3 remote CallManager servers for the destination cluster.
However, the question states there are 6 CallManager systems, thus, if the three CallManagers defined in the 1st ICT were not available, then a second ICT would be defined to reach the other 3 available CallManagers. So, you have two ICT in cluster A going to cluster B and two ICT in cluster B going to cluster A, giving you a total of 4 ICTs.