ABC Company has four locations total, all connected via an IP WAN. Each location has a Cisco Unified Communications Manager cluster, and the headquarters cluster is connected to all other clusters via intercluster trunks. ABC wants to allow up to eight simultaneous calls across the IP

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Cisco 642-447 Exam
WAN. To call between sites, an employee dials a 2-digit access code plus a 4-digit extension. If more than eight calls are made, or if the IP WAN is not available, calls should be sent to ABC Company’s preferred long-distance carrier. If the trunk to the long-distance carrier is not available, the local provider should be used. The long-distance carrier requires 10 digits to complete a long- distance call. The local provider requires 11 digits to complete a long-distance call but only 7 digits for local calls.

What is the minimum number of route lists required at the headquarters location?

A.
1

B.
2

C.
3

D.
4

E.
5

Explanation: