Your boss wants you to install vSphere 4 server on two HP C-class Blades. Each blade has two dual core CPU’s. How many vSphere processor licenses will be needed for this setup?

A.
4

B.
12

C.
2

D.
8

Explanation:
ESX and vCenter Server Installation Guide, ESX 4.0, vCenter Server 4.0, page 108. ‘License keys have a certain amount of capacity. Capacity is based on the number of processors in the host or the number of instances of the software asset. Dual-core and quad-core processors, such as Intel processors that combine two or four independent CPUs on a single chip, count as one processor.’
Therefore since there will be 4 CPUs in total, 4 licenses are required.