Which tool allows guest operating systems to share noncritical memory pages with the host?
A. CPU affinity
B. Memory ballooning
C. Swap file configuration
D. Network attached storage
Answer: B
The balloondriver communicates to the hypervisor to reclaim memory inside the guest when it is no longer valuable to the operating system. If the host begins to run low on memory, it will grow the balloon driver to reclaim memory from the guest. This reduces the chance that the physical host will begin to utilize virtualized memory from a defined paging file on its available disk resource, which causes performance degradation.
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