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CV0-004 Practice Question: A cloud administrator is troubleshooting a…
A cloud administrator is troubleshooting a performance issue in a virtualized environment. Which TWO metrics should be monitored to identify CPU contention on the hypervisor?
⚠ Common exam trap
A common mix-up: candidates confuse CPU utilization per core (which shows how busy the CPU is) with CPU ready time (which shows how long VMs are waiting), but high utilization alone does not prove contention—only ready and co-stop times directly measure scheduling delays.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
CPU ready time
CPU ready time (B) measures the time a virtual machine is ready to execute but must wait for the hypervisor to schedule it on a physical core. High ready time directly indicates CPU contention, as the VM is being starved of CPU cycles. CPU co-stopping time (E) occurs when multiple vCPUs in a single VM must wait to be scheduled simultaneously, which also signals CPU overcommitment and contention on the hypervisor.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Swap rate
Why it's wrong here
Swap rate is a memory metric, not a CPU contention metric.
- ✓
CPU ready time
Why this is correct
CPU ready time is a direct indicator of CPU contention, as it measures the time a vCPU is waiting for physical CPU resources.
- ✗
Memory ballooning
Why it's wrong here
Memory ballooning is related to memory overcommitment, not CPU contention.
- ✗
CPU utilization per core
Why it's wrong here
CPU utilization shows usage but does not directly indicate contention; high utilization can occur without contention.
- ✓
CPU co-stopping time
Why this is correct
CPU co-stopping time measures the time correlated vCPUs are waiting for each other, indicating contention.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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