The answer is to configure CPU affinity to pin the vCPUs to specific physical cores. This configuration explicitly binds a virtual machine’s virtual CPUs to designated physical cores, ensuring that no other virtual machine can use those cores, which directly satisfies the licensing requirement for dedicated CPU cores. Unlike CPU reservation, which only guarantees a minimum amount of compute resources but still allows co-scheduling with other workloads, CPU affinity provides exclusive access by preventing the hypervisor from scheduling other VMs on those pinned cores. On the ENCOR 350-401 exam, this topic tests your understanding of virtualization resource management and common licensing pitfalls, often appearing as a distractor where CPU reservation or NUMA alignment is incorrectly chosen. A key memory tip: think of “affinity” as “affixing” a VM to specific cores, while “reservation” only reserves time, not exclusivity.
CCNP Virtual Machines and Hypervisors Practice Question
This 350-401 practice question tests your understanding of virtual machines and hypervisors. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer is deploying a new virtualized application on a VMware vSphere cluster. The application requires dedicated CPU cores to meet licensing requirements, and the engineer must ensure that no other virtual machine can use those cores. The cluster uses VMware ESXi 7.0. Which configuration should the engineer apply to the virtual machine?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure CPU affinity to pin the VM to specific physical cores.
CPU affinity (option A) is the correct configuration because it explicitly binds a virtual machine's vCPUs to specific physical cores, ensuring that no other VM can use those cores. This meets the licensing requirement for dedicated CPU cores by preventing co-scheduling or sharing of those physical cores with other workloads, which CPU reservation alone does not guarantee.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Configure CPU affinity to pin the VM to specific physical cores.
Why this is correct
Correct because CPU affinity binds the VM to designated cores, ensuring exclusive use.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set a CPU reservation equal to the number of vCPUs.
Why it's wrong here
Incorrect because a reservation guarantees CPU time but does not prevent other VMs from using the same cores.
✗
Enable NUMA node affinity for the VM.
Why it's wrong here
Incorrect because NUMA affinity optimizes memory access, not CPU exclusivity.
✗
Configure a CPU limit equal to the number of vCPUs.
Why it's wrong here
Incorrect because a limit caps CPU usage but does not reserve cores exclusively.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse CPU reservation with dedicated core assignment, assuming that reserving CPU resources guarantees exclusive access to physical cores, when in fact reservation only guarantees resource availability, not exclusivity.
Detailed technical explanation
How to think about this question
CPU affinity in ESXi is configured via the vSphere Client or by editing the VMX file with the 'sched.cpu.affinity' parameter, which accepts a comma-separated list of physical CPU core IDs. This is a static pinning mechanism that overrides the ESXi scheduler's dynamic load balancing, which can lead to performance issues if the pinned cores become oversubscribed by other VMs or if the host's NUMA topology is not considered. In real-world scenarios, CPU affinity is often used for legacy licensing or real-time workloads, but it should be used sparingly because it can cause resource fragmentation and reduce overall cluster efficiency.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-401 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Virtual Machines and Hypervisors — This question tests Virtual Machines and Hypervisors — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure CPU affinity to pin the VM to specific physical cores. — CPU affinity (option A) is the correct configuration because it explicitly binds a virtual machine's vCPUs to specific physical cores, ensuring that no other VM can use those cores. This meets the licensing requirement for dedicated CPU cores by preventing co-scheduling or sharing of those physical cores with other workloads, which CPU reservation alone does not guarantee.
What should I do if I get this 350-401 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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