The answer is to enable CPU pinning and memory reservation for the VM. This combination is correct because CPU pinning binds the VM’s virtual CPUs to specific physical cores, guaranteeing dedicated processing resources and eliminating CPU contention from other VMs, while memory reservation ensures that a fixed amount of physical memory is always available, preventing latency-inducing swapping or ballooning. On the ENCOR 350-401 exam, this scenario tests your understanding of virtualization performance features under the “Virtualization” domain, often appearing in a drag-and-drop or multiple-choice question where a trap option suggests using only CPU affinity or memory limits instead of reservations. A key memory tip is to think of “pin and reserve” as locking down both compute and memory—like assigning a private lane and a guaranteed fuel tank for a race car—ensuring deterministic, low-latency performance for critical workloads.
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 data center architect is designing a virtualized environment for a latency-sensitive application. The application requires dedicated CPU cores and memory to avoid performance degradation. Which hypervisor feature should be configured to meet this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable CPU pinning and memory reservation for the VM.
Option A is correct because CPU pinning binds a VM's virtual CPUs to specific physical cores, ensuring dedicated processing resources and preventing CPU contention from other VMs. Memory reservation guarantees that the specified amount of physical memory is always available to the VM, eliminating the risk of memory swapping or ballooning that would introduce latency. Together, these features provide the deterministic performance required for latency-sensitive applications in a virtualized environment.
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.
✓
Enable CPU pinning and memory reservation for the VM.
Why this is correct
This guarantees dedicated resources and avoids contention with other VMs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a shared storage solution to reduce I/O latency.
Why it's wrong here
Shared storage addresses I/O, not CPU or memory contention.
✗
Configure the VM with a large vNUMA node to spread memory access.
Why it's wrong here
This can increase latency if memory is not local to the CPU.
✗
Enable memory overcommitment to maximize utilization.
Why it's wrong here
Overcommitment can cause memory contention and increase latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between resource allocation features that guarantee performance (CPU pinning and memory reservation) versus features that optimize utilization or storage I/O, leading candidates to mistakenly select shared storage or memory overcommitment when the question explicitly demands dedicated resources.
Detailed technical explanation
How to think about this question
CPU pinning (also called CPU affinity) is typically configured via hypervisor-specific tools like `virsh vcpupin` on KVM or the vSphere client for ESXi, and it ensures that the VM's vCPUs run only on designated physical cores, avoiding context-switching overhead and cache pollution from other workloads. Memory reservation is enforced by the hypervisor's memory management layer, which pre-allocates physical pages and prevents the VM from being subjected to memory compression, swapping, or transparent page sharing (TPS) that could cause latency spikes. In real-world scenarios, applications like high-frequency trading or real-time analytics often require both CPU pinning and memory reservation to achieve sub-millisecond response times, and failure to configure these can lead to unpredictable performance degradation during resource contention.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: Enable CPU pinning and memory reservation for the VM. — Option A is correct because CPU pinning binds a VM's virtual CPUs to specific physical cores, ensuring dedicated processing resources and preventing CPU contention from other VMs. Memory reservation guarantees that the specified amount of physical memory is always available to the VM, eliminating the risk of memory swapping or ballooning that would introduce latency. Together, these features provide the deterministic performance required for latency-sensitive applications in a virtualized environment.
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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