- A
Use Raw Device Mapping in physical compatibility mode for virtual machines.
Why wrong: Physical compatibility mode is rarely recommended; virtual compatibility mode is preferred for snapshots and vMotion.
- B
Enable Storage I/O Control (SIOC) on datastores to manage I/O latency.
SIOC automatically manages storage queues to maintain latency thresholds.
- C
Configure multiple storage paths with round-robin load balancing policy.
Round-robin path policy provides load balancing and failover for storage I/O.
- D
Deploy vSphere Flash Read Cache to reduce read latency.
Why wrong: vSphere Flash Read Cache is deprecated and not recommended for new deployments.
- E
Use VMFS-3 for large datastores to reduce seek time.
Why wrong: VMFS-3 is outdated; VMFS-5/6 are current and support larger volumes and better performance.
VCP-DCV vSphere Performance and Scaling Practice Question
This VCP-DCV practice question tests your understanding of vsphere performance and scaling. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO storage performance best practices should be followed when scaling a vSphere environment using shared storage? (Choose two.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Enable Storage I/O Control (SIOC) on datastores to manage I/O latency.
Using multiple paths with round-robin load balancing improves throughput and redundancy. Storage I/O Control (SIOC) manages latency and prevents a single VM from monopolizing storage. VMFS-3 is outdated and should be avoided. RDM in physical compatibility mode is rarely recommended. vSphere Flash Read Cache is deprecated.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Raw Device Mapping in physical compatibility mode for virtual machines.
Why it's wrong here
Physical compatibility mode is rarely recommended; virtual compatibility mode is preferred for snapshots and vMotion.
- ✓
Enable Storage I/O Control (SIOC) on datastores to manage I/O latency.
Why this is correct
SIOC automatically manages storage queues to maintain latency thresholds.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Configure multiple storage paths with round-robin load balancing policy.
Why this is correct
Round-robin path policy provides load balancing and failover for storage I/O.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Deploy vSphere Flash Read Cache to reduce read latency.
Why it's wrong here
vSphere Flash Read Cache is deprecated and not recommended for new deployments.
- ✗
Use VMFS-3 for large datastores to reduce seek time.
Why it's wrong here
VMFS-3 is outdated; VMFS-5/6 are current and support larger volumes and better performance.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related VCP-DCV NAT questions on configuration and troubleshooting.
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vSphere Performance and Scaling — study guide chapter
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FAQ
Questions learners often ask
What does this VCP-DCV question test?
vSphere Performance and Scaling — This question tests vSphere Performance and Scaling — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable Storage I/O Control (SIOC) on datastores to manage I/O latency. — Using multiple paths with round-robin load balancing improves throughput and redundancy. Storage I/O Control (SIOC) manages latency and prevents a single VM from monopolizing storage. VMFS-3 is outdated and should be avoided. RDM in physical compatibility mode is rarely recommended. vSphere Flash Read Cache is deprecated.
What should I do if I get this VCP-DCV question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related VCP-DCV NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
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