This VCP-DCV practice question tests your understanding of vsphere security. 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.
An administrator wants to configure the ESXi host firewall to allow connections only from a specific management subnet. How can this be achieved?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the ESXi firewall settings to define allowed IP addresses for the required services.
Option B is correct because the ESXi firewall can be configured with rule sets that allow traffic only from specific IP addresses or subnets. Option A is incorrect because disabling all firewall rules would be too permissive. Option C is incorrect because the DCUI is for direct console access, not firewall rules. Option D is incorrect because vSphere HA is not related to firewall configuration.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 vSphere HA and set it to control management traffic.
DCUI is for local console lockdown, not network firewall.
✗
Set the firewall to enabled and allow all incoming connections.
Why it's wrong here
This would open the host to all management traffic.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related VCP-DCV subnetting questions on CIDR, address ranges, and subnet selection.
vSphere Security — This question tests vSphere Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use the ESXi firewall settings to define allowed IP addresses for the required services. — Option B is correct because the ESXi firewall can be configured with rule sets that allow traffic only from specific IP addresses or subnets. Option A is incorrect because disabling all firewall rules would be too permissive. Option C is incorrect because the DCUI is for direct console access, not firewall rules. Option D is incorrect because vSphere HA is not related to firewall configuration.
What should I do if I get this VCP-DCV question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related VCP-DCV subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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