The correct answer is to use esxcli network firewall ruleset set to create an allowed IP list for the HTTP ruleset. This works because the ESXi firewall operates on a default-deny model, but each ruleset can be configured with an allowed IP list that explicitly permits traffic only from specified source addresses, overriding the default deny for that ruleset without opening the port to all traffic. On the VMware Certified Professional Data Center Virtualization VCP-DCV exam, this scenario tests your understanding of granular firewall control versus broad security policies—a common trap is assuming you must disable the firewall or open all ports, which violates security best practices. Remember that the esxcli command targets the specific ruleset, not the entire firewall, allowing precise access for management workstations. A helpful memory tip: think of “ruleset set” as setting the guest list for a specific door—only invited IPs get through, while the rest stay locked out.
VCP-DCV vSphere Security Practice Question
This VCP-DCV practice question tests your understanding of vsphere security. 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.
An administrator needs to allow HTTP traffic from a specific management workstation to an ESXi host while blocking all other inbound traffic. The ESXi firewall uses the default ruleset. What should the administrator do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use esxcli network firewall ruleset set to create an allowed IP list for the HTTP ruleset
Option D is correct because the ESXi firewall allows creating allow rules for specific IP addresses via esxcli, which overrides the default deny. Option A is wrong because opening all ports is insecure. Option B is wrong because service console firewall is not used in modern ESXi. Option C is wrong because disabling firewall is insecure.
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.
✗
Open all firewall ports for the management subnet
Why it's wrong here
Overly permissive and insecure.
✗
Disable the ESXi firewall and use a network firewall
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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 esxcli network firewall ruleset set to create an allowed IP list for the HTTP ruleset — Option D is correct because the ESXi firewall allows creating allow rules for specific IP addresses via esxcli, which overrides the default deny. Option A is wrong because opening all ports is insecure. Option B is wrong because service console firewall is not used in modern ESXi. Option C is wrong because disabling firewall is insecure.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An administrator wants to configure the ESXi host firewall to allow connections only from a specific management subnet. How can this be achieved?
easy
A.Enable vSphere HA and set it to control management traffic.
✓ B.Use the ESXi firewall settings to define allowed IP addresses for the required services.
C.Configure the DCUI to restrict management access.
D.Set the firewall to enabled and allow all incoming connections.
Why B: 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.
Last reviewed: Jun 24, 2026
Question Discussion
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This VCP-DCV practice question is part of Courseiva's free VMware certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the VCP-DCV exam.
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