Question 149 of 521

vSphere Security →mediumMultiple ChoiceObjective-mapped

VCP-DCV vSphere Security Practice Question

This VCP-DCV practice question tests your understanding of vsphere security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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?

A
Open all firewall ports for the management subnet
Why wrong: Opening all firewall ports for the management subnet is unnecessary and insecure; it would allow more than just HTTP traffic and from any IP in the subnet, not just the specific workstation.
B
Disable the ESXi firewall and use a network firewall
Why wrong: Disabling the ESXi firewall is insecure and not recommended; it would remove all filtering, and using a network firewall alone does not satisfy the requirement to allow only HTTP from a specific workstation at the ESXi level.
C
Modify the service console firewall rules
Why wrong: Modifying the service console firewall rules is not applicable because modern ESXi does not have a service console firewall; the ESXi firewall is managed via esxcli or the vSphere Client.
D
Use esxcli network firewall ruleset set to create an allowed IP list for the HTTP ruleset
Using esxcli network firewall ruleset set with an allowed IP list for the HTTP ruleset is correct because it restricts the HTTP ruleset to only the specified management workstation IP, blocking all other inbound traffic by default.

Full breakdown with real-world context →

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

✓

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 restricting a specific ruleset (such as HTTP) to a list of allowed IP addresses using the esxcli network firewall ruleset set command. Option A is wrong because opening all firewall ports for the management subnet is overly permissive and allows more than just HTTP traffic. Option B is wrong because disabling the ESXi firewall removes all host-level protection and is not recommended. Option C is wrong because the service console firewall is deprecated in modern ESXi; the correct method is to use the ESXi firewall with esxcli.

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
Opening all firewall ports for the management subnet is unnecessary and insecure; it would allow more than just HTTP traffic and from any IP in the subnet, not just the specific workstation.
✗
Disable the ESXi firewall and use a network firewall
Why it's wrong here
Disabling the ESXi firewall is insecure and not recommended; it would remove all filtering, and using a network firewall alone does not satisfy the requirement to allow only HTTP from a specific workstation at the ESXi level.
✗
Modify the service console firewall rules
Why it's wrong here
Modifying the service console firewall rules is not applicable because modern ESXi does not have a service console firewall; the ESXi firewall is managed via esxcli or the vSphere Client.
✓
Use esxcli network firewall ruleset set to create an allowed IP list for the HTTP ruleset
Why this is correct
Using esxcli network firewall ruleset set with an allowed IP list for the HTTP ruleset is correct because it restricts the HTTP ruleset to only the specified management workstation IP, blocking all other inbound traffic by default.
Related concept
CIDR notation defines the prefix length.

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.

Visual reference

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.

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FAQ

Questions learners often ask

What does this VCP-DCV question test?

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 restricting a specific ruleset (such as HTTP) to a list of allowed IP addresses using the esxcli network firewall ruleset set command. Option A is wrong because opening all firewall ports for the management subnet is overly permissive and allows more than just HTTP traffic. Option B is wrong because disabling the ESXi firewall removes all host-level protection and is not recommended. Option C is wrong because the service console firewall is deprecated in modern ESXi; the correct method is to use the ESXi firewall with esxcli.

What should I do if I get this VCP-DCV question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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