- A
Subnetting
Subnetting divides IP address space.
- B
DMZs
DMZs are segmented zones for public services.
- C
Firewalls
Why wrong: Firewalls control traffic but are not a segmentation method.
- D
VLANs
VLANs logically separate networks on a switch.
- E
Intrusion Detection Systems
Why wrong: IDS monitors traffic but does not segment.
Question 610 of 1,000
ISC2 CC Network Security Practice Question
This CC practice question tests your understanding of network 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 organization wants to implement network segmentation to improve security. Which three methods are commonly used for network segmentation? (Select THREE.)
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
✓
Subnetting
VLANs, subnets, and DMZs are common segmentation methods. Firewalls enforce rules but are not segmentation methods themselves; IDS is a monitoring tool.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Subnetting
Why this is correct
Subnetting divides IP address space.
Related concept
Access ports place end devices into a single VLAN.
- ✓
DMZs
Why this is correct
DMZs are segmented zones for public services.
Related concept
Access ports place end devices into a single VLAN.
- ✗
Firewalls
Why it's wrong here
Firewalls control traffic but are not a segmentation method.
- ✓
VLANs
Why this is correct
VLANs logically separate networks on a switch.
Related concept
Access ports place end devices into a single VLAN.
- ✗
Intrusion Detection Systems
Why it's wrong here
IDS monitors traffic but does not segment.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related CC questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this CC question test?
Network Security — This question tests Network Security — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Subnetting — VLANs, subnets, and DMZs are common segmentation methods. Firewalls enforce rules but are not segmentation methods themselves; IDS is a monitoring tool.
What should I do if I get this CC question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related CC questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Last reviewed: Jul 4, 2026
This CC practice question is part of Courseiva's free ISC2 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 CC exam.
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