- A
Deploy the application in a DMZ behind a stateful firewall with least-privilege rules.
A DMZ enclave with a stateful firewall ensures strict network isolation and policy enforcement, which is the best practice for high-value applications.
- B
Install an intrusion detection system (IDS) on the application subnet.
Why wrong: IDS provides monitoring but does not prevent direct network access to the application; it is not an isolation technique.
- C
Configure a jump box with two-factor authentication to access the application.
Why wrong: A jump box controls administrative access but does not isolate the application from network-based attacks.
- D
Place the application on a separate VLAN with an ACL.
Why wrong: VLANs provide logical separation but can be compromised via VLAN hopping or misconfiguration; they do not offer the same security as a DMZ enclave.
Quick Answer
The answer is to deploy the application in a DMZ behind a stateful firewall with least-privilege rules. This is the best approach for secure enclave isolation because a DMZ creates a physical or logical buffer zone that separates the high-value application from the internal network, while a stateful firewall with least-privilege rules ensures only explicitly permitted traffic can enter or leave the enclave, minimizing the attack surface. On the CompTIA SecurityX CAS-004 exam, this question tests your understanding of network segmentation and defense-in-depth; a common trap is choosing VLANs alone, which lack the same enforcement and can be misconfigured or bypassed, or selecting an IDS/IPS, which detects threats but does not isolate. Remember the memory tip: "DMZ with rules isolates, VLANs just segregate."
CAS-004 Security Engineering Practice Question
This CAS-004 practice question tests your understanding of security engineering. 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.
A security architect is designing a secure enclave for a high-value application. Which of the following is the BEST approach to isolate the application from the rest of the network?
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
Deploy the application in a DMZ behind a stateful firewall with least-privilege rules.
Option B is correct because an enclave uses a DMZ with strict firewall rules to isolate the application. Option A is wrong because VLANs alone do not provide the same level of isolation; they can be misconfigured or bypassed. Option C is wrong because jump boxes are for administrative access, not isolation. Option D is wrong because IDS/IPS is detection, not isolation.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Deploy the application in a DMZ behind a stateful firewall with least-privilege rules.
Why this is correct
A DMZ enclave with a stateful firewall ensures strict network isolation and policy enforcement, which is the best practice for high-value applications.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
- ✗
Install an intrusion detection system (IDS) on the application subnet.
Why it's wrong here
IDS provides monitoring but does not prevent direct network access to the application; it is not an isolation technique.
- ✗
Configure a jump box with two-factor authentication to access the application.
Why it's wrong here
A jump box controls administrative access but does not isolate the application from network-based attacks.
- ✗
Place the application on a separate VLAN with an ACL.
Why it's wrong here
VLANs provide logical separation but can be compromised via VLAN hopping or misconfiguration; they do not offer the same security as a DMZ enclave.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CAS-004 questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this CAS-004 question test?
Security Engineering — This question tests Security Engineering — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Deploy the application in a DMZ behind a stateful firewall with least-privilege rules. — Option B is correct because an enclave uses a DMZ with strict firewall rules to isolate the application. Option A is wrong because VLANs alone do not provide the same level of isolation; they can be misconfigured or bypassed. Option C is wrong because jump boxes are for administrative access, not isolation. Option D is wrong because IDS/IPS is detection, not isolation.
What should I do if I get this CAS-004 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CAS-004 questions on access control and AAA configuration.
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?
Authentication checks who the user is.
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Last reviewed: Jun 24, 2026
This CAS-004 practice question is part of Courseiva's free CompTIA 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 CAS-004 exam.
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