The answer is to use a VPN with application-level access control, time-limited accounts, and just-in-time (JIT) privileges. These three controls enforce the principle of least privilege by ensuring contractors can only reach specific internal applications, only when needed, and only for a defined duration. On the CompTIA SecurityX CAS-004 exam, this scenario tests your ability to distinguish between network-level and application-level access, a common trap where full VPN access is mistakenly selected—remember that full VPN grants excessive lateral movement, which violates zero-trust segmentation. The exam often pairs this with shared or permanent accounts as distractors, so focus on accountability and temporary scope. A useful memory tip is "JIT and App-VPN, not full net"—just-in-time access plus application-specific VPN keeps contractors locked to only what they need, when they need it.
CAS-004 Security Architecture Practice Question
This CAS-004 practice question tests your understanding of security architecture. 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.
A security architect is designing a secure remote access solution for contractors who need temporary access to a few internal applications. Which THREE of the following are best practices for controlling contractor access? (Select THREE.)
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.
Time-limited accounts enforce temporary access, application-level VPNs restrict access to specific applications, and just-in-time (JIT) privileges reduce standing access. Full VPN access provides too much network access, shared accounts lack accountability, and permanent accounts are against least privilege.
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.
✗
Allow contractors to use a shared account for simplicity
Why it's wrong here
Shared accounts eliminate accountability and make auditing difficult.
JIT provides access only when needed, reducing the risk of unused standing privileges.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✓
Create time-limited accounts that expire automatically
Why this is correct
Time-limited accounts ensure access is revoked after the contract period.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
Provide full network-level VPN access
Why it's wrong here
Full VPN access gives contractors unnecessary network visibility and violates least privilege.
✓
Use a VPN with application-level access control
Why this is correct
Application-level VPN restricts access to only the required applications.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
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.
Security Architecture — This question tests Security Architecture — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Implement just-in-time (JIT) temporary privilege elevation — Time-limited accounts enforce temporary access, application-level VPNs restrict access to specific applications, and just-in-time (JIT) privileges reduce standing access. Full VPN access provides too much network access, shared accounts lack accountability, and permanent accounts are against least privilege.
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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