CISSP Identity and Access Management Practice Question
This CISSP practice question tests your understanding of identity and access management. 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 analyst discovers that a service account in Active Directory has not had its password changed in 5 years and has domain admin privileges. The account is used by a legacy application that does not support modern authentication protocols. Which of the following is the MOST secure approach to manage this account?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Decommission the legacy application and migrate to a modern alternative that supports secure authentication
Option D is correct because the best security is to decommission the account and modernize the application. Option A is wrong because group Managed Service Accounts (gMSAs) require Windows Server 2012 or later and application support. Option B is wrong because a long, complex password still has risk of theft and is not automatically rotated. Option C is wrong because disabling the account would break the application.
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.
✗
Convert the account to a group Managed Service Account (gMSA)
Why it's wrong here
gMSA is not supported by legacy applications; also requires domain functional level.
✗
Set a very long, complex password and store it in a password manager
Why it's wrong here
Still a static password; manual rotation is not enforced.
✓
Decommission the legacy application and migrate to a modern alternative that supports secure authentication
Why this is correct
Eliminates the risk entirely by removing the service account.
Related concept
Authentication checks who the user is.
✗
Disable the account and create a new service account with limited privileges
Why it's wrong here
Disabling breaks the application; new account may also need domain admin.
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 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. Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CISSP questions on access control and AAA configuration.
Identity and Access Management — This question tests Identity and Access Management — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Decommission the legacy application and migrate to a modern alternative that supports secure authentication — Option D is correct because the best security is to decommission the account and modernize the application. Option A is wrong because group Managed Service Accounts (gMSAs) require Windows Server 2012 or later and application support. Option B is wrong because a long, complex password still has risk of theft and is not automatically rotated. Option C is wrong because disabling the account would break the application.
What should I do if I get this CISSP 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 CISSP questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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