The answer is SAML-based federation, which is the most secure and scalable approach for implementing single sign-on across multiple cloud applications. SAML, or Security Assertion Markup Language, enables identity federation by allowing an identity provider to securely pass authentication assertions to service providers, decoupling user credentials from each application and supporting cross-domain SSO. On the CISSP exam, this concept tests your understanding of identity and access management (IAM) in domain 5, often appearing in scenario-based questions where you must distinguish authentication protocols from authorization frameworks. A common trap is confusing SAML with OAuth, but remember that OAuth is for delegated authorization, not authentication, while LDAP lacks native web SSO capabilities and password reuse is fundamentally insecure. Memory tip: SAML stands for “Security Assertion Markup Language” — think of it as a secure “assertion” that travels between domains to prove identity without sharing passwords.
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.
An organization wants to implement single sign-on (SSO) for multiple cloud applications. Which of the following is the most secure and scalable approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement SAML-based federation
Option D is correct because SAML-based federation is specifically designed for SSO and identity federation across domains, providing both security and scalability. Option A is incorrect because OAuth is primarily an authorization framework, not an authentication protocol. Option B is incorrect as LDAP is a directory service protocol and does not natively support SSO across web applications. Option C is incorrect because reusing the same password across applications is insecure and not scalable.
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.
✓
Implement SAML-based federation
Why this is correct
SAML is the standard for federated identity and SSO, offering secure token exchange and scalable integration.
Related concept
Authentication checks who the user is.
✗
Use OAuth for authentication
Why it's wrong here
OAuth is primarily for authorization, not authentication; it does not provide a reliable SSO solution.
✗
Use the same password for all applications
Why it's wrong here
Shared passwords create a single point of failure and violate security best practices.
✗
Implement LDAP directory
Why it's wrong here
LDAP is for directory services, not SSO; it requires additional layers for federated identity.
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: Implement SAML-based federation — Option D is correct because SAML-based federation is specifically designed for SSO and identity federation across domains, providing both security and scalability. Option A is incorrect because OAuth is primarily an authorization framework, not an authentication protocol. Option B is incorrect as LDAP is a directory service protocol and does not natively support SSO across web applications. Option C is incorrect because reusing the same password across applications is insecure and not scalable.
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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