CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: authentication on Cisco devices verifies the identity of users or devices attempting to access network resources.. 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.
Which two statements about AAA on Cisco devices are correct? Choose two.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Authentication verifies identity
AAA breaks access control into authentication, authorization, and accounting. TACACS+ is commonly preferred for device administration because it separates all three functions and encrypts the full payload.
Key principle: Authentication on Cisco devices verifies the identity of users or devices attempting to access network resources.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Authentication verifies identity
Why this is correct
Authentication answers who the user is.
Related concept
Authentication on Cisco devices verifies the identity of users or devices attempting to access network resources.
✓
Authorization determines what an authenticated user is allowed to do
Why this is correct
Authorization controls permitted actions or command access.
Related concept
Authentication on Cisco devices verifies the identity of users or devices attempting to access network resources.
✗
Accounting replaces the need for local usernames entirely
Why it's wrong here
Accounting records activity; it does not replace authentication sources by itself.
When this WOULD be correct
In a question that specifically asks about a system where local usernames are deemed unnecessary due to a centralized identity management solution, such as a fully integrated Active Directory environment, this option could be correct.
In a scenario where a question specifically states that AAA is limited to RADIUS only, option D would be correct. For example, if the question asked which protocols AAA can use in a specific configuration that only supports RADIUS, then this option would apply.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Authentication verifies identityCorrect answer▾
Why this is correct
Authentication answers who the user is.
✗Accounting replaces the need for local usernames entirelyWrong answer — click to see why▾
Why this is wrong here
This option is incorrect because accounting does not replace local usernames; instead, it complements AAA by tracking user activity and resource usage while still allowing for local authentication methods.
★ When this WOULD be the correct answer
In a question that specifically asks about a system where local usernames are deemed unnecessary due to a centralized identity management solution, such as a fully integrated Active Directory environment, this option could be correct.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of the roles of AAA components, mistakenly thinking that accounting can fully manage user identities without local credentials.
✗AAA can only be used with RADIUS and not TACACS+Wrong answer — click to see why▾
Why this is wrong here
This option is wrong because AAA can be implemented with both RADIUS and TACACS+, allowing for flexible authentication methods on Cisco devices. Both protocols serve different purposes and can coexist in a network environment.
★ When this WOULD be the correct answer
In a scenario where a question specifically states that AAA is limited to RADIUS only, option D would be correct. For example, if the question asked which protocols AAA can use in a specific configuration that only supports RADIUS, then this option would apply.
Why candidates choose this
Candidates might choose this option due to a misunderstanding of AAA protocols, believing that RADIUS is the only option due to its popularity in many implementations, leading to confusion about the capabilities of TACACS+.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common exam trap is assuming that accounting replaces the need for local usernames or authentication sources. Accounting only logs user activities and does not authenticate or authorize users. Another frequent mistake is believing AAA supports only RADIUS and not TACACS+. Cisco AAA supports both protocols, with TACACS+ often preferred for device administration due to its full payload encryption and separation of AAA functions. Misunderstanding these roles can lead to incorrect answer choices and confusion during the exam.
Detailed technical explanation
How to think about this question
AAA (Authentication, Authorization, and Accounting) is a security framework used on Cisco devices to control user access and track user activities. Authentication verifies the identity of a user or device attempting to access the network, ensuring only legitimate users gain entry. Authorization then determines what resources or commands an authenticated user is permitted to access, enforcing granular control over network operations. Accounting records user activities and resource usage for auditing and compliance purposes.
In Cisco implementations, AAA can integrate with external servers such as RADIUS or TACACS+ to centralize and enhance security management. Authentication confirms who the user is, typically by validating credentials against a database. Authorization follows by enforcing policies that specify which commands or network resources the user can access. Accounting logs these interactions for later review. This separation of duties improves security and operational control, especially in complex network environments.
A common exam trap is confusing the roles of AAA components, such as assuming accounting replaces the need for local usernames or that AAA only supports RADIUS. In reality, accounting only logs activities and does not replace authentication methods. Additionally, AAA supports both RADIUS and TACACS+, with TACACS+ preferred for device administration because it encrypts the entire payload and separates authentication, authorization, and accounting functions. Understanding these distinctions is critical for Cisco CCNA exam success and practical network security management.
KKey Concepts to Remember
Authentication on Cisco devices verifies the identity of users or devices attempting to access network resources.
Authorization determines the specific commands or network resources an authenticated user is allowed to access or execute.
Accounting records user activities and resource usage to provide audit trails and support compliance requirements.
AAA on Cisco devices can integrate with external servers like RADIUS and TACACS+ to centralize authentication and authorization.
TACACS+ protocol encrypts the entire payload and separates authentication, authorization, and accounting functions for enhanced security.
Accounting does not replace authentication or authorization but complements them by logging user actions.
AAA improves network security by breaking access control into distinct, manageable functions that enforce identity and permissions.
Cisco devices use AAA to enforce granular access control policies and track user activities for network administration.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Authentication on Cisco devices verifies the identity of users or devices attempting to access network resources.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review authentication on Cisco devices verifies the identity of users or devices attempting to access network resources., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Services and Security — This question tests Network Services and Security — Authentication on Cisco devices verifies the identity of users or devices attempting to access network resources..
What is the correct answer to this question?
The correct answer is: Authentication verifies identity — AAA breaks access control into authentication, authorization, and accounting. TACACS+ is commonly preferred for device administration because it separates all three functions and encrypts the full payload.
What should I do if I get this 200-301 question wrong?
Review authentication on Cisco devices verifies the identity of users or devices attempting to access network resources., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Authentication on Cisco devices verifies the identity of users or devices attempting to access network resources.
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