Quick Answer
The answer is authorization. While authentication verifies the engineer’s identity during login, it is the authorization function that determines whether that authenticated user is permitted to execute specific commands, such as entering configuration mode. In the AAA model, authorization enforces policies by checking what actions a user is allowed to perform after they have been authenticated. On the CCNA 200-301 v2 exam, this distinction is frequently tested in scenarios where a user can log in but cannot access privileged EXEC or global configuration modes—a common trap is confusing this with authentication failure. Remember that authentication answers “who you are,” while authorization answers “what you are allowed to do.” A useful memory tip is to think of authorization as the “permission slip” that grants or denies access to commands and resources.
This 200-301 practice question tests your understanding of network services and security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: authentication verifies the identity of a user attempting to access a Cisco network device before granting any access.. 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 network engineer successfully logs in to a router, but cannot enter configuration mode because the command is rejected by policy. Which AAA function is controlling this behavior?
Authentication
Why wrong: Authentication already succeeded, so it is not the step now preventing the command.
Authorization
Correct. Authorization controls what actions the user may perform.
Accounting
Why wrong: Accounting records activity but does not directly grant or deny the command.
Encryption
Why wrong: Encryption protects data in transit but is not the AAA control involved here.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Authorization
Authentication confirms identity. Authorization determines which commands, privilege levels, or resources that authenticated user is permitted to access.
Key principle: Authentication verifies the identity of a user attempting to access a Cisco network device before granting any access.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Authentication
Why it's wrong here
Authentication already succeeded, so it is not the step now preventing the command.
When this WOULD be correct
In a different question, if it asked about the process that prevents a user from logging in altogether due to incorrect credentials, then authentication would be the correct answer. For example, if a user attempts to log in with a wrong username or password, authentication would fail.
Authorization
Why this is correct
Correct. Authorization controls what actions the user may perform.
Related concept
Authentication verifies the identity of a user attempting to access a Cisco network device before granting any access.
Accounting
Why it's wrong here
Accounting records activity but does not directly grant or deny the command.
When this WOULD be correct
If the question were about monitoring user activities and resource usage on the router, such as tracking which commands were executed by users, then accounting would be the correct answer. For example, a question could ask about the function that logs user actions after they have been authenticated and authorized.
Encryption
Why it's wrong here
Encryption protects data in transit but is not the AAA control involved here.
When this WOULD be correct
If the question were about securing the communication between the router and a management station, asking which AAA function ensures that the data is encrypted during transmission, then encryption would be the correct answer.
Option-by-option analysis
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.
Why this is correct
Correct. Authorization controls what actions the user may perform.
Why this is wrong here
Authentication verifies the identity of the user (e.g., via username/password). Since the user successfully logged in, authentication has already passed; it does not control subsequent command-level permissions.
★ When this WOULD be the correct answer
In a different question, if it asked about the process that prevents a user from logging in altogether due to incorrect credentials, then authentication would be the correct answer. For example, if a user attempts to log in with a wrong username or password, authentication would fail.
Why candidates choose this
Students often confuse authentication with authorization because both are AAA components and the terms sound similar. They may think that if a command is rejected, it must be an authentication issue.
Why this is wrong here
Accounting tracks and logs user activities (e.g., commands executed, session duration) for auditing or billing purposes. It does not directly grant or deny access to configuration mode.
★ When this WOULD be the correct answer
If the question were about monitoring user activities and resource usage on the router, such as tracking which commands were executed by users, then accounting would be the correct answer. For example, a question could ask about the function that logs user actions after they have been authenticated and authorized.
Why candidates choose this
Test-takers might think accounting includes monitoring and controlling access because it logs events, but its function is purely record-keeping, not enforcement.
Why this is wrong here
Encryption is a security mechanism that protects data confidentiality (e.g., SSH, IPsec) but is not part of the AAA framework. AAA stands for Authentication, Authorization, and Accounting only.
★ When this WOULD be the correct answer
If the question were about securing the communication between the router and a management station, asking which AAA function ensures that the data is encrypted during transmission, then encryption would be the correct answer.
Why candidates choose this
Encryption is often associated with secure access (e.g., SSH for login), so a student might incorrectly assume it also controls command permissions.
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
A common exam trap is confusing authentication with authorization. Candidates often think that if a user cannot enter configuration mode, it means the login failed, which is incorrect. Authentication only confirms the user's identity during login. Once authenticated, authorization controls what commands or modes the user can access. Misunderstanding this distinction leads to incorrect answers. The question states the user successfully logged in, so the failure to enter configuration mode is due to authorization restrictions, not authentication failure.
Trap categories for this question
Command / output trap
Authentication already succeeded, so it is not the step now preventing the command.
Detailed technical explanation
AAA stands for Authentication, Authorization, and Accounting, which are critical components in network security management. Authentication verifies the identity of a user attempting to access network devices, such as routers or switches. Authorization then determines what level of access or which commands the authenticated user is permitted to execute. Accounting logs the user's activities for auditing and compliance purposes. In Cisco devices, AAA is implemented to enforce security policies and control user privileges effectively. In the scenario where a network engineer can log in but cannot enter configuration mode, the authentication step has already succeeded, confirming the user's identity. However, the command to enter configuration mode is rejected because the authorization function restricts the user's permissions based on predefined policies. Authorization uses role-based access control or privilege levels to allow or deny specific commands or configuration changes, ensuring users operate within their assigned rights. A common exam trap is confusing authentication with authorization. Authentication only verifies who the user is, but does not control what the user can do after logging in. Candidates might incorrectly assume that failing to enter configuration mode is an authentication failure, but it is actually an authorization restriction. Practically, Cisco IOS uses AAA authorization methods to enforce command-level permissions, preventing unauthorized configuration changes even after successful login.
Key takeaway
Authentication verifies the identity of a user attempting to access a Cisco network device before granting any access.
Real-world example
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Review authentication verifies the identity of a user attempting to access a Cisco network device before granting any access., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Services and Security — This question tests Network Services and Security — Authentication verifies the identity of a user attempting to access a Cisco network device before granting any access..
The correct answer is: Authorization — Authentication confirms identity. Authorization determines which commands, privilege levels, or resources that authenticated user is permitted to access.
Review authentication verifies the identity of a user attempting to access a Cisco network device before granting any access., then practise related 200-301 questions on the same topic to reinforce the concept.
Authentication verifies the identity of a user attempting to access a Cisco network device before granting any access.
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Last reviewed: May 17, 2026
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