The answer is that Authentication, Authorization, and Accounting (AAA) and least privilege are the correct security concepts for the given descriptions. Authentication verifies identity by checking credentials like a username and password, Authorization determines what actions an authenticated user is permitted to perform, and Accounting records user activity for auditing and billing purposes. Least privilege is a separate but complementary principle that grants only the minimum access required for a specific task, reducing the attack surface. On the CCNA 200-301 v2 exam, this topic tests your understanding of foundational access control models, often appearing in matching or multiple-choice questions where you must differentiate between the three AAA functions. A common trap is confusing Authorization with Authentication—remember that authentication asks “who you are,” while authorization asks “what you can do.” For a quick memory tip, think of the mnemonic “A-A-A” in order: first you Authenticate, then you Authorize, and finally you Account for what happened.
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 verifies the identity of a user or device before granting network access in Cisco AAA configurations.. 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.
AAA (Authentication, Authorization, and Accounting)
AAA provides a framework for controlling access to network resources by authenticating users, authorizing their actions, and accounting for their usage.
B
ACL (Access Control List)
Why wrong: ACLs filter traffic based on IP addresses, protocols, or ports, but they do not provide authentication, authorization, or accounting functions.
C
Port Security
Why wrong: Port security restricts MAC addresses on a switch port, but it does not authenticate users or provide accounting.
D
DHCP Snooping
Why wrong: DHCP snooping blocks rogue DHCP servers, but it does not provide authentication, authorization, or accounting.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AAA (Authentication, Authorization, and Accounting)
Authentication is the process of verifying that the user or device is who they claim to be, which matches 'Verifies identity'. Authorization determines what actions an authenticated entity is allowed to perform, matching 'Determines permitted actions'. Accounting tracks and records the activities of authenticated users, corresponding to 'Records activity'. Least privilege grants only the minimum access needed for a task, aligning with 'Grants only required access'. These are foundational security principles for access control.
Key principle: Authentication verifies the identity of a user or device before granting network access in Cisco AAA configurations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
AAA (Authentication, Authorization, and Accounting)
Why this is correct
AAA provides a framework for controlling access to network resources by authenticating users, authorizing their actions, and accounting for their usage.
Related concept
Authentication verifies the identity of a user or device before granting network access in Cisco AAA configurations.
✗
ACL (Access Control List)
Why it's wrong here
ACLs filter traffic based on IP addresses, protocols, or ports, but they do not provide authentication, authorization, or accounting functions.
✗
Port Security
Why it's wrong here
Port security restricts MAC addresses on a switch port, but it does not authenticate users or provide accounting.
✗
DHCP Snooping
Why it's wrong here
DHCP snooping blocks rogue DHCP servers, but it does not provide authentication, authorization, or accounting.
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.
✓AAA (Authentication, Authorization, and Accounting)Correct answer▾
Why this is correct
AAA provides a framework for controlling access to network resources by authenticating users, authorizing their actions, and accounting for their usage.
✗ACL (Access Control List)Wrong answer — click to see why▾
Why this is wrong here
ACLs are packet filtering mechanisms, not a security framework for user access control.
Why candidates choose this
Candidates may confuse ACLs with AAA because both involve 'access control' in their names.
✗Port SecurityWrong answer — click to see why▾
Why this is wrong here
Port security is a layer 2 feature for MAC address control, not a framework for user authentication and authorization.
Why candidates choose this
Candidates might think port security is part of AAA because it controls access to the network.
✗DHCP SnoopingWrong answer — click to see why▾
Why this is wrong here
DHCP snooping is a security feature for DHCP integrity, not a user access control framework.
Why candidates choose this
Candidates may associate DHCP snooping with security and assume it covers access control.
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
Do not confuse AAA with other security features that have 'access' or 'security' in their names. AAA is specifically about user authentication, authorization, and accounting, not about filtering traffic or preventing specific attacks.
Detailed technical explanation
How to think about this question
Authentication, Authorization, and Accounting (AAA) form a fundamental security framework in Cisco networking, especially relevant in the CCNA 200-301 Security Fundamentals domain. Authentication is the process that verifies the identity of a user or device attempting to access the network, ensuring that only legitimate entities gain entry. Authorization follows authentication by determining what resources or actions the authenticated user is permitted to access or perform. Accounting then tracks and logs the activities of the user, providing an audit trail for security and compliance purposes.
In Cisco devices, AAA services are configured to enforce these three security functions in sequence. When a user attempts to connect, the device first authenticates the user credentials, then authorizes access based on predefined policies or roles, and finally records session details such as commands executed or data transferred. This layered approach enhances network security by tightly controlling access and maintaining accountability. Understanding the distinct roles of each AAA component is critical for correctly implementing and troubleshooting Cisco security configurations.
A common exam trap is confusing the order and purpose of AAA components, such as mixing up authorization with authentication or assuming accounting controls access. In practical Cisco environments, misconfiguring AAA can lead to unauthorized access or lack of proper logging, which compromises security and auditing. Recognizing that authentication answers "who you are," authorization answers "what you can do," and accounting answers "what you did" helps avoid these mistakes and ensures correct AAA deployment in CCNA scenarios.
KKey Concepts to Remember
Authentication verifies the identity of a user or device before granting network access in Cisco AAA configurations.
Authorization determines the specific network resources and actions an authenticated user is permitted to access or perform.
Accounting records and logs user activities and resource usage for auditing and security compliance in Cisco devices.
AAA services in Cisco IOS enforce security by sequentially authenticating, authorizing, and accounting user sessions.
Authentication uses methods like passwords, tokens, or certificates to confirm user identity in Cisco network access control.
Authorization policies in Cisco devices restrict user privileges based on roles or profiles after successful authentication.
Accounting logs include session start and stop times, commands executed, and data transferred for forensic analysis.
Misunderstanding AAA roles can cause security gaps, such as granting access without proper authentication or failing to log user actions.
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 verifies the identity of a user or device before granting network access in Cisco AAA configurations.
Real-world example
How this comes up in practice
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.
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 verifies the identity of a user or device before granting network access in Cisco AAA configurations., 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 verifies the identity of a user or device before granting network access in Cisco AAA configurations..
What is the correct answer to this question?
The correct answer is: AAA (Authentication, Authorization, and Accounting) — Authentication is the process of verifying that the user or device is who they claim to be, which matches 'Verifies identity'. Authorization determines what actions an authenticated entity is allowed to perform, matching 'Determines permitted actions'. Accounting tracks and records the activities of authenticated users, corresponding to 'Records activity'. Least privilege grants only the minimum access needed for a task, aligning with 'Grants only required access'. These are foundational security principles for access control.
What should I do if I get this 200-301 question wrong?
Review authentication verifies the identity of a user or device before granting network access in Cisco AAA configurations., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Authentication verifies the identity of a user or device before granting network access in Cisco AAA configurations.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which security concept gives a user only the permissions required to perform assigned tasks and nothing more?
medium
A.Defense in depth
✓ B.Least privilege
C.Segmentation
D.Availability
Why B: Least privilege is the security principle that grants users only the specific permissions necessary to perform their job functions, minimizing potential damage from errors or malicious actions. Defense in depth is a layered security strategy using multiple controls, not a principle of limiting permissions. Segmentation divides a network into isolated segments to contain threats, but does not directly govern individual user permissions. Availability ensures systems and data are accessible when needed, which is unrelated to restricting access rights.
Last reviewed: Apr 13, 2026
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