- A
Enter global configuration mode, create ACL with permit statement for HTTP from 192.168.1.0/24 to 10.0.0.1, add deny ip any any, enter interface configuration mode for GigabitEthernet0/1, apply ACL inbound.
This sequence correctly starts in global configuration mode, creates the ACL with the specific permit first, denies all other traffic, then enters the interface and applies the ACL inbound—matching the requirement exactly.
- B
Enter interface configuration mode, apply ACL inbound, then create ACL with permit statement, add deny ip any any, exit to global config.
Why wrong: This is incorrect because the ACL must be created before it can be applied to an interface. Applying a non-existent ACL will result in an error.
- C
Enter global configuration mode, create ACL with deny ip any any first, then permit statement for HTTP, enter interface, apply ACL inbound.
Why wrong: This is incorrect because the order of entries in an ACL matters: the permit statement must come before the deny all, otherwise the deny all will block all traffic including the desired HTTP traffic.
- D
Enter global configuration mode, create ACL with permit statement for HTTP, add deny ip any any, apply ACL outbound on interface GigabitEthernet0/1.
Why wrong: This is incorrect because the ACL should be applied inbound on the interface, not outbound. The question specifies inbound application.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which of the following sequences correctly orders the steps to plan, configure, and apply an extended ACL that permits HTTP traffic from the 192.168.1.0/24 subnet to the server at 10.0.0.1, and deny all other IP traffic, applied inbound on interface GigabitEthernet0/1?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enter global configuration mode, create ACL with permit statement for HTTP from 192.168.1.0/24 to 10.0.0.1, add deny ip any any, enter interface configuration mode for GigabitEthernet0/1, apply ACL inbound.
First enter global config, then create ACL with permit statement, then deny all, then enter interface, then apply ACL inbound.
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.
- ✓
Enter global configuration mode, create ACL with permit statement for HTTP from 192.168.1.0/24 to 10.0.0.1, add deny ip any any, enter interface configuration mode for GigabitEthernet0/1, apply ACL inbound.
Why this is correct
This sequence correctly starts in global configuration mode, creates the ACL with the specific permit first, denies all other traffic, then enters the interface and applies the ACL inbound—matching the requirement exactly.
Related concept
Authentication checks who the user is.
- ✗
Enter interface configuration mode, apply ACL inbound, then create ACL with permit statement, add deny ip any any, exit to global config.
Why it's wrong here
This is incorrect because the ACL must be created before it can be applied to an interface. Applying a non-existent ACL will result in an error.
- ✗
Enter global configuration mode, create ACL with deny ip any any first, then permit statement for HTTP, enter interface, apply ACL inbound.
- ✗
Enter global configuration mode, create ACL with permit statement for HTTP, add deny ip any any, apply ACL outbound on interface GigabitEthernet0/1.
Why it's wrong here
This is incorrect because the ACL should be applied inbound on the interface, not outbound. The question specifies inbound application.
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.
✓Enter global configuration mode, create ACL with permit statement for HTTP from 192.168.1.0/24 to 10.0.0.1, add deny ip any any, enter interface configuration mode for GigabitEthernet0/1, apply ACL inbound.Correct answer▾
Why this is correct
This sequence correctly starts in global configuration mode, creates the ACL with the specific permit first, denies all other traffic, then enters the interface and applies the ACL inbound—matching the requirement exactly.
✗Enter interface configuration mode, apply ACL inbound, then create ACL with permit statement, add deny ip any any, exit to global config.Wrong answer — click to see why▾
Why this is wrong here
An ACL must be created before it can be applied to an interface; applying it first is invalid.
Why candidates choose this
Candidates might think they can apply the ACL first and then define it, but Cisco IOS requires the ACL to exist before application.
✗Enter global configuration mode, create ACL with deny ip any any first, then permit statement for HTTP, enter interface, apply ACL inbound.Wrong answer — click to see why▾
Why this is wrong here
Placing the deny all before the permit would block all traffic, including the desired HTTP traffic, defeating the purpose of the ACL.
Why candidates choose this
Candidates might think they need to deny everything first and then permit specific traffic, but ACLs use a first-match approach.
✗Enter global configuration mode, create ACL with permit statement for HTTP, add deny ip any any, apply ACL outbound on interface GigabitEthernet0/1.Wrong answer — click to see why▾
Why this is wrong here
The ACL is applied outbound, but the requirement specifies inbound traffic, which would not filter the correct direction.
Why candidates choose this
Candidates may confuse inbound and outbound directions, especially if they think about traffic flow from the source perspective.
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: 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 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
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 200-301 questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Services and Security — This question tests Network Services and Security — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Enter global configuration mode, create ACL with permit statement for HTTP from 192.168.1.0/24 to 10.0.0.1, add deny ip any any, enter interface configuration mode for GigabitEthernet0/1, apply ACL inbound. — First enter global config, then create ACL with permit statement, then deny all, then enter interface, then apply ACL inbound.
What should I do if I get this 200-301 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 200-301 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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Last reviewed: Jun 6, 2026
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