- A
Enter global configuration mode, create the ACL with deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then permit ip any any, then enter the interface facing the source and apply the ACL inbound.
This is correct because the standard procedure is to first enter global configuration mode, then create the ACL with the deny statement for Telnet traffic followed by a permit any statement (since ACLs have an implicit deny at the end), then apply the ACL inbound on the interface facing the source. Applying before creating the ACL would fail.
- B
Enter the interface facing the source, apply the ACL inbound, then enter global configuration mode and create the ACL with deny and permit statements.
Why wrong: This is incorrect because you cannot apply an ACL to an interface before it is created. The ACL must exist in the configuration before it can be applied.
- C
Enter global configuration mode, create the ACL with permit ip any any first, then deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then enter the interface facing the source and apply the ACL inbound.
Why wrong: This is incorrect because the order of statements in an ACL matters. The permit ip any any would allow all traffic, making the subsequent deny statement ineffective. The deny must come before the permit.
- D
Enter global configuration mode, create the ACL with deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then enter the interface facing the source and apply the ACL inbound, without adding a permit statement.
Why wrong: This is incorrect because an ACL ends with an implicit deny all. Without a permit ip any any statement, all other traffic from the source network would be denied, which is not the requirement.
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.
Drag and drop the following steps into the correct order to plan, configure, and apply an extended ACL that blocks Telnet traffic from the 192.168.1.0/24 network to the 10.0.0.0/24 network, applied inbound on the interface facing the source.
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 the ACL with deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then permit ip any any, then enter the interface facing the source and apply the ACL inbound.
First, global config, then create ACL with deny and permit statements (order matters: deny first), then enter the source-facing interface and apply inbound; applying before creating ACL would fail.
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 the ACL with deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then permit ip any any, then enter the interface facing the source and apply the ACL inbound.
Why this is correct
This is correct because the standard procedure is to first enter global configuration mode, then create the ACL with the deny statement for Telnet traffic followed by a permit any statement (since ACLs have an implicit deny at the end), then apply the ACL inbound on the interface facing the source. Applying before creating the ACL would fail.
Related concept
Authentication checks who the user is.
- ✗
Enter the interface facing the source, apply the ACL inbound, then enter global configuration mode and create the ACL with deny and permit statements.
Why it's wrong here
This is incorrect because you cannot apply an ACL to an interface before it is created. The ACL must exist in the configuration before it can be applied.
- ✗
Enter global configuration mode, create the ACL with permit ip any any first, then deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then enter the interface facing the source and apply the ACL inbound.
Why it's wrong here
This is incorrect because the order of statements in an ACL matters. The permit ip any any would allow all traffic, making the subsequent deny statement ineffective. The deny must come before the permit.
- ✗
Enter global configuration mode, create the ACL with deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then enter the interface facing the source and apply the ACL inbound, without adding a permit statement.
Why it's wrong here
This is incorrect because an ACL ends with an implicit deny all. Without a permit ip any any statement, all other traffic from the source network would be denied, which is not the requirement.
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 the ACL with deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then permit ip any any, then enter the interface facing the source and apply the ACL inbound.Correct answer▾
Why this is correct
This is correct because the standard procedure is to first enter global configuration mode, then create the ACL with the deny statement for Telnet traffic followed by a permit any statement (since ACLs have an implicit deny at the end), then apply the ACL inbound on the interface facing the source. Applying before creating the ACL would fail.
✗Enter the interface facing the source, apply the ACL inbound, then enter global configuration mode and create the ACL with deny and permit statements.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that applying an ACL before creating it will result in an error because the ACL does not exist.
Why candidates choose this
Candidates might think that applying the ACL first is acceptable because they may confuse the order of operations or think that the ACL can be created after application.
✗Enter global configuration mode, create the ACL with permit ip any any first, then deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then enter the interface facing the source and apply the ACL inbound.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that ACL statements are processed sequentially; a permit any any before a deny would permit the Telnet traffic, defeating the purpose.
Why candidates choose this
Candidates might think that the order does not matter or that they can place the permit first to ensure other traffic is allowed, not realizing that the deny would never be reached.
✗Enter global configuration mode, create the ACL with deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then enter the interface facing the source and apply the ACL inbound, without adding a permit statement.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is forgetting that ACLs have an implicit deny at the end, so only Telnet traffic is explicitly denied, but all other traffic would also be denied unless a permit statement is added.
Why candidates choose this
Candidates might think that only the Telnet traffic needs to be denied and that other traffic will be allowed by default, not realizing the implicit deny.
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 the ACL with deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, then permit ip any any, then enter the interface facing the source and apply the ACL inbound. — First, global config, then create ACL with deny and permit statements (order matters: deny first), then enter the source-facing interface and apply inbound; applying before creating ACL would fail.
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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