- A
Enter global configuration mode, create ACL with deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, permit ip any any, then enter interface G0/0, apply ip access-group <acl-number> in
This option correctly orders the steps: create the ACL with the specific Telnet deny and permit all, then enter the interface and apply the ACL.
- B
Enter interface G0/0, apply ip access-group <acl-number> in, then create ACL with deny tcp any any eq telnet, permit ip any any
This is incorrect because the ACL must be created before it can be applied to an interface. Applying a non-existent ACL would result in an error.
- C
Enter global configuration mode, create ACL with permit ip any any, deny tcp any any eq telnet, then enter interface G0/0, apply ip access-group <acl-number> in
This is incorrect because the order of ACL entries matters. The permit ip any any would allow all traffic, including Telnet, before the deny statement is evaluated, making the deny ineffective.
- D
Enter global configuration mode, create ACL with deny tcp any any eq telnet, permit ip any any, then apply ip access-group <acl-number> in without entering interface
This is incorrect because the ip access-group command must be applied under the interface configuration mode, not global config. Applying it globally would be invalid.
Quick Answer
The correct order is to first create the extended ACL with the specific deny statement for Telnet traffic from 192.168.1.0/24 to 10.0.0.0/24, then add a permit ip any any statement, and finally enter interface G0/0 to apply it inbound using the ip access-group command. This sequence is critical because the ACL must exist in the router’s configuration before it can be referenced on an interface; applying a non-existent ACL would generate an error. On the CCNA 200-301 v2 exam, this drag-and-drop task tests your understanding of the extended ACL configuration order of operations, emphasizing that the most specific deny rule must come before the implicit deny any, and that the permit ip any any is necessary to allow all other traffic. A common trap is applying the ACL to the interface before creating it, or forgetting the permit statement, which would block all traffic. Remember the mnemonic “Create, Permit, Interface, Apply” — or simply “CPI-A” — to lock in the correct sequence.
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 router's G0/0 interface.
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 deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, permit ip any any, then enter interface G0/0, apply ip access-group <acl-number> in
First enter global config, then create 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 interface G0/0, then apply ACL inbound. This order ensures the ACL is created before being applied, and the specific source/destination networks match the requirement.
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 deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, permit ip any any, then enter interface G0/0, apply ip access-group <acl-number> in
- ✓
Enter interface G0/0, apply ip access-group <acl-number> in, then create ACL with deny tcp any any eq telnet, permit ip any any
Why this is correct
This is incorrect because the ACL must be created before it can be applied to an interface. Applying a non-existent ACL would result in an error.
Related concept
Authentication checks who the user is.
- ✓
Enter global configuration mode, create ACL with permit ip any any, deny tcp any any eq telnet, then enter interface G0/0, apply ip access-group <acl-number> in
- ✓
Enter global configuration mode, create ACL with deny tcp any any eq telnet, permit ip any any, then apply ip access-group <acl-number> in without entering interface
Why this is correct
This is incorrect because the ip access-group command must be applied under the interface configuration mode, not global config. Applying it globally would be invalid.
Related concept
Authentication checks who the user is.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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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Network Services and Security — study guide chapter
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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 deny tcp 192.168.1.0 0.0.0.255 10.0.0.0 0.0.0.255 eq telnet, permit ip any any, then enter interface G0/0, apply ip access-group <acl-number> in — First enter global config, then create 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 interface G0/0, then apply ACL inbound. This order ensures the ACL is created before being applied, and the specific source/destination networks match the requirement.
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.
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 →
Same concept, more angles
5 more ways this is tested on 200-301
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. Drag and drop the following steps into the correct order to plan, configure, and apply an extended ACL that permits only HTTP traffic from the 192.168.1.0/24 network to the server 10.0.0.10, applied inbound on interface GigabitEthernet0/1.
medium- ✓ A.1. Enter global configuration mode 2. Create the ACL with permit tcp 192.168.1.0 0.0.0.255 host 10.0.0.10 eq www 3. Enter interface configuration mode for GigabitEthernet0/1 4. Apply the ACL inbound with ip access-group ACL_NAME in 5. Exit configuration mode and verify with show access-lists
- B.1. Enter interface configuration mode for GigabitEthernet0/1 2. Apply the ACL inbound with ip access-group ACL_NAME in 3. Enter global configuration mode 4. Create the ACL with permit tcp 192.168.1.0 0.0.0.255 host 10.0.0.10 eq www 5. Exit configuration mode and verify with show access-lists
- C.1. Enter global configuration mode 2. Enter interface configuration mode for GigabitEthernet0/1 3. Apply the ACL inbound with ip access-group ACL_NAME in 4. Create the ACL with permit tcp 192.168.1.0 0.0.0.255 host 10.0.0.10 eq www 5. Exit configuration mode and verify with show access-lists
- D.1. Enter global configuration mode 2. Create the ACL with permit tcp 192.168.1.0 0.0.0.255 host 10.0.0.10 eq www 3. Exit configuration mode and verify with show access-lists 4. Enter interface configuration mode for GigabitEthernet0/1 5. Apply the ACL inbound with ip access-group ACL_NAME in
Why A: After entering config mode, create the ACL to allow HTTP from the specified network to the server. Apply it inbound on the correct interface. Then exit and verify.
Variation 2. 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.
medium- ✓ 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.
- 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.
- 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.
- 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 A: 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.
Variation 3. Drag and drop the following steps into the correct order to plan, configure, and apply an extended ACL that denies Telnet from a specific host to a server subnet, then verify the configuration.
medium- ✓ A.Enter global configuration mode, create the extended ACL with the deny statement for Telnet from the specific host to the server subnet, then permit other traffic.
- ✓ B.Apply the ACL to the inbound direction of the interface closest to the source host.
- ✓ C.Save the running configuration to startup configuration using 'copy running-config startup-config'.
- ✓ D.Verify the ACL configuration using 'show access-lists' and test Telnet access from the host.
Why A: The correct sequence is: create the ACL (A), apply it to the interface (B), verify it works (D), then save the configuration (C). This prevents saving a faulty ACL. Verifying after saving (C before D) risks persisting errors and is not the Cisco recommended workflow.
Variation 4. Drag and drop the following steps into the correct order to plan, configure, and apply an extended ACL that permits only HTTP traffic from the 192.168.1.0/24 network to the server at 10.0.0.100, and then verify the configuration.
medium- ✓ A.Enter global configuration mode, create the ACL with a permit statement for HTTP from 192.168.1.0/24 to 10.0.0.100, apply it inbound on the interface facing the 192.168.1.0/24 network, save the configuration, and verify with show access-lists.
- B.Enter global configuration mode, create the ACL with a permit statement for HTTP from 192.168.1.0/24 to 10.0.0.100, apply it outbound on the interface facing the server, save the configuration, and verify with show ip interface.
- C.Enter interface configuration mode, create the ACL with a permit statement for HTTP from 192.168.1.0/24 to 10.0.0.100, apply it inbound on the same interface, save the configuration, and verify with show running-config.
- D.Enter global configuration mode, create the ACL with a deny statement for HTTP from 192.168.1.0/24 to 10.0.0.100, apply it inbound on the interface facing the server, save the configuration, and verify with show access-lists.
Why A: First, enter config mode. Then create the ACL allowing HTTP from the source network to the destination host. Apply it inbound on the appropriate interface. Save and verify the configuration.
Variation 5. Drag and drop the following steps into the correct order to plan, configure, and apply an extended ACL that permits web traffic from the 10.1.1.0/24 network to the server 192.168.2.10 while blocking all other traffic inbound on GigabitEthernet0/1.
medium- ✓ A.Step 1: Define the ACL with permit and deny statements. Step 2: Apply the ACL inbound on GigabitEthernet0/1. Step 3: Verify the ACL configuration.
- B.Step 1: Apply the ACL inbound on GigabitEthernet0/1. Step 2: Define the ACL with permit and deny statements. Step 3: Verify the ACL configuration.
- C.Step 1: Define the ACL with permit and deny statements. Step 2: Verify the ACL configuration. Step 3: Apply the ACL inbound on GigabitEthernet0/1.
- D.Step 1: Apply the ACL inbound on GigabitEthernet0/1. Step 2: Verify the ACL configuration. Step 3: Define the ACL with permit and deny statements.
Why A: ACL configuration requires defining permit/deny statements first, then applying to the interface inbound, and finally verification.
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Last reviewed: Jun 6, 2026
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