- A
Only SSH connections to the router are permitted; all other IP traffic is denied inbound on this interface.
The ACL permits TCP port 22 (SSH) and denies all other IP traffic, applied inbound. This restricts management access to SSH only.
- B
The ACL permits SSH and HTTP traffic to the router; all other traffic is denied.
Why wrong: The ACL only permits TCP port 22 (SSH), not HTTP (port 80).
- C
The ACL is applied outbound, so it filters traffic leaving the interface; SSH is permitted outbound.
Why wrong: The 'ip access-group MY_ACL in' applies the ACL inbound, not outbound.
- D
The ACL has no effect because it is missing a 'permit ip any any' statement.
Why wrong: The ACL explicitly denies all other traffic with 'deny ip any any', which is effective. No further permit is needed for the intended restriction.
Quick Answer
The answer is that only SSH connections to the router are permitted, with all other inbound IP traffic denied on that interface. This is correct because the ACL 100, applied inbound via the `ip access-group MY_ACL in` command on GigabitEthernet0/1, explicitly permits TCP traffic to the router’s IP address 192.168.1.1 on port 22 (SSH) and then uses a deny any any statement to block everything else. In the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of how an inbound ACL on a router interface filters traffic destined for the router itself, not just traffic passing through—a common trap is forgetting that the `in` direction applies to traffic entering the interface, including management traffic. The key takeaway is that the ACL’s permit entry for SSH must match the router’s own IP and port, while the implicit deny at the end ensures no other protocols sneak in. Memory tip: “SSH in, all else out” — think of the ACL as a bouncer checking for port 22 before locking the door.
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. 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.
Examine the following partial configuration on a Cisco IOS-XE router:
interface GigabitEthernet0/1 ip address 192.168.1.1 255.255.255.0 ip access-group MY_ACL in
!
access-list 100 permit tcp any host 192.168.1.1 eq 22 access-list 100 deny ip any any
!
line vty 0 4
transport input ssh login local !
username admin privilege 15 secret cisco
What is the effect of this configuration?
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
Only SSH connections to the router are permitted; all other IP traffic is denied inbound on this interface.
The ACL 100 is applied inbound on GigabitEthernet0/1 via the 'ip access-group MY_ACL in' command. It explicitly permits TCP traffic to host 192.168.1.1 on port 22 (SSH) and then denies all other IP traffic. Since the router's own IP address is 192.168.1.1, this allows only SSH management access from any source, while blocking all other inbound traffic to the router or through the interface.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Only SSH connections to the router are permitted; all other IP traffic is denied inbound on this interface.
- ✗
The ACL permits SSH and HTTP traffic to the router; all other traffic is denied.
- ✗
The ACL is applied outbound, so it filters traffic leaving the interface; SSH is permitted outbound.
Why it's wrong here
The 'ip access-group MY_ACL in' applies the ACL inbound, not outbound.
- ✗
The ACL has no effect because it is missing a 'permit ip any any' statement.
Why it's wrong here
The ACL explicitly denies all other traffic with 'deny ip any any', which is effective. No further permit is needed for the intended restriction.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between inbound and outbound ACL application, and candidates may mistakenly think the 'in' keyword means 'into the router' for management traffic only, or they may overlook that the ACL is applied to the interface and filters all IP traffic, not just management plane traffic.
Detailed technical explanation
How to think about this question
When an ACL is applied inbound on a router interface, it filters traffic before the router makes a routing decision; for traffic destined to the router itself, the ACL checks against the router's IP address. The 'host 192.168.1.1' keyword matches only packets with that exact destination IP, which is the router's interface address, ensuring only SSH management sessions are allowed. In real-world scenarios, this is a common security best practice to restrict management access to a specific protocol and source, but note that the ACL does not filter traffic sourced from the router (e.g., outbound SSH from the router) because it is inbound only.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Only SSH connections to the router are permitted; all other IP traffic is denied inbound on this interface. — The ACL 100 is applied inbound on GigabitEthernet0/1 via the 'ip access-group MY_ACL in' command. It explicitly permits TCP traffic to host 192.168.1.1 on port 22 (SSH) and then denies all other IP traffic. Since the router's own IP address is 192.168.1.1, this allows only SSH management access from any source, while blocking all other inbound traffic to the router or through the interface.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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