- A
Configure 'no ip unreachables' on the interface.
Why wrong: Incorrect. The 'no ip unreachables' command disables ICMP unreachable messages (e.g., host/network unreachable), not ICMP echo replies.
- B
Apply an inbound access-list on the interface that denies ICMP echo requests.
Correct. An inbound access-list that denies ICMP echo (type 8) will drop incoming ping requests, preventing the router from responding.
- C
Configure 'no ip redirects' on the interface.
Why wrong: Incorrect. The 'no ip redirects' command disables ICMP redirect messages, not echo replies.
- D
Configure 'no ip proxy-arp' on the interface.
Why wrong: Incorrect. The 'no ip proxy-arp' disables proxy ARP, which is unrelated to ICMP echo replies.
- E
Configure 'ip icmp echo-reply disable' globally.
Correct. The 'ip icmp echo-reply disable' global command disables the router from sending ICMP echo replies, effectively preventing responses to pings.
Quick Answer
The correct answers are the global command 'ip icmp echo-reply disable' and an inbound access-list with a deny rule for ICMP echo requests. The global command completely disables the router from generating ICMP echo replies on all interfaces, directly addressing the requirement to stop responses to ping. An inbound access-list applied to the interface with a deny statement for ICMP type 8 (echo) blocks the incoming request before the router can process it, effectively preventing the reply. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish between ICMP control-plane features and interface-level traffic filtering—a common trap is confusing 'no ip unreachables' or 'no ip redirects' with echo reply suppression, as those commands affect different ICMP message types. Remember that 'unreachables' and 'redirects' are about error messages, not echo responses. A useful memory tip: think of the global command as a "master switch" for ping replies, while the access-list is a "selective bouncer" at the door.
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 TWO actions will prevent a Cisco IOS router from responding to ICMP echo requests on an interface? (Choose TWO.)
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
Apply an inbound access-list on the interface that denies ICMP echo requests.
The 'no ip unreachables' command disables ICMP unreachable messages but does not affect echo replies. The 'no ip redirects' disables ICMP redirects. The 'no ip proxy-arp' disables proxy ARP. The 'access-group' with a deny rule for ICMP echo can block the replies. The 'ip icmp echo-reply disable' global command disables all ICMP echo replies. The 'ip access-group' applied outbound on the interface would affect traffic leaving, not incoming echo requests.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure 'no ip unreachables' on the interface.
Why it's wrong here
Incorrect. The 'no ip unreachables' command disables ICMP unreachable messages (e.g., host/network unreachable), not ICMP echo replies.
- ✓
Apply an inbound access-list on the interface that denies ICMP echo requests.
Why this is correct
Correct. An inbound access-list that denies ICMP echo (type 8) will drop incoming ping requests, preventing the router from responding.
Related concept
Standard ACLs match source addresses.
- ✗
Configure 'no ip redirects' on the interface.
Why it's wrong here
Incorrect. The 'no ip redirects' command disables ICMP redirect messages, not echo replies.
- ✗
Configure 'no ip proxy-arp' on the interface.
- ✓
Configure 'ip icmp echo-reply disable' globally.
Why this is correct
Correct. The 'ip icmp echo-reply disable' global command disables the router from sending ICMP echo replies, effectively preventing responses to pings.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
Incorrect. The 'no ip unreachables' command disables ICMP unreachable messages (e.g., host/network unreachable), not ICMP echo replies.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Management — This question tests Device Management — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Apply an inbound access-list on the interface that denies ICMP echo requests. — The 'no ip unreachables' command disables ICMP unreachable messages but does not affect echo replies. The 'no ip redirects' disables ICMP redirects. The 'no ip proxy-arp' disables proxy ARP. The 'access-group' with a deny rule for ICMP echo can block the replies. The 'ip icmp echo-reply disable' global command disables all ICMP echo replies. The 'ip access-group' applied outbound on the interface would affect traffic leaving, not incoming echo requests.
What should I do if I get this 300-410 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 18, 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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