This 350-401 practice question tests your understanding of acls and copp. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
A network engineer runs the following command on Router R1:
R1# show access-lists 130
Extended IP access list 130
10 permit icmp host 10.1.1.1 any echo (8 matches)
20 permit icmp host 10.1.1.1 any echo-reply (5 matches)
30 deny icmp any any (3 matches)
40 permit ip any any (12 matches)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ICMP packets from sources other than 10.1.1.1 are denied.
ACL 130 permits ICMP echo and echo-reply only from host 10.1.1.1, denies all other ICMP, and permits all other IP traffic. The match counts show 8 echo packets from 10.1.1.1, 5 echo-reply packets from 10.1.1.1, 3 denied ICMP packets from other sources, and 12 other packets permitted. The correct answer is that ICMP packets from sources other than 10.1.1.1 are denied.
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.
✓
ICMP packets from sources other than 10.1.1.1 are denied.
Why this is correct
Entry 30 denies all ICMP not matching entries 10 or 20, so any ICMP from other sources is denied.
Related concept
Standard ACLs match source addresses.
✗
All ICMP traffic is permitted.
Why it's wrong here
Only ICMP from 10.1.1.1 is permitted; other ICMP is denied.
✗
The ACL permits all traffic from 10.1.1.1.
Why it's wrong here
It only permits ICMP echo and echo-reply from that host, not all traffic.
✗
The ACL is applied inbound on an interface.
Why it's wrong here
The output does not indicate the direction or interface.
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
The output does not indicate the direction or interface.
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 350-401 ACL questions on filtering logic and placement.
ACLs and CoPP — This question tests ACLs and CoPP — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: ICMP packets from sources other than 10.1.1.1 are denied. — ACL 130 permits ICMP echo and echo-reply only from host 10.1.1.1, denies all other ICMP, and permits all other IP traffic. The match counts show 8 echo packets from 10.1.1.1, 5 echo-reply packets from 10.1.1.1, 3 denied ICMP packets from other sources, and 12 other packets permitted. The correct answer is that ICMP packets from sources other than 10.1.1.1 are denied.
What should I do if I get this 350-401 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 350-401 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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