300-410 IPv4 Access Control Lists Practice Question
This 300-410 practice question tests your understanding of ipv4 access control lists. 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.
Consider the following partial configuration on router R1:
```
interface GigabitEthernet0/1
ip access-group MY_ACL in
!
ip access-list extended MY_ACL
permit tcp 10.1.1.0 0.0.0.255 any eq 80
permit icmp any any echo
deny ip any any
```
What is the effect of this ACL when applied inbound on GigabitEthernet0/1?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It permits HTTP requests from 10.1.1.0/24 and ICMP Echo requests from any source; all other IP traffic is denied.
The ACL is applied inbound on GigabitEthernet0/1. The first permit statement allows TCP traffic from source network 10.1.1.0/24 to any destination on port 80 (HTTP). The second permit statement allows ICMP Echo requests (type 8) from any source. The final deny statement blocks all other IP traffic. Therefore, only HTTP requests from 10.1.1.0/24 and ICMP Echo requests from any source are permitted; all other IP traffic is denied.
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.
✓
It permits HTTP requests from 10.1.1.0/24 and ICMP Echo requests from any source; all other IP traffic is denied.
Why this is correct
Correct. The ACL permits the specified traffic and denies all other IP traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
It permits HTTP requests from 10.1.1.0/24 and all ICMP traffic; all other IP traffic is denied.
Why it's wrong here
Incorrect. Only ICMP Echo requests are permitted, not all ICMP types.
✗
It permits HTTP requests from any source to 10.1.1.0/24 and ICMP Echo requests; all other traffic is denied.
Why it's wrong here
Incorrect. The source is 10.1.1.0/24, not the destination.
✗
It permits HTTP requests from 10.1.1.0/24 and ICMP Echo replies; all other IP traffic is denied.
Why it's wrong here
Incorrect. The ACL permits ICMP Echo requests, not replies.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between ICMP Echo request and Echo reply, and the trap here is that the 'echo' keyword in an ACL permits only Echo requests, not all ICMP traffic or Echo replies.
Detailed technical explanation
How to think about this question
In Cisco IOS, the 'echo' keyword in an ACL matches ICMP type 8 (Echo request), not type 0 (Echo reply). To permit Echo replies, you must use the 'echo-reply' keyword or specify type 0 explicitly. Additionally, ACLs are processed top-down; the implicit deny at the end is made explicit here with 'deny ip any any', which is good practice for clarity. This ACL is often used to allow outbound web traffic from a specific subnet while permitting ping sweeps for monitoring, but blocking all other inbound traffic.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
IPv4 Access Control Lists — This question tests IPv4 Access Control Lists — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It permits HTTP requests from 10.1.1.0/24 and ICMP Echo requests from any source; all other IP traffic is denied. — The ACL is applied inbound on GigabitEthernet0/1. The first permit statement allows TCP traffic from source network 10.1.1.0/24 to any destination on port 80 (HTTP). The second permit statement allows ICMP Echo requests (type 8) from any source. The final deny statement blocks all other IP traffic. Therefore, only HTTP requests from 10.1.1.0/24 and ICMP Echo requests from any source are permitted; all other IP traffic is denied.
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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Question Discussion
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