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.
Examine the following configuration:
```
interface GigabitEthernet0/3
ip access-group WEB_ONLY out
!
ip access-list extended WEB_ONLY
permit tcp any any eq 80
permit tcp any any eq 443
```
What is the effect of this ACL when applied outbound on GigabitEthernet0/3?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It permits only HTTP and HTTPS traffic to leave the interface; all other traffic is denied.
The ACL named WEB_ONLY explicitly permits TCP traffic destined for ports 80 (HTTP) and 443 (HTTPS). When applied outbound on GigabitEthernet0/3, it filters traffic leaving the interface. Since every ACL has an implicit deny any at the end, only HTTP and HTTPS traffic is permitted outbound; all other 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 all web traffic entering the interface.
Why it's wrong here
Incorrect. The ACL is applied outbound, so it filters traffic leaving the interface.
✓
It permits only HTTP and HTTPS traffic to leave the interface; all other traffic is denied.
Why this is correct
Correct. The ACL permits web traffic and implicitly denies everything else.
Related concept
Read the scenario before looking for a memorised answer.
✗
It permits all TCP traffic to any destination.
Why it's wrong here
Incorrect. Only TCP traffic to ports 80 and 443 is permitted.
✗
It has no effect because the ACL is missing a deny statement.
Why it's wrong here
Incorrect. There is an implicit deny at the end of every ACL.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the implicit deny any concept and the distinction between inbound and outbound ACL application, causing candidates to overlook that an ACL without an explicit deny still denies all non-permitted traffic.
Detailed technical explanation
How to think about this question
Cisco ACLs use an implicit deny any rule at the end of every access list, meaning any traffic not explicitly permitted is dropped. The 'out' keyword in the ip access-group command applies the ACL to traffic exiting the interface, which is evaluated after the routing decision. In real-world scenarios, this ACL could be used to restrict outbound web traffic from a specific subnet while blocking other protocols like FTP or SSH.
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 only HTTP and HTTPS traffic to leave the interface; all other traffic is denied. — The ACL named WEB_ONLY explicitly permits TCP traffic destined for ports 80 (HTTP) and 443 (HTTPS). When applied outbound on GigabitEthernet0/3, it filters traffic leaving the interface. Since every ACL has an implicit deny any at the end, only HTTP and HTTPS traffic is permitted outbound; all other 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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