The correct answer is HTTP and HTTPS traffic from the 192.168.1.0/24 network. This is because the access control list (ACL) applied outbound on GigabitEthernet0/0 explicitly permits TCP traffic sourced from the 192.168.1.0/24 subnet to any destination, but only when the destination port matches 80 for HTTP or 443 for HTTPS. Standard ACLs filter based solely on source IP, but this scenario uses an extended ACL—commonly tested on the ENCOR 350-401—where you must evaluate both source and destination port conditions. A common trap is forgetting that outbound ACLs inspect traffic leaving the interface, so the source is the internal network, not the destination. To remember, think “outbound ACLs protect the outside from your inside,” and for port numbers, recall “80 is the web’s gate, 443 is the secure mate.”
CCNP Infrastructure Practice Question
This 350-401 practice question tests your understanding of infrastructure. 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.
Exhibit
Refer to the exhibit.
! Running-config on R1
ip access-list extended FILTER
permit tcp 192.168.1.0 0.0.0.255 any eq www
permit tcp 192.168.1.0 0.0.0.255 any eq https
!
interface GigabitEthernet0/0
ip access-group FILTER out
!
Based on the exhibit, which traffic will be permitted outbound on GigabitEthernet0/0?
Refer to the exhibit.
! Running-config on R1
ip access-list extended FILTER
permit tcp 192.168.1.0 0.0.0.255 any eq www
permit tcp 192.168.1.0 0.0.0.255 any eq https
!
interface GigabitEthernet0/0
ip access-group FILTER out
!
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
HTTP and HTTPS traffic from 192.168.1.0/24
The exhibit shows an access control list (ACL) applied outbound on GigabitEthernet0/0. The ACL permits TCP traffic from source 192.168.1.0/24 to any destination with a destination port of 80 (HTTP) or 443 (HTTPS). Therefore, only HTTP and HTTPS traffic from the 192.168.1.0/24 network is permitted outbound.
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.
Common exam trap: answer the scenario, not the keyword
Cisco often tests the implicit deny any at the end of an ACL, leading candidates to assume that traffic not explicitly denied is permitted, when in fact only explicitly permitted traffic is allowed.
Detailed technical explanation
How to think about this question
Standard and extended ACLs evaluate packets sequentially; the first matching permit or deny statement is applied. The implicit deny any at the end of every ACL means any traffic not explicitly permitted is dropped. In this scenario, the ACL only permits TCP traffic with destination ports 80 and 443, so all other protocols and ports are denied. Real-world network administrators often use object groups or named ACLs to simplify management, but the underlying logic remains the same.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Infrastructure — This question tests Infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: HTTP and HTTPS traffic from 192.168.1.0/24 — The exhibit shows an access control list (ACL) applied outbound on GigabitEthernet0/0. The ACL permits TCP traffic from source 192.168.1.0/24 to any destination with a destination port of 80 (HTTP) or 443 (HTTPS). Therefore, only HTTP and HTTPS traffic from the 192.168.1.0/24 network is permitted outbound.
What should I do if I get this 350-401 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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