- A
Incoming traffic from 192.168.1.0/24 to any destination on port 80 is permitted; all other incoming traffic is denied.
Correct. The ACL permits only HTTP traffic from the specified subnet and denies everything else.
- B
Outgoing traffic from the router to 192.168.1.0/24 on port 80 is permitted; all other outgoing traffic is denied.
Why wrong: Incorrect. The ACL is applied inbound (in), so it filters incoming traffic, not outgoing.
- C
Incoming traffic from any source to 192.168.1.0/24 on port 80 is permitted; all other incoming traffic is denied.
Why wrong: Incorrect. The source is 192.168.1.0/24, not the destination. The destination is 'any'.
- D
The access-list will permit all TCP traffic from 192.168.1.0/24, regardless of destination port.
Why wrong: Incorrect. The ACL specifically permits only port 80 (HTTP) traffic; other TCP ports are denied.
Quick Answer
The correct answer is that incoming traffic from 192.168.1.0/24 to any destination on port 80 is permitted, while all other incoming traffic is denied. This is because the inbound ACL configuration effect is to filter packets as they enter the interface, before any routing decision is made; the first access control entry (ACE) explicitly permits TCP traffic from the 192.168.1.0/24 source network to any destination on port 80, and the subsequent deny ip any any statement acts as an implicit catch-all, blocking all other traffic. On the ENCOR 350-401 exam, this scenario tests your understanding of ACL processing order and directionality—a common trap is forgetting that an inbound ACL evaluates traffic before it reaches the router’s routing table, so a permit statement must match the source, not the destination. A key memory tip is “inbound inspects the source, outbound inspects the destination,” helping you quickly recall that the permit rule applies to traffic coming from the specified source network.
CCNP Network Function Virtualization Practice Question
This 350-401 practice question tests your understanding of network function virtualization. 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.
Given the following configuration:
interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.0 ip access-group 101 in
!
access-list 101 permit tcp 192.168.1.0 0.0.0.255 any eq 80 access-list 101 deny ip any any
What is the effect of this configuration?
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
Incoming traffic from 192.168.1.0/24 to any destination on port 80 is permitted; all other incoming traffic is denied.
The configuration applies access-list 101 inbound on GigabitEthernet0/0. The first ACE permits TCP traffic from source network 192.168.1.0/24 to any destination on port 80 (HTTP). The second ACE denies all other IP traffic. Since the access list is applied in the inbound direction, it filters traffic entering the router through that interface. Therefore, only incoming traffic matching the permit statement is allowed; everything else 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.
- ✓
Incoming traffic from 192.168.1.0/24 to any destination on port 80 is permitted; all other incoming traffic is denied.
- ✗
Outgoing traffic from the router to 192.168.1.0/24 on port 80 is permitted; all other outgoing traffic is denied.
Why it's wrong here
Incorrect. The ACL is applied inbound (in), so it filters incoming traffic, not outgoing.
- ✗
Incoming traffic from any source to 192.168.1.0/24 on port 80 is permitted; all other incoming traffic is denied.
Why it's wrong here
Incorrect. The source is 192.168.1.0/24, not the destination. The destination is 'any'.
- ✗
The access-list will permit all TCP traffic from 192.168.1.0/24, regardless of destination port.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between inbound and outbound ACL application, and the trap here is confusing the direction of the access-group or misreading the source/destination in the ACL entries.
Detailed technical explanation
How to think about this question
Standard ACLs evaluate packets sequentially until a match is found; the implicit deny any at the end of every ACL is a fundamental behavior. The 'eq 80' operator matches only TCP segments with a destination port of 80, which is the well-known port for HTTP. In a real-world scenario, this ACL could be used to allow only HTTP traffic from a trusted management subnet while blocking all other inbound traffic, but note that it does not inspect state or allow return traffic—stateful inspection would require a reflexive ACL or a firewall.
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.
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FAQ
Questions learners often ask
What does this 350-401 question test?
Network Function Virtualization — This question tests Network Function Virtualization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Incoming traffic from 192.168.1.0/24 to any destination on port 80 is permitted; all other incoming traffic is denied. — The configuration applies access-list 101 inbound on GigabitEthernet0/0. The first ACE permits TCP traffic from source network 192.168.1.0/24 to any destination on port 80 (HTTP). The second ACE denies all other IP traffic. Since the access list is applied in the inbound direction, it filters traffic entering the router through that interface. Therefore, only incoming traffic matching the permit statement is allowed; everything else is denied.
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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Last reviewed: Jun 24, 2026
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