The answer is that HTTP traffic from sources outside 192.168.1.0/24 is denied. This conclusion follows from interpreting the ACL show access-list interpretation inbound on GigabitEthernet0/0: the ACL first permits TCP from the 192.168.1.0/24 subnet to any destination on port 80, then explicitly denies all other HTTP traffic, and finally permits all other IP traffic. The match counters confirm this logic—100 hits on the permit line for the subnet, 50 hits on the deny line for outside HTTP sources, and 200 hits on the final permit for non-HTTP traffic. On the ENCOR 350-401 exam, this tests your ability to read ACL sequence order and match counters, a common trap being that a later permit any any does not override an earlier explicit deny for a specific protocol. A useful memory tip: ACLs are processed top-down, so a deny for a specific service (like HTTP) will block that service from all sources not explicitly permitted earlier, regardless of a catch-all permit later.
CCNP ACLs and CoPP Practice Question
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 ip interface GigabitEthernet0/0 | include access list
Inbound access list is 101
Outbound access list is not set
R1# show access-lists 101
Extended IP access list 101
10 permit tcp 192.168.1.0 0.0.0.255 any eq 80 (100 matches)
20 deny tcp any any eq 80 (50 matches)
30 permit ip any any (200 matches)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
HTTP traffic from sources outside 192.168.1.0/24 is denied.
ACL 101 is applied inbound on GigabitEthernet0/0. It permits HTTP from subnet 192.168.1.0/24 to any destination, denies all other HTTP, and permits all other IP traffic. The match counts show 100 HTTP packets from the subnet, 50 denied HTTP packets from other sources, and 200 other packets permitted. The correct answer is that HTTP traffic from sources outside 192.168.1.0/24 is denied.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
HTTP traffic from sources outside 192.168.1.0/24 is denied.
Why this is correct
Entry 20 denies all HTTP traffic not matching entry 10, so any HTTP from other subnets is denied.
Entry 20 denies HTTP from sources not in 192.168.1.0/24.
✗
The ACL is applied outbound on the interface.
Why it's wrong here
The output clearly states 'Inbound access list is 101'.
✗
The ACL permits all traffic from 192.168.1.0/24.
Why it's wrong here
It only permits HTTP (port 80) from that subnet, not all traffic.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Trap categories for this question
Command / output trap
The output clearly states 'Inbound access list is 101'.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-401 subnetting questions on CIDR, address ranges, and subnet selection.
ACLs and CoPP — This question tests ACLs and CoPP — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: HTTP traffic from sources outside 192.168.1.0/24 is denied. — ACL 101 is applied inbound on GigabitEthernet0/0. It permits HTTP from subnet 192.168.1.0/24 to any destination, denies all other HTTP, and permits all other IP traffic. The match counts show 100 HTTP packets from the subnet, 50 denied HTTP packets from other sources, and 200 other packets permitted. The correct answer is that HTTP traffic from sources outside 192.168.1.0/24 is denied.
What should I do if I get this 350-401 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-401 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command on Router R1:
R1# show ip interface GigabitEthernet0/1 | include access list
Inbound access list is not set
Outbound access list is 140
R1# show access-lists 140
Extended IP access list 140
10 permit tcp 192.168.1.0 0.0.0.255 any eq 443 (25 matches)
20 deny tcp any any eq 443 (10 matches)
30 permit ip any any (50 matches)
Based on this output, what can be concluded?
medium
✓ A.HTTPS traffic from sources outside 192.168.1.0/24 is denied when exiting the interface.
B.All HTTPS traffic is permitted outbound.
C.The ACL is applied inbound on the interface.
D.The ACL permits all traffic from 192.168.1.0/24.
Why A: ACL 140 is applied outbound on GigabitEthernet0/1. It permits HTTPS (port 443) from subnet 192.168.1.0/24 to any destination, denies all other HTTPS, and permits all other IP traffic. The match counts show 25 HTTPS packets from the subnet, 10 denied HTTPS packets from other sources, and 50 other packets permitted. The correct answer is that HTTPS traffic from sources outside 192.168.1.0/24 is denied when exiting the interface.
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Question Discussion
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