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 GigabitEthernet0/1 | 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)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
HTTPS traffic from sources outside 192.168.1.0/24 is denied when exiting the interface.
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.
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.
✓
HTTPS traffic from sources outside 192.168.1.0/24 is denied when exiting the interface.
Why this is correct
Entry 20 denies HTTPS from any source not matching entry 10, so HTTPS from other subnets is denied outbound.
It only permits HTTPS 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 shows 'Outbound access list is 140'.
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: HTTPS traffic from sources outside 192.168.1.0/24 is denied when exiting the interface. — 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.
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.
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Question Discussion
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