The answer is that Telnet from 192.168.1.0/24 would be denied, and SSH from 10.0.0.0/8 would be denied. This conclusion is drawn by interpreting the show access-lists output, where the ACL processes entries sequentially: the first match for a packet determines its action, and subsequent entries are ignored. Since 192.168.1.0/24 is not within the permitted 10.0.0.0/8 range for Telnet, it falls to the deny any any eq 23 entry, which has 8 matches confirming such denials. Similarly, SSH from 10.0.0.0/8 does not match the permit for 172.16.0.0/16, so it hits the deny any any eq 22 entry, with 1 match indicating a single denied SSH packet. On the ENCOR 350-401 exam, decoding ACL match counts tests your ability to trace packet flow through an ordered list, a common trap being the assumption that a permit entry for one source implicitly permits all others. Remember: ACLs are a first-match-wins filter, not a whitelist—if your source isn’t explicitly permitted, it’s implicitly denied by the next matching deny statement.
350-401 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 access-lists
Extended IP access list 150
10 permit tcp 10.0.0.0 0.255.255.255 any eq 23 (2 matches)
20 deny tcp any any eq 23 (8 matches)
30 permit tcp 172.16.0.0 0.0.255.255 any eq 22 (4 matches)
40 deny tcp any any eq 22 (1 match)
50 permit ip any any (15 matches)
Telnet from 192.168.1.0/24 would be denied, and SSH from 10.0.0.0/8 would be denied.
Telnet from 192.168.1.0/24 matches entry 20 (deny), and SSH from 10.0.0.0/8 does not match entry 30 (which permits only from 172.16.0.0/16), so it matches entry 40 (deny).
B
Telnet from 10.0.0.0/8 is denied.
Why wrong: Entry 10 permits Telnet from 10.0.0.0/8.
C
SSH from 172.16.0.0/16 is denied.
Why wrong: Entry 30 permits SSH from 172.16.0.0/16.
D
All traffic is permitted.
Why wrong: Telnet and SSH from unauthorized sources are denied.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Telnet from 192.168.1.0/24 would be denied, and SSH from 10.0.0.0/8 would be denied.
ACL 150 permits Telnet (port 23) from 10.0.0.0/8, denies Telnet from all other sources, permits SSH (port 22) from 172.16.0.0/16, denies SSH from all other sources, and permits all other IP traffic. The match counts show 2 Telnet packets from 10.x.x.x, 8 denied Telnet packets from other sources, 4 SSH packets from 172.16.x.x, 1 denied SSH packet from another source, and 15 other packets. The correct answer is that Telnet from 192.168.1.0/24 would be denied, and SSH from 10.0.0.0/8 would be denied because it does not match the SSH permit entry.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Telnet from 192.168.1.0/24 would be denied, and SSH from 10.0.0.0/8 would be denied.
Why this is correct
Telnet from 192.168.1.0/24 matches entry 20 (deny), and SSH from 10.0.0.0/8 does not match entry 30 (which permits only from 172.16.0.0/16), so it matches entry 40 (deny).
Telnet and SSH from unauthorized sources are denied.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-401 ACL questions on filtering logic and placement.
ACLs and CoPP — This question tests ACLs and CoPP — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Telnet from 192.168.1.0/24 would be denied, and SSH from 10.0.0.0/8 would be denied. — ACL 150 permits Telnet (port 23) from 10.0.0.0/8, denies Telnet from all other sources, permits SSH (port 22) from 172.16.0.0/16, denies SSH from all other sources, and permits all other IP traffic. The match counts show 2 Telnet packets from 10.x.x.x, 8 denied Telnet packets from other sources, 4 SSH packets from 172.16.x.x, 1 denied SSH packet from another source, and 15 other packets. The correct answer is that Telnet from 192.168.1.0/24 would be denied, and SSH from 10.0.0.0/8 would be denied because it does not match the SSH permit entry.
What should I do if I get this 350-401 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-401 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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 access-lists
Extended IP access list 101
10 permit tcp host 10.1.1.1 host 192.168.1.100 eq 80 (4 matches)
20 deny tcp any host 192.168.1.100 eq 80 (12 matches)
30 permit ip any any (8 matches)
Based on this output, what can be concluded?
medium
✓ A.HTTP traffic from 10.1.1.1 to 192.168.1.100 is permitted, but all other HTTP traffic to that host is denied.
B.All HTTP traffic to 192.168.1.100 is denied.
C.All traffic from 10.1.1.1 to 192.168.1.100 is permitted.
D.The ACL is applied inbound on an interface.
Why A: ACL 101 has three entries. The first permits HTTP from a specific host, the second denies HTTP from any source to that host, and the third permits all other IP traffic. The match counts show that 4 packets matched the permit, 12 matched the deny, and 8 matched the final permit. The correct answer is that HTTP traffic from 10.1.1.1 to 192.168.1.100 is permitted, but all other HTTP traffic to that host is denied.
Variation 2. A network engineer runs the following command on Router R1:
R1# show ip access-lists
Extended IP access list 120
10 permit tcp 10.0.0.0 0.255.255.255 any eq 22 (5 matches)
20 permit tcp 172.16.0.0 0.0.255.255 any eq 22 (3 matches)
30 deny tcp any any eq 22 (2 matches)
40 permit ip any any (10 matches)
Based on this output, what can be concluded?
medium
✓ A.SSH access from 192.168.1.0/24 would be denied.
B.SSH access from 10.0.0.0/8 is denied.
C.All SSH traffic is permitted.
D.The ACL has an implicit deny at the end.
Why A: ACL 120 permits SSH (port 22) from 10.0.0.0/8 and 172.16.0.0/16, denies SSH from all other sources, and permits all other IP traffic. The match counts show 5 SSH packets from 10.x.x.x, 3 from 172.16.x.x, 2 denied SSH packets from other sources, and 10 other packets permitted. The correct answer is that SSH access from 192.168.1.0/24 would be denied.
Variation 3. A network engineer runs the following command on Router R1:
R1# show access-lists 130
Extended IP access list 130
10 permit icmp host 10.1.1.1 any echo (8 matches)
20 permit icmp host 10.1.1.1 any echo-reply (5 matches)
30 deny icmp any any (3 matches)
40 permit ip any any (12 matches)
Based on this output, what can be concluded?
medium
✓ A.ICMP packets from sources other than 10.1.1.1 are denied.
B.All ICMP traffic is permitted.
C.The ACL permits all traffic from 10.1.1.1.
D.The ACL is applied inbound on an interface.
Why A: ACL 130 permits ICMP echo and echo-reply only from host 10.1.1.1, denies all other ICMP, and permits all other IP traffic. The match counts show 8 echo packets from 10.1.1.1, 5 echo-reply packets from 10.1.1.1, 3 denied ICMP packets from other sources, and 12 other packets permitted. The correct answer is that ICMP packets from sources other than 10.1.1.1 are denied.
Last reviewed: Jun 18, 2026
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