The correct answer is that HTTP and HTTPS traffic from the internal network is allowed, but SSH is denied. This is because the ACL applied outbound on the external interface contains explicit permit statements for TCP ports 80 and 443 from the 192.168.1.0/24 network, and the ACL’s implicit deny behavior at the end blocks all other traffic, including SSH on port 22, which does not match any permit rule. On the Cisco CyberOps Associate 200-201 exam, this concept tests your understanding of how ACLs process packets sequentially and that the implicit deny is the default catch-all rule, often tripping candidates who forget that SSH is not explicitly permitted. A common trap is assuming that because HTTP and HTTPS are allowed, other common services like SSH might also pass, but the implicit deny ensures only matched traffic is forwarded. Remember the memory tip: “Permit what you need, deny the rest—implicit deny is the final test.”
200-201 Network Intrusion Analysis Practice Question
This 200-201 practice question tests your understanding of network intrusion analysis. 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.
Exhibit
Refer to the exhibit.
Extended ACL 101:
10 permit tcp 192.168.1.0 0.0.0.255 any eq 80
20 permit tcp 192.168.1.0 0.0.0.255 any eq 443
30 deny tcp any any eq 22
40 permit ip any any
Interface GigabitEthernet0/0:
ip access-group 101 out
Refer to the exhibit. A security analyst reviews the ACL configuration applied outbound on the external interface. Which statement is true about traffic from the 192.168.1.0/24 network to the internet?
Refer to the exhibit.
Extended ACL 101:
10 permit tcp 192.168.1.0 0.0.0.255 any eq 80
20 permit tcp 192.168.1.0 0.0.0.255 any eq 443
30 deny tcp any any eq 22
40 permit ip any any
Interface GigabitEthernet0/0:
ip access-group 101 out
A
All outbound traffic is denied except HTTP and HTTPS.
Why wrong: Line 40 permits all traffic, so nothing is denied except SSH.
B
Only HTTP and HTTPS traffic is allowed.
Why wrong: Line 40 permits all other traffic, so more than just HTTP/HTTPS is allowed.
C
HTTP and HTTPS traffic from the internal network is allowed, but SSH is denied.
Lines 10 and 20 permit HTTP/HTTPS; line 30 denies SSH; line 40 permits everything else.
D
SSH traffic is only denied if it originates from the 192.168.1.0/24 network.
Why wrong: Line 30 denies SSH from any source, not just the internal network.
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 the internal network is allowed, but SSH is denied.
The ACL applied outbound on the external interface permits TCP traffic from the 192.168.1.0/24 network to any destination on ports 80 (HTTP) and 443 (HTTPS), and denies all other traffic, including SSH (port 22). Since the ACL has an implicit deny at the end, only HTTP and HTTPS are allowed; SSH is explicitly denied because it does not match any permit statement. Therefore, HTTP and HTTPS traffic from the internal network is allowed, but SSH 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.
✗
All outbound traffic is denied except HTTP and HTTPS.
Why it's wrong here
Line 40 permits all traffic, so nothing is denied except SSH.
✗
Only HTTP and HTTPS traffic is allowed.
Why it's wrong here
Line 40 permits all other traffic, so more than just HTTP/HTTPS is allowed.
✓
HTTP and HTTPS traffic from the internal network is allowed, but SSH is denied.
Why this is correct
Lines 10 and 20 permit HTTP/HTTPS; line 30 denies SSH; line 40 permits everything else.
Related concept
Read the scenario before looking for a memorised answer.
✗
SSH traffic is only denied if it originates from the 192.168.1.0/24 network.
Why it's wrong here
Line 30 denies SSH from any source, not just the internal network.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the implicit deny any at the end of an ACL, and the trap here is that candidates assume SSH is explicitly denied rather than understanding it is blocked by the implicit deny because it is not permitted.
Detailed technical explanation
How to think about this question
In Cisco ACLs, the implicit deny any at the end of the list blocks all traffic that does not match a permit statement, including SSH (TCP/22). The ACL is applied outbound on the external interface, meaning it filters traffic leaving the network; the source IP 192.168.1.0/24 is the internal network, and the destination 'any' covers all internet destinations. A real-world scenario is restricting guest networks to web-only access while blocking management protocols like SSH to enforce security policy.
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.
Network Intrusion Analysis — This question tests Network Intrusion Analysis — 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 the internal network is allowed, but SSH is denied. — The ACL applied outbound on the external interface permits TCP traffic from the 192.168.1.0/24 network to any destination on ports 80 (HTTP) and 443 (HTTPS), and denies all other traffic, including SSH (port 22). Since the ACL has an implicit deny at the end, only HTTP and HTTPS are allowed; SSH is explicitly denied because it does not match any permit statement. Therefore, HTTP and HTTPS traffic from the internal network is allowed, but SSH is denied.
What should I do if I get this 200-201 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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