This CC practice question tests your understanding of network security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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
access-list 100 deny ip 10.0.1.0 0.0.0.255 any log
access-list 100 permit tcp any host 192.168.1.100 eq 80
access-list 100 deny ip any any
Refer to the exhibit. Based on the exhibit, which traffic will be permitted?
access-list 100 deny ip 10.0.1.0 0.0.0.255 any log
access-list 100 permit tcp any host 192.168.1.100 eq 80
access-list 100 deny ip any any
A
All traffic from 192.168.1.100
Why wrong: The access list is inbound; it controls traffic to 192.168.1.100, not from it. Also, the permit entry only allows specific traffic to that host.
B
All traffic from 10.0.1.0/24
Why wrong: The first deny statement blocks all IP traffic from 10.0.1.0/24 to any destination.
C
SSH traffic from any source to 192.168.1.100
Why wrong: SSH uses TCP port 22, which is not permitted; only port 80 is allowed.
D
HTTP traffic from any source to 192.168.1.100
The permit statement allows TCP port 80 (HTTP) traffic to host 192.168.1.100 from any source.
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 any source to 192.168.1.100
The exhibit shows an access control list (ACL) that permits TCP traffic from any source to destination host 192.168.1.100 on port 80 (HTTP). The ACL entry is `permit tcp any host 192.168.1.100 eq 80`, which matches only HTTP traffic. Therefore, only HTTP traffic from any source to 192.168.1.100 is permitted.
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 traffic from 192.168.1.100
Why it's wrong here
The access list is inbound; it controls traffic to 192.168.1.100, not from it. Also, the permit entry only allows specific traffic to that host.
✗
All traffic from 10.0.1.0/24
Why it's wrong here
The first deny statement blocks all IP traffic from 10.0.1.0/24 to any destination.
✗
SSH traffic from any source to 192.168.1.100
Why it's wrong here
SSH uses TCP port 22, which is not permitted; only port 80 is allowed.
✓
HTTP traffic from any source to 192.168.1.100
Why this is correct
The permit statement allows TCP port 80 (HTTP) traffic to host 192.168.1.100 from any source.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between source and destination in ACL statements, and the trap here is that candidates misread the ACL as permitting traffic from 192.168.1.100 (source) rather than to it (destination), or confuse the port number (80 for HTTP vs. 22 for SSH).
Detailed technical explanation
How to think about this question
Cisco ACLs use implicit deny at the end, so only traffic matching an explicit permit statement is allowed. The `eq` keyword matches the destination port for TCP or UDP; here `eq 80` restricts to HTTP. In real-world scenarios, such an ACL might be applied inbound on an interface to allow web access to a server while blocking other services, requiring additional entries for SSH or management if needed.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CC question in full detail.
Network Security — This question tests Network Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: HTTP traffic from any source to 192.168.1.100 — The exhibit shows an access control list (ACL) that permits TCP traffic from any source to destination host 192.168.1.100 on port 80 (HTTP). The ACL entry is `permit tcp any host 192.168.1.100 eq 80`, which matches only HTTP traffic. Therefore, only HTTP traffic from any source to 192.168.1.100 is permitted.
What should I do if I get this CC 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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