The answer is that the ACL permits HTTP and HTTPS traffic to server 10.0.1.100 and denies all other traffic. This is correct because the ACL contains two permit statements: one for TCP port 80 (HTTP) and one for TCP port 443 (HTTPS), both specifying the destination host 10.0.1.100, followed by an implicit deny all at the end. On the ISC2 Certified in Cybersecurity CC exam, this tests your ability to interpret access control list logic, a common topic in network security controls. A frequent trap is forgetting that ACLs have an implicit deny rule, so any traffic not explicitly permitted—like SSH or ICMP—is blocked. To remember, think of the ACL as a bouncer with a strict guest list: only HTTP and HTTPS get in, everyone else is turned away.
ISC2 CC Security Principles Practice Question
This CC practice question tests your understanding of security principles. 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
Firewall configuration snippet:
access-list 101 permit tcp any host 10.0.1.100 eq 80
access-list 101 permit tcp any host 10.0.1.100 eq 443
access-list 101 deny ip any any log
Refer to the exhibit. What is the effect of this ACL?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Allows HTTP and HTTPS traffic to server 10.0.1.100, denies all other traffic
The ACL permits HTTP (port 80) and HTTPS (port 443) traffic from any source to host 10.0.1.100, and explicitly denies all other traffic.
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.
Incorrect. Only HTTP/HTTPS are permitted; other protocols are denied.
✓
Allows HTTP and HTTPS traffic to server 10.0.1.100, denies all other traffic
Why this is correct
Correct. The two permit lines allow those protocols; the deny all blocks everything else.
Related concept
Standard ACLs match source addresses.
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 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. 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. 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.
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 CC ACL questions on filtering logic and placement.
Security Principles — This question tests Security Principles — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Allows HTTP and HTTPS traffic to server 10.0.1.100, denies all other traffic — The ACL permits HTTP (port 80) and HTTPS (port 443) traffic from any source to host 10.0.1.100, and explicitly denies all other traffic.
What should I do if I get this CC 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 CC ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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