The correct answer is that HTTPS traffic from 10.0.1.0/24 to 192.168.2.100 is permitted, while all other HTTPS traffic is denied. This is because the ACL explicitly contains a permit statement for TCP port 443, which is the port used by HTTPS, from the specified source network to the specific destination host. Since every ACL ends with an implicit deny all rule, any HTTPS packet that does not match this exact permit condition is automatically dropped. On the ISC2 Certified in Cybersecurity CC exam, this question tests your understanding of how ACLs process traffic sequentially and the critical role of the implicit deny—a common trap is forgetting that the deny applies to all traffic not explicitly allowed. A helpful memory tip: “ACLs are like bouncers—they only let in the guests on the list, and everyone else is turned away at the door.”
ISC2 CC Business Continuity, DR & Incident Response Practice Question
This CC practice question tests your understanding of business continuity, dr & incident response. 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 permit tcp host 10.0.1.0 0.0.0.255 host 192.168.2.100 eq 443
access-list 100 deny tcp any any eq 443
access-list 100 permit ip any any
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
✓
HTTPS traffic from 10.0.1.0/24 to 192.168.2.100 is permitted; all other HTTPS is denied
The ACL explicitly permits HTTPS (TCP port 443) traffic from source network 10.0.1.0/24 to destination host 192.168.2.100. Since ACLs have an implicit deny all at the end, any HTTPS traffic not matching this permit statement is denied. Option C correctly states that only this specific traffic is permitted and all other HTTPS 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 HTTPS traffic is permitted
Why it's wrong here
The deny line blocks all other HTTPS except the permitted traffic.
✗
Only hosts from 10.0.1.0/24 can access HTTPS on 192.168.2.100
Why it's wrong here
This is true but incomplete; the ACL also denies HTTPS to other destinations.
✓
HTTPS traffic from 10.0.1.0/24 to 192.168.2.100 is permitted; all other HTTPS is denied
Why this is correct
This accurately describes the combined effect of the permit and deny statements.
Related concept
Read the scenario before looking for a memorised answer.
✗
The ACL is invalid due to ordering
Why it's wrong here
The ordering is correct; specific permit before the broad deny, followed by permit all.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the implicit deny any at the end of ACLs, causing candidates to forget that even if a permit statement exists, all other traffic is denied unless explicitly permitted.
Detailed technical explanation
How to think about this question
Standard and extended ACLs in Cisco IOS are processed top-down; the first matching rule is applied. The implicit deny any at the end of every ACL is a fundamental behavior defined in RFC 1700 and Cisco's implementation. In this scenario, the ACL uses an extended access-list with source and destination IPs and protocol/port matching, which is typical for filtering specific application traffic like HTTPS (TCP/443).
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.
Business Continuity, DR & Incident Response — This question tests Business Continuity, DR & Incident Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: HTTPS traffic from 10.0.1.0/24 to 192.168.2.100 is permitted; all other HTTPS is denied — The ACL explicitly permits HTTPS (TCP port 443) traffic from source network 10.0.1.0/24 to destination host 192.168.2.100. Since ACLs have an implicit deny all at the end, any HTTPS traffic not matching this permit statement is denied. Option C correctly states that only this specific traffic is permitted and all other HTTPS is denied.
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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