ISC2 CC Business Continuity, DR & Incident Response Practice Question
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?
⚠ Common exam trap
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.
Answer choices
Why each option matters
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.
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.
- ✗
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.
Visual reference
Go deeper
Related to this question
Learn chapter
Network Security Foundations
Key term
Access Control List
An Access Control List is a set of rules that decides which traffic is allowed or denied entry to a network or device.
Key term
Hypertext Transfer Protocol Secure
Hypertext Transfer Protocol Secure, or HTTPS, is the secure version of HTTP that encrypts data between a web browser and a website using SSL/TLS to protect sensitive information like passwords and credit card numbers.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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