CV0-004 Security Practice Question
A cloud administrator is configuring network ACLs (NACLs) for a VPC subnet. The subnet hosts a web server that must accept HTTP (port 80) and HTTPS (port 443) from the internet, and the server needs to respond to clients. Which TWO rules are required?
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
✓
Outbound rule: allow TCP ports 1024-65535 to 0.0.0.0/0
NACLs are stateless, so both inbound and outbound rules must be explicitly allowed. Inbound allows HTTP/HTTPS, outbound allows ephemeral ports for return traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Inbound rule: allow all ICMP from 0.0.0.0/0
Why it's wrong here
ICMP is not required for HTTP/HTTPS.
- ✗
Outbound rule: allow TCP port 80 and 443 to 0.0.0.0/0
Why it's wrong here
Outbound HTTP/HTTPS would be for outbound requests, not responses.
- ✗
Inbound rule: allow TCP ports 1024-65535 from 0.0.0.0/0
Why it's wrong here
Inbound ephemeral ports are not needed for web server.
- ✓
Outbound rule: allow TCP ports 1024-65535 to 0.0.0.0/0
Why this is correct
Allows return traffic on ephemeral ports.
- ✓
Inbound rule: allow TCP port 80 and 443 from 0.0.0.0/0
Why this is correct
Allows incoming web traffic.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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