AWS - Security Groups and Network ACLs
If a NACL has an outbound rule allowing TCP port 80 but no inbound rule for port 80, what happens to HTTP requests initiated from outside?
If a NACL has an outbound rule allowing TCP port 80 but no inbound rule for port 80, what happens to HTTP requests initiated from outside?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Check inbound rules for port 80
No inbound rule exists for port 80, so inbound HTTP requests are blocked.Step 2: Understand outbound rule role
Outbound rule allowing port 80 does not affect inbound traffic filtering.Final Answer:
HTTP requests are blocked inbound due to missing inbound rule. -> Option DQuick Check:
Inbound rule missing = inbound traffic blocked [OK]
Quick Trick: Inbound traffic needs inbound rule, outbound rule irrelevant [OK]
Common Mistakes:
MISTAKES- Assuming outbound rule allows inbound traffic
- Confusing direction of rules
- Ignoring stateless filtering
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