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Given a NACL with inbound rule allowing TCP port 443 and no outbound rules, what happens to HTTPS response traffic?

medium📝 Predict Output Q4 of 15
AWS - Security Groups and Network ACLs
Given a NACL with inbound rule allowing TCP port 443 and no outbound rules, what happens to HTTPS response traffic?
AResponse traffic is blocked because no outbound rule allows it.
BResponse traffic is allowed automatically by NACL.
CResponse traffic is allowed if security groups allow it.
DResponse traffic is blocked unless inbound rule allows it.
Step-by-Step Solution
Solution:
  1. Step 1: Analyze inbound rule

    Inbound TCP port 443 is allowed, so incoming HTTPS requests pass through.
  2. Step 2: Check outbound rules for response

    No outbound rules exist, so response traffic is blocked by default due to statelessness.
  3. Final Answer:

    Response traffic is blocked because no outbound rule allows it. -> Option A
  4. Quick Check:

    No outbound rule = response blocked [OK]
Quick Trick: No outbound rule means no return traffic allowed [OK]
Common Mistakes:
MISTAKES
  • Assuming return traffic auto-allowed
  • Confusing security group rules with NACL rules
  • Ignoring stateless nature of NACLs

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