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Why must Network ACLs have both inbound and outbound rules configured to allow traffic?

hard📝 Conceptual Q10 of 15
AWS - Security Groups and Network ACLs
Why must Network ACLs have both inbound and outbound rules configured to allow traffic?
ABecause outbound rules override inbound rules.
BBecause Network ACLs are stateless and require explicit rules for both directions.
CBecause Network ACLs automatically allow return traffic.
DBecause inbound rules apply only to private IPs.
Step-by-Step Solution
Solution:

  1. Step 1: Understand stateless nature of Network ACLs

    Network ACLs do not track connection state, so return traffic must be explicitly allowed.

  2. Step 2: Explain need for both inbound and outbound rules

    Both directions need rules to allow traffic and its response.

  3. Final Answer:

    Because Network ACLs are stateless and require explicit rules for both directions. -> Option B

  4. Quick Check:

    Stateless means explicit inbound and outbound rules needed [OK]
Quick Trick: Stateless ACLs need rules for both inbound and outbound [OK]
Common Mistakes:
  • Assuming return traffic is automatic
  • Thinking outbound rules override inbound
  • Believing inbound rules only affect private IPs

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