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If a security group has no outbound rules, what is the default behavior for outbound traffic?

medium📝 Predict Output Q5 of 15
AWS - Security Groups and Network ACLs
If a security group has no outbound rules, what is the default behavior for outbound traffic?
AAll outbound traffic is denied by default
BAll outbound traffic is allowed by default
COutbound traffic is allowed only on port 80
DOutbound traffic is allowed only to instances in the same security group
Step-by-Step Solution
Solution:
  1. Step 1: Recall AWS security group defaults

    By default, if no outbound rules exist, all outbound traffic is allowed.
  2. Step 2: Confirm default allow behavior

    Outbound traffic is allowed by default unless explicitly denied by rules.
  3. Final Answer:

    All outbound traffic is allowed by default -> Option B
  4. Quick Check:

    No outbound rules = allow all outbound [OK]
Quick Trick: No outbound rules means allow all outbound traffic [OK]
Common Mistakes:
  • Assuming outbound denied by default
  • Confusing inbound and outbound defaults

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