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

AAll outbound traffic is denied by default

BOutbound traffic is allowed only on port 80

CAll outbound traffic is allowed by default

DOutbound traffic is allowed only to the same security group

Step-by-Step Solution

Solution:

Step 1: Recall security group rule evaluation
Security groups deny all traffic by default unless explicitly allowed by a rule.
Step 2: Understand effect of no outbound rules
If no outbound rules exist, outbound traffic is allowed by default.
Final Answer:
All outbound traffic is allowed by default -> Option C
Quick Check:
No outbound rules means allow outbound = B [OK]

Quick Trick: No outbound rules means allow outbound traffic [OK]

Common Mistakes:

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