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What happens if you do not assign any inbound rules to an AWS security group?

easy📝 Conceptual Q1 of 15
AWS - Security Groups and Network ACLs
What happens if you do not assign any inbound rules to an AWS security group?
AOnly traffic from AWS internal IPs is allowed
BAll inbound traffic is allowed by default
CNo inbound traffic is allowed to the resources associated with the security group
DInbound traffic is allowed only on port 80
Step-by-Step Solution
Solution:
  1. Step 1: Understand default inbound behavior of security groups

    By default, security groups deny all inbound traffic unless explicitly allowed.
  2. Step 2: Analyze the effect of no inbound rules

    With no inbound rules, no inbound traffic can reach the associated resources.
  3. Final Answer:

    No inbound traffic is allowed to the resources associated with the security group -> Option C
  4. Quick Check:

    Default inbound = deny all [OK]
Quick Trick: No inbound rules means no inbound traffic allowed [OK]
Common Mistakes:
  • Assuming inbound traffic is allowed by default
  • Confusing inbound with outbound rules
  • Thinking AWS allows internal traffic automatically

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