Ravi Sir's Cards › AWS
Security group vs Network ACL
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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What this card says
Works at
Security group
Instance level, stateful.
Network ACL
Subnet level, stateless.
Key points
Allow rules only.
Numbered allow and deny rules.
Example
authorize-security-group-ingress
Use when
Day-to-day access.
Block an IP range.