Ravi Sir's Cards › AWS
Lab vs production
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
Lab vs production
SNS email OTP
Free-tier friendly; confirm subscription once.
SNS SMS OTP
Per-message cost; SMS sandbox hurdles.
Key points
Classroom learning of request/verify.
Real phone OTPs after sandbox exit.
Example
Topic emails 6 digits.
Use when
Learn safely.
Real SMS carefully.