Ravi Sir's Cards › AWS
ping vs nc
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
Network
ping
Checks the host (ICMP).
nc
Checks a TCP port.
Key points
Can be blocked by firewall.
Tests the real service.
Example
ping -c 3 web1
Use when
Is the box up?
Is the app reachable?