Learning Basics of networking
Basics of Networking
SSH explained
ssh is a secure way to connect to a machine
Logic A 2 layer key is setup , a public and private key you
Setup Lets say a machine in London wants to talk to a machine in Delhi , london machine is connected to wifi and has a fixed internal IP ( 192.168.1.200 ) , the wifi IP is Dynamic , so in the router’s setting we need to create a port forwarding rule to internal IP (192.168.1.200) on port 22
and on the Delhi machine we need to turn connect using:
ssh -p 2222 your_username@Public_IP : This tells ssh to connect to router’s public IP
Working
TCP explained ( Transmission control protocol )
A protocol to send data over internet its nothing just a reliable method and ensures reliability of data.
Logic and Example
Example: Lets say you want to share 10MB of data from your device on internet The OS just hands over it to networking stack that has TCP built into it
TCP breaks it into smaller chunks called segments. Labeling, each segment gets a unique sequence number IP layer to provide the headers to the data
The Data Link layer (handled by your NIC and drivers) and the Physical layer (your network hardware, e.g., Ethernet, Wi-Fi).
Setup
Working