Students often ask what a network really is. In this guide, Kunal explains that a network is a system of connected devices—from laptops to phones—sharing data. He walks through the core hardware: the modem that brings internet in, the router that distributes it, and the switch that directs local traffic.

Beyond wired and wireless links, the hub acts like a loudspeaker, broadcasting data to all ports, while the switch behaves like a post office, forwarding packets only to their MAC‑addressed destination. A firewall sits between the internet and devices, filtering traffic to keep networks safe for every user session daily.

Finally, Kunal ties the pieces together with a diagram: ISP → modem → router → switch → firewall → load balancer → servers. The load balancer splits incoming requests across multiple servers, preventing overload and ensuring that a sudden spike in traffic doesn’t bring the system to a halt today.