Essential Computer Networks interview questions covering TCP 3-way handshake, UDP, flow and congestion control, DNS resolution, HTTP/2 & HTTP/3, TLS handshake, subnetting, and real-time networking protocols.
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A computer network is a collection of interconnected devices (computers, servers, phones, IoT devices) that can exchange data and share resources over wired or wireless links using standard communication protocols. The core benefits are: (1) resource sharing - printers, storage, and internet connections can be shared instead of duplicated per device; (2) communication - email, messaging, and file transfer between users; (3) centralized data management and backup; (4) scalability and cost efficiency, since infrastructure like servers can serve many clients; and (5) enabling distributed applications (e.g., client-server and cloud computing) that would be impossible on isolated machines. In an interview, it helps to mention common network types by scope - PAN, LAN, MAN, WAN - since 'network' spans everything from two laptops connected via Bluetooth to the global internet.
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