Class 9 Computer — Networking Important Questions with Answers (Long answers)

A school lab LAN uses switches, Ethernet cables or Wi-Fi, and private IP addresses so PCs can share a printer and files. A router connects that LAN to the internet, which is a WAN of many networks. MAN is city-scale. Modem links to the ISP. Fibre and radio are media; bandwidth and latency describe quality. Students should draw a simple diagram: PCs–switch–router–internet. Do not confuse IP address with email address.

In client-server, a central server holds accounts, files or the website; labs are clients. In P2P, PCs share folders as equals — simple but harder to control. Schools prefer server + teacher admin for updates and restrictions. The internet itself is many servers (web, mail) and millions of clients (browsers). Draw both as box diagrams in long answers.

Wi-Fi is wireless LAN using radio, usually through a router. Advantage: mobility, fewer floor cables. Limits: walls, interference, shared bandwidth. Safety: strong password (WPA2/WPA3 as the school sets), no open unknown hotspots for banking, do not share the lab password outside. Wi-Fi is still a LAN technology, not a separate internet of its own.