Q.Write down the names of few commonly used networking devices.

This is a plain theory question — it asks for a list with brief explanation.

A networking device is any hardware that connects computers, controls traffic, or translates data between different network segments. For Class 12, the devices you must know are:

Hub — A simple device that broadcasts every incoming data packet to all ports. It works at the physical layer and does not filter traffic, so it is inefficient but cheap.

Switch — Smarter than a hub. It reads the MAC address in each packet and forwards it only to the specific destination port. Works at the data-link layer and reduces unnecessary traffic.

Router — Connects two or more different networks (e.g., a home LAN to the Internet). It uses IP addresses to decide the best path for data. Works at the network layer.

Modem — Modulates and demodulates signals so digital data from a computer can travel over analog lines (telephone, cable, fibre). It is the bridge between your local network and your ISP.

Gateway — A device that translates between two completely different network protocols or architectures (e.g., connecting a LAN to a mainframe). Often a router configured to do protocol conversion. …

Why This Question Matters

Before listing names, understand why we need dedicated networking devices at all. A simple cable connecting two computers works, but as soon as you have more than a handful of machines, or need to send data across a building or a city, you need devices that can:

• Amplify signals so they travel farther
• Filter traffic so only the right machine gets the data
• Route data across different networks
• Connect different types of media (copper, fibre, wireless)

Each device solves one or more of these problems. The names you learn are the tools in a network engineer's toolbox.

Commonly Used Networking Devices

Here are the essential ones, grouped by what they do:

1. Hub

A basic device that connects multiple computers in a star topology. When a hub receives data from one port, it blindly broadcasts it to all other ports. No intelligence — every machine sees every packet, which wastes bandwidth and creates security risks. Rarely used today except in very small, low-cost setups.

2. Switch

The smarter replacement for a hub. A switch learns which MAC address is connected to which port, and forwards data only to the specific port that needs it. This cuts down unnecessary traffic dramatically. Switches operate at Layer 2 (Data Link layer) of the OSI model.

3. Router

The device that connects different networks together — for example, your home LAN to the internet. A router reads the destination IP address in a packet and decides the best path to forward it. Routers operate at Layer 3 (Network layer). They also perform Network Address Translation (NAT), which lets many devices share a single public IP.

4. Modem

Short for Modulator-Demodulator. It converts digital signals from your computer into analogue signals that can travel over telephone or cable lines, and vice versa. Without a modem, you cannot connect to an ISP over traditional copper lines. Modern fibre connections use an Optical Network Terminal (ONT) instead, but the concept is the same.

5. Access Point (AP)

A device that allows wireless devices (laptops, phones) to connect to a wired network using Wi-Fi. An AP is not a router — it simply bridges wireless traffic onto the wired Ethernet. In home setups, the router and AP are often combined into a single box.

6. Repeater

A simple device that receives a weakening signal, regenerates it, and retransmits it. Used to extend the physical range of a network — for example, in a long corridor where the cable run exceeds 100 metres (the limit for Ethernet without a repeater).

7. Bridge …