2-What Is Networking .

A Network is collection of  devices and connected with each other to allowing the data to be shared with each other , Any other device capable of connecting to a network is considered as a networking device .

I am listing some common usable networking device below.

1-Computers (exp-Desktop,Laptop,Mainframe or Server)

2-Hub

3-Router

4-Switch

5-Repeater

6-Webcam  etc.

SWITCH:--It's  a very well know device in the networking industry you can see it in each and every where  to build the network  . It uses the hardware address to process and forward the frames 

over the network from source to destination.

ROUTER:-Router is a device to used  to communicate with one network to another . It's a layer 3 

device and it's forward the packet over the network based on the IP address from source to destination.

HUB:--This device was very popular once upon a time ,  But now a days  it's no more used in the network .Because there was having some disadvantages  which was making very trouble to
network due to broadcast.

REPEATER:- It was one of  the  very popular device on earlier days Because this was helping to transmit the signal from one end to another, For example:- if you will talk about the  coaxial cable there was some  specific measure of distance .If you want to extent that distance then you need 

use the repeater the in between the devices .