Computer network devices also known as communication devices and they constitute a data communication network. These devices are routers, switches, hubs, Network interface cards, gateway, modems and hardware firewall
MODEM
A modem is a communication device that is used to provide the connectivity with the internet. Modem works in two ways modulation and demodulation. It coverts the digital data into the analog and analog to digital
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The central connecting device in a computer network is known as a hub. There are two types of a hub ,active hub and passive hub. Every computer is directly connected with the hub. When data packets arrives at hub, it broadcast them to all the LAN cards in a network and the destined recipient picks them and all other computers discard the data packets. Hub has five, eight, sixteen and more ports and one port is known as uplink port, which is used to connect with the next hub.
Like the router, a switch is an intelligent device that maps the IP address with the MAC address of the LAN card. Unlike the hubs, a switch does not broadcast the data to all the computers, it sends the data packets only to the destined computer. Switches are used in the LAN, MAN and WAN. In an Ethernet network, computers are directly connected with the switch via twisted pair cables. In a network, switches use the three methods to transmit the data i.e. store and forward, cut through and fragment free.
NIC Stands for Network Interface card. It is one of the most important computer network devices that are used for the data communication and to connect the computers with each other. It is plugged inside the computer either in the PCI slot or it is built-in the motherboard.
A server computer is a computer, or series of computers, that link other computers or electronic devices together. They often provide essential services across a network, either to private users inside a large organization or to public users via the internet. For example, when you enter a query in a search engine, the query is sent from your computer over the internet to the servers that store all the relevant web pages. The results are sent back by the server to your computer.
Many servers have dedicated functionality such as web servers, print servers, and database servers. Enterprise
