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Hi Amal,
Companies in any industry need them, so do the household computers. These people make sure that your computer hardware works fine and is connected to the larger network. They are called system administrators.
With usage of computers in every field, this profile is much in demand. Career in hardware and networking is mainly for the people in Information Technology sector. Proper management and implementation of hardware and networking is one of the premiere needs for success in Information Technology.
Networking involves the practice of linking a group of two or more computer systems for sharing data and information. The professionals associated with the discipline of research of computer hardware and developments of computer network are known as hardware and networking engineers. They also design and supervise the process of manufacturing and installation of hardware.
You can refer the link for list of colleges:
https://it.shiksha.com/hardware-and-networking-courses-in-india-categorypage-10-112-1-0-0-1-1-2-0-none-1-0?
https://www.shiksha.com/hardware-and-networking-article-4582-1
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Wish You Luck!