Telecommunications and Networks

You essay must be about 1500-2000 printed characters.
Write about:
- What is communication and what means of commulication are there?
- What means of transmission are used in telecommunications?
- What is a computer network? What does it consist of? What are the advantages and the disadvantages of computer networks?
- What types of computer networks are there? What are their main features?
- Are you interested in the sphere of telecommunications and networks? Would you like to work in this sphere? What kind of work would you like to do?