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Every company has a network whether this is a large network or a small network. In our world today, a business cannot "live" without a network, without the inner world and/or the external world. The internal network includes the connection between computers, printers, scanners, servers, smartphones, as well as the connection between branches/ stores/ buildings/ countries. The external network includes the connection between the business and the world outside – the internet. Without these two types of networks, the business cannot function. What will you do if your computer does not work? What if your computer's connection to the source of information (the server) does not work? What if your connection to the outside world, to the credit card company,