how to create a secure network

How do I transform a network to a secure network? What tools should I have and what kind of hardware do I need to have a basic secure network?

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... Ethernet LAN network is ethernet cards for all the computers, ethernet cables and a hub.
<br>Now you need different servers to be running on one of the machines on the network for facilitating the computers to communicate with each other. These servers are software programs such as DNS server etc. Some other servers may be needed as per the requirements, say if ...