connect networks using router

I’m a network engineer, we have two networks one is a global network and
other is a private network there are lot of workstations in the private
network, but we don’t want to make all the systems visible in the global
network because to minimize the risk of worms and virus attacks. My goal
is to make only one computer visible to both private and global network.
We are trying to accomplish this by keeping files from a private network
open to only one computer in the global network by this we are making a
connection and also reducing the hassles. I want to use a router switch
to connect these two networks how do I do it?


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