Question

Propose a possible design for a connection to the internet for a small business with 3 departments. Assume the following:

There will be a gateway/router that is the internet connection. There will also be a web server, a mail server and a name server. From this collection of machines there must be connections to three departments. Assume that there are 3 users in each of the three departments and make the departments be payroll, sales and management.

Suggest where a firewall or firewalls should go or what will be in the DMZ.

Mention a list of software that should be running.

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First of all, it must be said there is more than one solution for the network design. In the below paragraphs it will be described a regular approach that can be implemented for achieving a multilayered security of the entire network.
Behind the gateway router it must be setup a firewall (this assuming that router does not have embedded firewall module)....

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