Download free Firewall Tutorial course material, tutorial training, PDF file by Cisco Systems on 21 pages.
An area to protect: a local network .
A business network / staff to be protected
Overlooked a network 'external' to or intruders are suceptibles conduct to attacks.
2) A firewall
Installed in a compulsory passage point between the network to be protected (internal) and a non-secure network (external).
It's a different set of hardware and software components that control the traffic inside / outside according to a security policy.
The firewall has quite often a single software, but you can also have a complex with multiple filters, multiple gateways, several sub networks ....
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