Network Security - Firewalls
A firewall
in its most basic terms is a filter. Where-as in reality a firewall is a
structure that prevents a natural disaster fire from spreading. In computing
terms, it would simply filter and prevent malicious or unusual data packets and
activity that flows through the network, either inspecting the packets or
abiding by the rules that have been configured to allow and deny data packets
in and out the network.
Firewalls
come in both hardware devices and software utilities, there are also different
types of firewalls that work at different layers of the OSI Model and require
different policies therefore using different inspection techniques and
achieving different results for different purposes.
It’s
important to monitor and analyse the flow control of the packets on the network
and set rules to allow or block specific data packets that can help protect a
network against malicious attacks, there are specialised hardware, software and
firmware equipment that can be used to countermeasure and reduce risk against
malicious attacks. The specialised equipment that can help reduce risk are:
·
Firewalls
·
Intrusion
detection and prevention systems (also contains a firewall)
·
Honeypots
·
Access Control
List (ACL)
·
Demilitarized
Zone (DMZ)
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