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What is a Firewall?
What is a Firewall?
A firewall can be hardware or software but its main aim is to monitor the traffic on a network, both inbound/outbound and only allow certain traffic.
These are not designed to stop viruses, anti virus software is the main defence here .
They are a primary method to secure against hackers gaining unauthorised access to systems/files.
How do they do this?
How do they do this?
Firewalls achieve this by:
Filtering out particular websites/IP Addresses
Monitoring the packets of information that are sent across the network
Opening/Closing Particular Network Ports
Offering Port forwarding ( where network traffic is sent to a particular machine)
Sample Router Firewall
Sample Router Firewall
This image shows some of the options available on a firewall setup page.
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