OmniSecu.com Logo  
omnisecu.com free mcse ccna rhce linux java learning
omnisecu.com free mcse ccna rhce linux java learning
          Sharefacebook twitter google+ google bookmark yahoo bookmark delicious digg linkedin pinterest reddit stumbleupon evernote diigo blinklist blogmarks livejournal email feed

Tutorials

Network Infrastructure devices - What is a Firewall

External Resources

Firewalls are used to protect a network's data and resources from outside access and threats. A Firewall is used as a barrier between a internal network of an organization and another network (may be public internet or another network of the same organization).

Since the primary function of a Firewall is to protect a network's data and resources from outside threats, they are usually placed at the end point of a network.

A firewall can be a dedicated Hardware device, or Software running in a computer.

Firewalls can be configured with "rules". Firewall rules can be used to allow/deny network traffic from/to the network. These rules can be based on Source/Destination network, Source/Destination IP Address, Source/Destination TCP/UDP port numbers, Protocols, Applications etc.

Following image shows a Cisco ASA 5520 firewall device.

Cisco ASA 5520

 

              Jajish Thomason Google+
Related Topics
Why we need computer networks? Network Topologies - Bus Topology Network Topologies - Star Topology Why we need computer networks?
comments powered by Disqus


eXTReMe Tracker DMCA.com