What Is Firewall And How Does It Work In A Cisco Device? How It Can Be Enabled?

A firewall is a software that is designed in such a manner that it prevents unwarranted access either to or from a network that is private. They can be easily implemented in either software or in hardware and sometimes are implemented in a combination of the two. All private messages in a certain intranet must go through a firewall. In turn the firewall filters the message and will block alls those messages that fail to meet the security criteria.

A firewall in a Cisco device basically combines the already existing the Context-based Access Control (CBAC) feature with the Cisco IOS firewall technology.  So therefore whenever you configure any Cisco Firewall in your Cisco router, you are effectively transforming your router into a robust firewall.

The features of the Cisco firewall are designed specifically to prohibit all unauthorized external persons from getting access to an internal network and to stem all attacks on the network; at the same time it allows all the authorized users to fully access the network resources.

A firewall is a group of connected programs, situated at a network gateway server. Its function is to prevent the users of other networks from gaining access to the files of the private network.  An organisation having an intranet which permits the employees to obtain access to the internet generally sets up a firewall to stop outsiders from gaining access to its private database and company information.

In essence, a firewall works in close relation with a router program, inspects every network pack to decide whether to allow it to go to its final destination.  A firewall also consists of or works with proxy server which asks for permission on behalf of the user. For more information of firewall and its working in devices like Cisco, visit the following link - www.secmanager.com.