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A firewall is a part of a system or network that is designed to block unauthorized access while allowing authorized communications. It is a device or set of devices configured to permit, restrict, encrypt, decrypt, traffic between different areas on the basis of a set of standards and other criteria.
A properly configured firewall adds a necessary protection to the network, but in no case be considered sufficient. The security includes more fields and levels of employment and protection.
The limitations arising from the same definition of firewall: filter traffic. Any type of computer attack that is accepted by the firewall traffic (TCP ports open expressly for use, for example) or simply not use the network, continue to pose a threat. The following list shows some of these risks:
- A firewall can not protect against attacks in traffic that passes through it.
- The firewall can not protect from the threats they are subjected to internal attacks or careless users. The firewall can not prohibit copying sensitive data in corporate spies physical storage media (disks, memories, etc.). I removed the building.
- The firewall can not protect against social engineering attacks.
- The firewall can not protect against possible attacks on the internal network to viruses through files and software. The real solution is that the organization should be aware when installing antivirus software on each machine to protect themselves from viruses that arrive to any storage medium or another source.
The firewall does not protect from bugs services and protocols that traffic is allowed. You must properly configure the security and care services that are published on the Internet.
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