A firewall is an integrated collection of security measures designed to prevent unauthorized electronic access to a networked computer system. It is also a device or set of devices configured to permit, deny, encrypt, decrypt, or proxy all computer traffic between different security domains based upon a set of rules and other criteria.
Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.
There are several types of firewall techniques:
Sonic WALL internet security appliances eliminate the cost and complexity of using separate devices and software packages for comprehensive and effective security. The SonicWALL ® TZ Series is the ideal total security platform for home, small and remote/branch offices, providing a compelling blend of ease-of-use for basic networks and unsurpassed flexibility for more complex networks.
Malicious attacks can penetrate outdated stateful packet inspection firewalls. The TZ Series integrates a deep packet inspection firewall, 802.11b/g secure wireless, gateway anti-virus, anti-spyware, intrusion prevention, content filtering, failover/failback technologies and IPSec VPN capabilities into a cost-effective solution, and scales to protect your investment as your organization grows. Available in multiple hardware and node configurations including the SonicWALL TZ 150, TZ 180 and TZ 190, the TZ Series is ideal for small businesses, remote and branch offices and retail/point-of-sale deployments.
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