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Types of Firewall Protection

Firewalls can be a set of devices or related programs or combination of both the hardware and software which check the information passing to and from the Internet or a network. Each ingoing and outgoing communication from the Internet or LAN (local area network) passes through and is examined by the firewall. Any message that does not meet the specified security criteria is blocked by this system. Firewall protection system is designed to prevent unauthorized access to or from Internet or LAN connected to the private network(s) as such access can take advantage of the vulnerabilities in the private network(s). Firewalls effectively protect Intranet, the computer network that uses Internet protocol technology and belongs to a specific organization. Intranet helps securely share communication and information among the employees and work groups and firewalls protect the network from external unauthorized access. [url=http://www.sharktech.net/]Firewall protection[/url] techniques can be of various types such as Network level firewalls, Circuit-level firewalls, Application-level firewalls and more. Network level firewalls, the first generation firewalls examine each packet or piece of message entering or leaving the network and filters traffic based on IP address of the source and the destination, port as well as the service. Packet filtering is fast and transparent and network layer firewalls are currently found as built-in components of most network appliances. The circuit level firewall protection implements security mechanisms when a TCP or UDP connection is established. Technically, it supervises TCP handshaking among packets to confirm that a session is genuine. Application-level firewalls will go much deeper and apply security mechanisms to specific applications and intercept all packets traveling to or from an application.

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