Monday, 2 November 2009

Network Security Part 4 Firewall.


A firewall is 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.

A firewall is a dedicated appliance, or software running on another computer, which inspects network traffic passing through it, and denies or permits passage based on a set of rules.

A firewall's basic task is to regulate some of the flow of traffic between computer networks of different trust levels.

Cisco PIX 535 Firewall:

The Cisco PIX 535 Firewall that is used in many companies, delivers enterprise-class security for enterprise and service provider networks in a high performance, purpose-built security appliance. Its highly modular three-rack unit (3RU) design supports up to ten 10/100 Fast Ethernet interfaces or nine Gigabit Ethernet interfaces as well as redundant power supplies, making it an ideal choice for businesses requiring the highest levels of performance, port density, reliability, and investment protection.

Cisco PIX (Private Internet eXchange) is a popular IP firewall and network address translation (NAT) appliance. It was one of the first products in this market segment.

Bluecoat Pix 535 Firewall.

The Cisco Secure PIX Firewall 535 delivers carrier-class performance that meets the needs of large enterprise networks as well as service providers. As part of the world-leading Cisco Secure PIX Firewall series, it provides today's networking customers with unmatched security, reliability, and performance. The PIX 535 integrates stateful firewall and IP Security (IPsec) virtual private network (VPN) functionality with Gigabit Ethernet throughput.??The PIX 535 is a purpose-built firewall appliance that offers an unprecedented level of protection. This is tightly integrated with the PIX Operating System (OS), which is a proprietary, hardened system that eliminates security holes and performance degrading overhead. At the heart of this system is a protection scheme based on the Adaptive Security Algorithm (ASA), which offers stateful connection-oriented firewalling that is capable of 500, 000 concurrent connections while at the same time blocking common denial of service (Dos) attacks.

PIX Firewall Scenario diagram.

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