Introduction to various types of firewalls (1)

Information security has always been a key topic in computer application. Today, with the increasing expansion and popularization of computer network, the demand for information security of computers is higher and the coverage is wider.

The main research of computer information security is the prevention and control of virus and the security of the system. Not only requires the prevention of viruses, but also to improve the system to resist the ability of foreign illegal hackers, but also to improve the confidentiality of remote data transmission, to avoid illegal theft in transit.

In the prevention of network viruses, the main prevention in the download executable software such as: *.exe, *.zip, and other documents, the virus latent and replication transmission.

For the system itself security, mainly consider the stability of the server itself, health-like, enhance their own resistance, to eliminate all possible hacker intrusion channels, to avoid the threat of the system. For important business applications, firewalls and data encryption techniques must be added to protect them.

In data encryption, it is more important to continuously improve and improve data encryption technology, so that has evil intentions people in the network difficult to have an opportunity.

The computer information security is a very big research category, this article mainly discusses to protect the network information security, as the firewall user how to evaluate own business demand, how to through the product comparison selection, chooses the appropriate own firewall product.

As we all know, the main means to protect the information security of computer systems is to deploy and apply firewalls. However, we encounter many problems when using firewalls, the most representative of the following three:

First, firewall is a hardware firewall, or a software firewall? This is difficult for many people to determine. Hard, software firewall, each has its own advantages, but who has a greater advantage, as a common user, it is difficult to understand deeply.

Secondly, how to choose the firewall? There are so many kinds of firewall products, and the technical level of each firewall manufacturer is uneven, which is the choice? You know, if you choose the wrong product, the return on investment is trivial, if the system is attacked, leading to the disclosure of important information or damage, the user's loss is big.

Third, if the selection of a software firewall, it and the user's current operating system compatibility, there is no integration advantages? This is also a problem that firewall users often ask.

The following is a list of some of the main firewall products, from their respective characteristics, functions, processing performance and operational complexity and other aspects of the comparison, and the actual use of some of the problems encountered in the proposed for everyone to learn from.

1. Cisco PIX

CISCO Pix is the most representative hardware firewall, belongs to the state detection type. Because it employs its own real-time embedded operating system, it reduces the likelihood of hackers exploiting operating system bug attacks. In terms of performance, Cisco Pix is the best of its kind of hardware firewall products, with a 100BaseT speed. Therefore, for high data traffic requirements of the occasion, such as large ISPs, should be preferred.

However, its advantages in front of the software firewall will not appear less obvious. Its fatal wound mainly has three: one price is expensive, the second escalation difficulty, its three management cumbersome complex.