Network security means the network system hardware, software and its system data are protected, not by accidental or malicious reasons, damaged, changed and disclosed; with continuous and reliable system operation and not interrupted network service.

Preface

With the Internet as the representative of the global information technology is becoming more and more profound, the application of information network technology is becoming more and more popular and widely used. At the same time, the strong cyclone of Internet also at amazing speed penetrates all aspects of the enterprise. Now, large enterprises have already used the existing network technology to build their own network carrier, including sales, promotion, service, ARP, ERP, etc., providing strong support to the development of enterprises.
The network information an enterprise engages has direct relation to the company’s development, while the company involves business secret and network transactions which once disclosed, its image and reputation will be directly influenced. So in order to protect network security, a design for network security is required.

The Factors Influencing the Network Security

Nowadays, the threats existing to enterprise network information security are mainly manifested in the following aspects.
1. Non authorized access. It refers to the non-normal use or unauthorized use of network equipment and information resources.
2. Posing as legitimate users. It mainly refers to the use of a variety of fake or deceptive means to get illegal access to legitimate users, in order to achieve occupancy of legitimate users’ resources.
3. Destruction of data integrity. It refers to the use of illegal means to delete, modify and resend some important information so as to interfere with the user’s normal use.
4. Interference to system normal operation. It means to change the normal operation of the system, and slow down the system’s response time, etc.
5. Viruses and malicious attacks. It refers to the spread of virus or malicious Java, XActive, etc. via network.
6. Line tapping. It refers to the use of electromagnetic leakage of communication medium or wiretapping and other illegal means to obtain information.

Security Gap

Security policies are often contradictory to the user’s convenience, which generates the opposite pressure, resulting that security measures is disjointed with security strategy. This is called a security gap. Why is there a security gap? There are four factors:
1. A wide range of network devices – the network devices currently used are various, from Windows NT and UNIX server to firewall, router and Web server, and each device has its unique security status and security function;
2. The diversification of access mode – generally speaking, your network environment has several ways for login and logout, and some process dial entry point and new Internet access methods may make the establishment of the security strategy complex;
3. The continuous change of network – the network is not static, but keeps developing and changing. While enabling new hardware and operating system, and implementing new application and Web server, the security configuration can be different.
4. The lack of professional knowledge of the security of the user – many organizations have very limit professional knowledge of network security, which is actually the most important cause of the security gap.

Network Security Assessment

To fill the gap between security strategy and security measures, we must evaluate the network security situation from the following three aspects:
1. Assessment from the outside of the enterprise: review the firewall of enterprise computer infrastructure;
2. Assessment from the inside of the enterprise: review the computers in internal network system;
3. Assessment from the system application: review the operating system running on each of the hardware equipment.

Internet Protocol Security (IPSecurity)

As a long-term direction of the security network, IPSec is a suite of protection services and security protocols based on cryptography. Because it does not need to change the application or protocol, you can easily deploy the existing network IPSec. IPSec provides VPN connection using the L2TP protocol with machine level authentication and data encryption. Prior to the establishment of a L2TP connection to protect passwords and data, IPSec is negotiated between a computer and a remote tunnel service.


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