What's the role of firewalls?

A, what is a firewall?

The so-called firewall refers to a combination of software and hardware devices, between the internal and external network, private network A protective barrier constructed on the interface of a public network. is a way to get the security of the image, it is a combination of computer hardware and software, so that the Internet and the intranet to establish a security gateway between the In order to protect the intranet from the intrusion of illegal users, the firewall consists of 4 parts of service access rules, verification tools, packet filtering and application gateways, which is a software or hardware between the computer and the network to which it is connected. All network traffic and packets flowing out of this computer are passed through this firewall.

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Second, the role of the firewall

After the introduction of a small series of firewalls, I believe that some of the role of the firewall we have some understanding of it, then there are some other role, the following is to see the small series for everyone to organize out:

1, the network security barrier

Firewall can greatly improve the security of the computer network, filtering some unsafe factors, so as to improve the security of the computer. Firewalls can block some software that does not pass the application protocol, so the network environment becomes more secure.

2. Strengthen network security Strategy

Through the firewall-centric security scheme configuration, all security software (such as password, encryption, identity authentication, audit, etc.) can be configured on the fire wall. Compared with the problem of network security, the centralized security management of firewall is more economical. For example, in the network access, once a secret password system and other identity authentication system can not be spread out on each host, and focus on a firewall.

3. Monitor network access and access

Some of the computer's practical situation will have firewall monitoring, and the firewall will make some log records in time, but also can provide network practical statistics. When found to be able to move, the firewall will be timely alarm processing, and provide some data for analysis. If there is a case of manslaughter, then we can also get back through the firewall in time.

4, place the internal information leakage

Firewalls not only prevent external bad information from flowing in, but also prevent internal important information from being acquired by others. This greatly protects the user's privacy, but we can not be completely relieved, or need to keep in their own personal USB disk or hard drive insurance.