Research on firewall technology and its application in computer network security strategy Peihong Wang

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of allowing or denying access, which largely improves the 
security level of computer networks and avoids or reduces the 
losses brought to users by data and information leakage. 
3. Firewall technology 
Firewall is a control device for two different networks to 
realize mutual access, and it is an important security device 
for network security to realize access control of private 
network and public network according to the artificially 
formulated control policy. The main role of firewall is to 
shield the internal information, structure and operation of the 
protected network, and to monitor and restrict the data flow 
across the network. Firewall technology is an applied security 
technology based on modern communication network 
technology and information security technology, which is the 
most recognized and widely used in the current network 
security field. As shown in Figure 1 
Figure 1. Diagram of the location of the firewall in the network 
3.1. The main functions of firewall 
The technology of firewall is very mature, and there are 
many kinds of products, but the role is basically the same. The 
overall function is to achieve isolation and security control 
between two connected networks, and the main functions are 
six points. 

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