The application and development of computer technology have driven and promoted the change of information technology. The computer and information technology have a wide range of penetration and affinity, which influences the world economy and social development in all aspects. In twenty-first Century, the human life will be more closely linked to the Internet, and more closely related, such as electronic commerce, information platform, etc. However, all kinds of problems arise, for example, there are many threats and attacks existing in the Internet, making the network security damaged, which can cause the disclosure of information, and the system platform and the network resources are under attack. In consequence, in terms of how to ensure the information is sent and received truly, completely, effectively and legally, the issue of network security has become a current research hot-spot. This paper, in allusion to this problem, introduces and analyzes several typical computer network security technologies, including firewall technology, virus protection technology, and virtual private network technology, also called VPN technology.

Abstract. Under the background of the development of computer technology and information technology, the smart home network has been gradually improved, surpassed the previous development, and gained new progress. The realization of smart home system needs network security technology as a guarantee. Although the smart home system has made progress, while for maintaining the harmony and coordination of the families' facilities and the residential environment, there are a lot of technical problems needed to be solved at present. For example, many safety standards need to be unified. This paper, from the realization of the domestic and international research situation of smart home, an overview of the network security technology, smart home network framework, and the existing smart home network security system to study on the application and research of network security technology in smart home, and then analyzes and draws the conclusion. In a word, to achieve the security of smart home system needs network security technology continuing to progress, so it also requires long-term efforts.