Abstract. Since computer network has become the basis of the information society, network topology has also become an important part of network management. The theory foundation of the network topology algorithm based on SNMP has been introduced in this paper, and the algorithms of network topology discovery based on SNMP have been mainly focused on. The algorithms in the network layer and link layer have been compared and expounded, and then the advantages and disadvantages of them have been summarized in the end.

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Abstract. With the development of trusted computing, trusted computing model and trusted computing platforms are constantly changing, and becoming more and more perfect. In terms of the hardware platform, the trusted computing technology has been gradually matured. Many companies and businesses solve security problems by using trusted technologies. Trusted computing technology focuses on such as hardware, operating system and other aspects, wishing to build a complete, credible and reliable trusted platform. In this paper, the structure of the trusted platform has been described. Focus on Protected Capabilities, Integrity Measurement and Attestation which are the representative characteristics, some analysis and researches have been proposed. And analyze the main parts and priorities of the designing process of trusted platforms.