Abstract. In computer science, the computer network is a lot of curriculum courses, many university computer professional, as a professional required courses, but also is the computer examination for graduate courses in compulsory subjects, in the modern information society of vary from minute to minute, We should improve the students' practice ability, to cultivate students' theoretical knowledge into practical application, but the traditional teaching methods cannot meet the needs of teaching situation of computer network, the paper proposes several new teaching method , such as case teaching method, questioning teaching method, discussion teaching method, These methods are applied to the complicated knowledge points in the computer network, has obtained the good teaching effect.

A mobile ad-hoc network (MANET) is made up of a group of mobile wireless nodes, which can be flexibly and quickly applied to many applications. The devices in MANET are often suffering from the issue of battery power since they cannot be charged in time. Then, as benefitting from the fact that the fewer nodes provide data forwarding support and the less energy will be consumed, many methods utilize the connecting dominate set (CDS) to prolong the network lifetime. However, constructing a smallest size of CDS is a NP-complete problem. In this paper, we propose a new greedy approach constructing a weighted CDS (Cgreedy-wMCDS) by integrating three factors such as energy, mobility and degree of nodes. The proposed method provides the whole network control and data forwarding support. This new method incorporats route stability into the routing algorithm to reduce the route path failures. The simulation results show that the approach of Cgreedy-wMCDS is superior to other methods in terms of prolonging the lifetime of MANET. The time complexity of our algorithm is ( O D), where D is the network diameter.