Teaching on the Reform of the computer network

Abstract: In recent years, the rapid development of Computer networks, network Technology, continuously updated, teaching courses on Computer networks also put forward higher requirements. This paper discusses the new situation, the Computer network teaching content and teaching methods of improvement measures, and proved in practice, teaching the feasibility of improvements.

Keywords: network courses; teaching content, teaching methods
With the Computer network to the community more and more far-reaching impact of information Technology, more and more knowledge of Computer networks for students interested in vocational schools, but the current set up computer networks course is concerned with the emphasis on theory, students and difficult the same time, students learn the knowledge and practical application of the existence of network disconnection, resulting in less and less interest in learning, greatly reduce the effectiveness of teaching. In this paper, the actual situation in vocational schools, the teaching content on the computer network and teaching methods to make some suggestions for improvement for the majority of teachers.

First, the improvement of teaching content
The current vocational school computer network curriculum content compared to previous years, there is greater improvement, removed some practicality is not strong, dry and convoluted theory, increase the introduction of new technologies (such as IPV6 Technology, But I feel not enough, for example most of the material only in some simple experiments to explain the operation of this experimental approach, the lack of correlation technique introduced systematic and coherent, practical knowledge of how to do just described, do not explain why the not commonly used in network management software to use, the knowledge is not too much involved in network security and so on.

1 increase in the actual content of theoretical knowledge related to the operation of many computer networks, course materials, the basic theoretical knowledge about the network was more thorough, but when it comes to skills, theoretical knowledge of their relevant enough to explain thoroughly, resulting in students "know, I wonder why." For example, about the switch and router configuration, the materials just experiment with the materials described on the steps, every step of the configuration commands to write, how to wire, switch or router on the work of principle there is no narrative, students can only follow the steps to copy materials rigidly applied, after experiencing similar problems, will feel unable to start, fail to apply their knowledge of the purpose.

In knowledge about the firewall, the firewall should also increase the access control, about the principle of blocking strategies, to enable students to practice during the relevant time, each of the steps to understand the meaning of the author in the actual teaching, the deletion of the Some aspects of the theoretical principles of computer networks, knowledge, increased knowledge related to the theory of operation described, the students generally indicated that they understand and master skills of great help.

(2) an increase in the introduction of network management software
In the computer network management, in addition to familiar with common network equipment, equipment will be installed, configured, and also required to master the popular network management software, can solve the operation of the network failure occurred during the soft, which requires in textbooks To increase the use of related network management software described below is the author of several popular network management software:
(1 protocol analysis software --- sniffer proSniffer software is a portable network analysis and troubleshooting software applications, whether in a wired network or wireless network, it can give real-time network management network monitoring, packet capture and troubleshooting analysis.

(2 traffic monitoring tool --- MRTGMulti Router Traffic Grapher is an free tool to help monitor the network at a critical moment, or in a network to solve a pressing problem, MRTG will be allowed to immediately see the traffic patterns of many networks, and quickly determine what areas are experiencing the existence of abnormal traffic load.

(3 LAN software --- SKillerSKiller speed to break any ARP is a firewall to limit the flow of goals simple network management software, the gateway for people to check information and local information is correct, whether the agent meets the requirements set The network management software to use is not complicated, the author in teaching with practical examples to explain how to use the network management software to solve common network problems, learning well.

3. To increase knowledge about network security introduction
As the network viruses, Trojan horses rampant, a variety of network security incidents occur frequently in computer network courses introduce the knowledge of network security becomes increasingly important so-called network security, refers to the network system's hardware, software and systems The data is protected, not because of accidental or malicious reasons, suffered damage, and disclosure changes, the system normally continuous and reliable operation of the network service is not interrupted. Network security is its essence on the network information security. Network physical layer security system including security, system level security, network layer security, application layer security, security management, involving a wide range of knowledge. For vocational students, do not need to master the theoretical knowledge of complex network security, just ask them understand the common network information security technologies, including cryptography, authentication, digital signature, firewall, intrusion detection, vulnerability scanning, network security awareness to improve on it.

Second, the improvement of teaching methods
The impact of the traditional teaching methods, many schools in teaching computer network courses Shihai dependent podium, blackboard, teachers, only through the blackboard and the language to describe some of the network works, for some highly abstract concept, difficult for students through the books and a brief description of teachers understanding how abstract concepts become easy to understand, you need to use modern means of improving teaching methods.

1 chapters for integrated teaching
Vocational schools require students to have a strong ability, higher skill requirements for operating the chapter, we may learn the integration mode of teaching, will combine theory and practice of teaching operation. For example, "computer LAN" chapter, the traditional style of teaching is to separate the theoretical part of the operating part of the teaching, the teacher first about the theory of knowledge in the classroom, will be classified as operating some experiments in the laboratory to complete. This approach, although desirable place, but there are also disadvantages, mainly theoretical knowledge more boring, most students hear the drowsy, less effective teaching, students during practical operation, because the front did not master the theoretical knowledge, resulting in problems when more, errors are more teachers during experimental guidance, exhausted.

The use of integrated teaching, will combine theory and practice, to promote the integration of theoretical knowledge and practice of teaching, training students in school, training school, understand the theoretical knowledge, master skills, to break the boundaries of teachers and students. Teachers among the students , on the student side, greatly stimulate the enthusiasm of student learning, enhance student interest in learning, students learn while training, have a multiplier effect of teaching. Links to free download http://www.hi138.com I have tried to OSI reference model network architecture and TCP / IP protocol of the theoretical knowledge, and twisted-pair production, routers, switches, combining the use of integrated teaching, the school moved to the network room locations, first explain the two-line, the router and switch fabric, so that the students themselves to reach these devices to observe the wiring, together with relevant courseware, to explain how they work. then extended to explain the OSI model, TCP / IP protocol, and then let students build a small LAN, configure the router , the switch by a return visit after school, students reflect this teaching method can not only deepen the understanding of theoretical knowledge, but also to better grasp the practical skills, teaching good effect.

(2) the introduction of problem situations in teaching
The reason why many students are not interested in computer network courses, mainly feel that learning a useless, do not know under what circumstances will need it, according to Educational psychology research, any desire to learn are generated in certain situations, only This issue of the context of teaching it has a strong appeal in order to arouse students' learning needs, and promote the realization of the task of teaching the teacher during the process of teaching computer network courses, have a sense of the introduction of the current network to use some of the problems encountered in and guide students to use what they have learned to solve problems, develop creative thinking skills, for example, in explaining the IP address, domain name, DNS this part, he put forward a real network environment frequently encountered problems: computer tips "the system detects IP Address xxx.xxx.xxx.xxx and network hardware address 00 05 3B 0C 12 B7 address conflict, network operation of this system may suddenly interrupted, "and then dropped a minute or so and restore the network connection. with this problem, organize students to discuss and put forward solutions can also be set in the experimental problem, and guide students through the experiment to observe, analyze, to think and solve problems, to understand the abstract principles of computer networks. able to do so, teachers can also ask the school network administrator to the students, about the common network problems and solutions, to improve student interest in learning.

3 software using virtual machines and virtual teaching
Computer network is a very practical course, very demanding on the hardware, networking, router, switch, firewall configuration experiment is the basis of experimental computer network courses, but to build a professional network engineering lab, configure the professional routers, switches, and firewalls need a lot of financial support for most vocational schools are a lot of investment coupled with the majority of the school's laboratory for the convenience of management, are installed to protect the hard disk to restore the card or restore the software, students do experiments to bring a lot of restrictions.

In order to solve these problems, a more elegant solution is to install a virtual machine on a stand-alone software, to build a real network environment with the same virtual network teaching, experimental platform on a single physical computer by installing multiple virtual machines to simulate the real network environment, all operations can be this independent, stand-alone system without an Internet connection to achieve, and these operations can be in the multimedia classroom projection screen to show out, effectively improving the effectiveness of teaching computer network courses .

Currently, courses in computer network software is commonly used in virtual VMware Work-Station, teachers can use VMware Workstation for students to quickly create virtual machines, resulting in secure, isolated virtual machines to provide all the required courses, applications and tools. After each class, the virtual machine can be automatically restored to a "clean" state for the next group of students. In the virtual machine can be set up LAN, Active Directory installation and configuration, DNS installation and configuration, Web server configuration, FTP server configuration, mail server configuration so experiment.

In addition, Boson NetSim network simulation software in teaching is also more common, Boson NetSim is an excellent performance with a powerful network simulator, to define their own network equipment and network topology, you can simulate a variety of network needs experimental environment can be static routing, dynamic routing configuration, VLAN and other content into the experiment, simulation, user interface operations people have a real sense of the router.

Computer network is a very practical course, the author of its teaching content and teaching methods in-depth analysis, improvement programs, and through classroom practice proved that the new teaching program to improve student interest in learning, the effectiveness of skills the hope of the majority of the computer network of professional teachers help.

References:
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