Chinese name
network technology
Foreign name
network technology
risetime
65438+issued in the mid-1990s.
function
Comprehensive sharing of resources and organic cooperation.
quick
navigate by water/air
The research status of key technologies in the application of specialized courses, the classification and composition of main functions in application fields, the problems faced and the significance of formulating technical definitions.
Development history
The application scope of the Internet expanded from the earliest military and national defense to American academic institutions, and then it quickly covered all fields in the world, and its operational nature gradually shifted from scientific research and education to commercialization.
In scientific research, we often encounter the thing of "as you sow, you reap", and the appearance of the Internet is the same: its prototype is the network established by the Advanced Research Projects Agency of the US Department of Defense for military experiments in 1969, named ARPANET. At the beginning, there were only four hosts, and its design goal was that when part of the network was damaged by war, the rest could still operate normally; In the early 1980s, ARPA and the US Department of Defense Communications Bureau successfully developed the TCP/IP protocol for heterogeneous networks and put it into use. 1986, with the support of the National Science Foundation of the United States, some supercomputers distributed in various places were connected by high-speed communication lines, and ARPANET was replaced by NFSNET; Then after more than ten years of development, the Internet was formed.
In the early 1990s, China joined the Internet as the 7th1th national network, and China has opened the Internet, which can be connected with the Internet through China public Internet (CHINANET) or China Education and Research Computer Network (CERNET). As long as you have a microcomputer, a modem and a domestic direct dial telephone, you can easily enjoy the resources of the Internet. This is also one of the reasons why the Internet has gradually "crawled" into the homes of ordinary people. The second reason is that the friendly user interface, rich information resources and human touch close to life make non-professional family users not only enjoy the application freely, but also feast their eyes on it, and even use it to add icing on the cake to their work, study and life, so as to truly "stay at home, achieve what's going on in the world and be a contemporary".
The magical function of the network attracts more and more users to join it. Because of this, The durability of the network is also facing more and more severe tests-from hardware, software, Standards used in ............................................................................................................................... Today, the Internet can withstand the participation of so many users, which shows that our network technology has developed to a quite mature stage, and users themselves can hear and see new terms and concepts that are constantly emerging. But this is not the end, but the beginning of a new era in the long history.
Professional courses
First stage
course content
1. Computer operation
Office automation
3. Computer English
4. Computer assembly and maintenance
Stage training objectives
Master the basic operation of computer, the use of daily office equipment such as office software, printers and scanners, and the basic knowledge of computer assembly, common troubleshooting and design.
stage Ⅱ
course content
1. Data communication foundation of enterprise network
2. Small and medium-sized enterprise network construction and maintenance
3.3. The main application of Windows server operating system
4.Windows Server Advanced Applications (Active Directory Management, Domain Control Management)
5.AutoCAD engineering drawing
Stage training objectives
1. Be familiar with the establishment and maintenance of enterprise network and master the basic methods of network integrated wiring.
2. Install and maintain the architecture and management of windows server.
Employment direction
Engaged in small and medium-sized enterprise network management and windows server construction, network construction, network operation, network application, etc.
The third stage
Project Practice 1: Design and Optimization of Typical Network Structure Scheme
1.linux system management
2.linux network services
3. Cyber Attack and Defense Foundation
4. Advanced application of network equipment
Project actual combat II: High-end application of enterprise servers and network equipment
Computer programming and website construction.
2. Database Application Foundation (SQL Server)
3. Enterprise network security and management
4. Comprehensive practice of enterprise network security
5. Establishment and maintenance of enterprise mail system (optional)
6. Advanced application of enterprise server (optional)
Project actual combat 3: intelligent application system expansion and deepening and comprehensive practice
Stage training objectives
1. Install and manage various application services in the linux environment; Complete the daily operation and maintenance of enterprise network independently. 2. Be able to skillfully use and debug network equipment, set up a campus network, and quickly troubleshoot network operation.
1. primary database backup and recovery.
2. Master enterprise network security management.
3. Establish and maintain the enterprise mail system.
Employment direction
Engaged in network structure design, network system management, database management, network security management and other positions.
Authoritative certification: professional qualification certificate Xinhua-Microsoft IT assistant engineer CIW information network security CEAC network engineer
training program
Home network project
Office network project
Hospital network engineering
Supermarket network project
Campus network construction project
Application highlights
The Internet is so wonderful that beginners can't help thinking: What can it do for us? Generally speaking, the Internet is a set of applications that accomplish useful communication tasks through the network. The next few pages will show some of the most popular functions of the Internet, including e-mail, WWW, file transfer, remote login, newsgroups, information inquiry, etc.
With the global internet, people first think that they can use it to provide personal communication, which should have the advantages of telephone speed and postal reliability. The idea took root and the final fruit was email. Through it, everyone can have their own private mailbox for storing letters that have been received but have not had time to read. E-mail addresses include user names and host names, separated by an @ sign. For example, from the initial communication between two people to today's mail software, more complex and diverse services can be realized, including: one-to-many sending, forwarding and replying letters, which contain multimedia information such as sounds and images; You can even do that as long as your mail arrives, the BP machine hanging on you will beep and give a prompt; People can also order the information they need online just like newspapers and magazines, and send it to them by email regularly.
World Wide Web
The World Wide Web (commonly called WWW) is often translated into "World Wide Web" in Chinese, which not only has similar pronunciation, but also embodies its ever-changing connotation. With the help of a browser software, users can enter the page address (or domain name) they want to view in the address bar, and then they can connect to the WWW server pointed by the address to find the required graphic information. Visiting WWW feels a bit like visiting a big shopping mall. You can wander aimlessly and move forward with a goal. But in any case, when users finally get what they want, they may have crossed the Qianshan Mountain, so we sometimes call it "surfing the Internet". The page content stored in WWW server is written in HTML (Hypertext Markup Language) and transmitted to users through HTTP protocol.
File transfer
Although e-mail can also transfer files, it is usually used for short message transmission. The Internet provides a file transfer application called FTP (File Transfer Protocol), which enables users to send or receive very large data files. When users send FTP commands and connect to the FTP server, they can enter commands to display the file directory stored in the server, or copy files from the directory and send them to their computers through the network. The FTP server provides a way to verify the user's rights (using user name and password) and restrict the access of unauthorized users. However, in order to expand their influence, many system administrators have opened the settings of anonymous ftp service-anonymous ftp allows users without registered names or passwords to access designated files on the machine, and it uses a special user name of "anonymous".
remote login
Remote login allows users to connect from one machine to another remote machine and establish an interactive login connection. After logging in, every keystroke of the user is transmitted to the remote host, and the characters are sent back to the local machine after being processed by the remote host, which looks like the user is directly operating the remote host. Remote login usually requires a valid login account to accept authentication from other hosts. Commonly used login programs are TELNET, RLOGIN, etc.
Usenet newsgroup
Newsgroup news is a discussion group on the Internet. Newsgroups organize discussions under a group of titles called newsgroups. Users can read news sent by others or publish their own articles. Newsgroups include dozens of categories and thousands of groups of "news", and each group publishes hundreds of "news" on average every day. Newsgroups also participate in a very casual way. You can talk, ask questions or just watch others talk. The above list is only the main content of the Internet cultural corridor, but it is by no means all. The Internet is always developing and bringing forth new ideas, which will be the content of our next article-the development trend of the Internet. Network research originated from the high-performance computing research project funded by the US government in the past decade. The goal of this research is to integrate many trans-regional high-performance computers, large databases, large scientific research equipment, communication equipment, visualization equipment and various sensors into a huge supercomputer system to support scientific calculation and research.
Microsoft will focus on the development of data network, focusing on the use of the network to enjoy information, rather than the computing power of the network, which reflects the differences between academic and research fields. In fact, many network technologies used in academic fields can become commercial applications.
Globus is a network technology research and development project of Argonne National Laboratory in the United States, and two universities and research institutions in the United States 12 participated in the project. Globus studies the key theories of network computing, such as resource management, security, information service and data management, develops network computing tools and software that can run on various platforms, helps to plan and build large-scale network test platforms, and develops large-scale applications suitable for large-scale network systems. Globus technology has been applied in eight projects, including NASA network, European data network and national technology network. In August, 2005, International Business Machines Corporation (IBM) announced that it had invested billions of dollars in research and development of network computing, and cooperated with Globus to develop an open network computing standard, claiming that the value of the network is not limited to scientific computing, but also has a good commercial application prospect. Network computing and Globus have received unprecedented attention from behind the scenes to the foreground.
China attaches great importance to the development of network technology. The National Network Project of China supported by the 863 Program "High Performance Computer and Its Core Software" has made innovative achievements in high performance computer, network software, network environment and application. China National Network, a network test bed with 18 trillion computing power and supporting network research and application, was officially put into operation on February 2, 2005. This means that through network technology, China has been able to effectively integrate the computing resources of large computers across the country and form a powerful computing platform to help scientific research units and scientific and technological workers realize the sharing and cooperation of computing resources and data.
key technology
The key technologies of network include network nodes, broadband network system, resource management and task scheduling tools, and visualization tools of application layer. Network nodes are providers of network computing resources, including high-end servers, cluster systems, MPP system large storage devices, databases and so on. Broadband network system is a necessary means to provide high-performance communication in network computing environment. Resource management and task scheduling tools are used to solve key problems such as resource description, organization and management. The task scheduling tool dynamically schedules tasks in the system according to the current system load, thus improving the operating efficiency of the system. Network computing is mainly scientific computing, often accompanied by massive data. If the calculation results are converted into intuitive graphic information, it can help researchers get rid of the difficulty of understanding the data. This requires the development of visual tools that can be transmitted and read in network computing, and provides a friendly user interface.
research status
Network computing usually focuses on large-scale application projects. According to Globus technology, large-scale application projects should be completed by multiple organizations, which form a "virtual organization", and the computing resources owned by each organization are shared in the virtual organization to complete the project together. For the enjoyment of * * *, what is valuable is not the device itself but the interface or interface of the entity.
From a technical point of view, * * * sharing is the interoperability between resources or entities. The setting of Globus technology and interoperability in the network environment mean that it is necessary to formulate a set of general protocols to describe the message format and the rules of message exchange. On top of the protocol, a series of services need to be developed, which is the same as the principle of World Wide Web services based on TCP/IP (Transmission Control Protocol/Internet Protocol). Define application programming interfaces in services, and then build software development tools based on these interfaces.
Globus network computing protocol is based on Internet protocol, which is based on the functions of communication, routing and name resolution. Globus protocol is divided into five layers: construction layer, connection layer, resource layer, collection layer and application layer. Each layer has its own services, application programming interfaces and software development tools, and the upper protocol calls the services of the lower protocol. All global applications in the network need to call the operating system through the services provided by the protocol.
The function of the structure layer is to provide available resources to * * * in the network, which is a physical or logical entity. Common resources include processing power, storage systems, directories, network resources, distributed file systems, distributed computer pools and computer clusters.