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Wednesday, June 2, 2021

Network technology

 Network technology is a new technology developed from the mid-1990s. It integrates the scattered resources on the Internet into an organic whole, realizes the comprehensive sharing and organic cooperation of resources, so that people can use the overall ability of resources transparently and obtain information on demand. Resources include high-performance computer, storage resources, data resources, information resources, knowledge resources, expert resources, large databases, networks, sensors, etc. The current Internet is limited to information sharing, and the network is considered to be the third stage of Internet development. The network can construct regional network, enterprise internal network, local area network, even home network and personal network. The fundamental feature of the network is not necessarily its size.


Chinese name


network technique


Foreign name


network technique


Rise time


Mid-1990s


function


Comprehensive sharing and organic cooperation of resources


fast


Navigation


The research status of key technologies in the application of professional course training project


development history


The application of Internet has been extended from the earliest military and national defense to academic institutions in the United States, and then rapidly covers all fields around the world. The operation nature has gradually shifted from scientific research and education to commercialization.


In scientific research, there are often "seeds and beans" and the emergence of Internet is the same: its prototype is the network established by the advanced research projects agency of the United States Department of defense for military experiments in 1969, called ARPANET, with only four hosts in the initial stage, The design goal is that when some parts of the network are destroyed due to war, the rest can still operate normally; In the early 1980s ARPA and the Department of Defense Communications Bureau developed and put into use tcp/ip protocol for heterogeneous networks; In 1986, with the support of the National Science Foundation of the United States, some supercomputers distributed in different regions were connected with high-speed communication lines, and nfsnet was used to replace ARPANET; Then, after more than ten years of development, Internet has been formed.


In the early 1990s, China joined the Internet as the 71st national network. China has opened the Internet, and can be connected with the Internet through China public Internet (Chinanet) or China Education and research computer network (CERNET). As long as there is a microcomputer, a modem and a domestic direct dial telephone can enjoy the Internet resources conveniently; This is one of the reasons why internet gradually "climbs" into ordinary people; Second, the friendly user interface, rich information resources and close to life make non professional family users not only use freely, but also can enjoy their eyes. Even using it to add to their work, study and life, truly achieve "not enough to leave the house, can achieve the world affairs and be a contemporary person naturally".


The magic effect of network attracts more and more users to join. Therefore, the network bearing capacity is facing more and more severe test - from hardware, software and standards used, all technologies need to be timely responded to the situation and develop accordingly, which is the catalyst for the rapid progress of network. Today, the Internet can afford so many users' participation, which indicates that our network technology has grown to a fairly mature point, and users can also hear and witness the emerging new terms and concepts. But it is not the end, it is only the beginning of a new era of long history.


Professional courses


The first stage


Course content


1. computer operation


Office office automation


3. computer English


4. computer assembly and maintenance


Stage training objectives


Master the basic operation of computer, daily office software, printer, scanner and other daily office equipment, computer assembly, common troubleshooting and design basic knowledge.


Stage II


Course content


1. enterprise network data communication foundation


2. construction and maintenance of small and medium sized enterprise network


3. Primary application of window server operating system


4. Advanced application of window server (active directory management, domain control management)


5. Drawing of AutoCAD drawing


Stage training objectives


1. master the establishment and maintenance of enterprise network and master the basic methods of network comprehensive wiring.


2. install and maintain the architecture and management of windows server.


Employment direction


Engaged in network management of small and medium enterprises, Windows Server building, network building, network operation, network application and other work.


The third stage


Project practice I: design and optimization of typical network structure


1. Linux system management


2. Linux Network Service


3. network attack and Defense Foundation


4. advanced application of network equipment


Project Practice II: high end application of enterprise level servers and network equipment


1. computer programming and website construction


2. database application basis (SQL Server)


3. enterprise network security and management


4. comprehensive practice of enterprise network security


5. establishment and maintenance of enterprise email system (optional)


6. advanced application of enterprise level server (optional)


Project practice 3: the development and comprehensive practice of intelligent application system


Stage training objectives


1. install and manage various application services under linux environment; Independently complete the daily operation and maintenance of enterprise network. 2. be able to skillfully use and debug network equipment to establish park network, and quickly eliminate the network operation fault


1. master the backup and recovery of database


2. master the safety management of enterprise network


3. establish and maintain enterprise email system


Employment direction


Engaged in network structure design, network system management, database management, network security management and other positions


Authority certification: professional qualification certificate Xinhua Microsoft IT Assistant Engineer CIW information network security CEAC Network Engineer


Training program


Home networking project


Office network project


Hospital network project


Supermarket network project


Campus network construction project


Application collection


The Internet is so wonderful that the first entrants wonder: what can it do for us? In general, Internet is a set of applications that can accomplish useful communication tasks through the network. The following sections will start with the application and show several of the most popular functions of the Internet, including: email, WWW, file transmission, remote login, newsgroups, information query, etc.


E-mail


With the Internet reaching the world, people first think that it can be used to provide personal communication, and this communication should have the advantages of telephone speed and post reliability. This idea takes root and sprouts and grows up, and the final fruit is email. Through it, each person can have his own private mailbox to store the received but unreadable mail address including the user name and the host name, and separated by @ sign in the middle. For example, from the communication between the two people, the email software can realize more complex and diverse services, including: one to many letters, The forward and reply of letters include multimedia information such as sound and image in the letter; Even can do as long as you have mail to arrive, the bpmachine hanging on you will beep to send out a prompt; People can also order the information they need online, like ordering newspapers and magazines, and send them to them regularly by email.


WWW


World Wide Web (usually known as WWW) is often translated into "World Wide Web" in Chinese. Besides the similar pronunciation, it also reflects the meaning of thousands of changes. With the help of a browser software, users can connect to the WWW server to which the address points by entering the page address (or domain name) to view in the address bar, and find the required text and text information. The feeling of WWW visit is like shopping malls, which can wander freely and can go forward with a goal; But no matter what, when the user finally gets what they want, it may have crossed the mountains and rivers, so sometimes we call it "web surfing.". The contents of the pages stored by the WWW server are written in HTML language, which is transmitted to users through the HTTP protocol.


file transfer


Although email can also deliver files, it is generally used for SMS delivery. Internet provides a file transfer application called FTP (File Transfer Protocol), which enables users to send or receive very large data files: when users issue FTP command and connect to FTP server, they can enter commands to display the file directory stored by the server, or copy files from a directory and pass them to their computer through the network. FTP server provides a method to verify user rights (using user name and password), which limits the access of unauthorized users. However, many system administrators open anonymous FTP service settings to expand the impact - anonymous FTP allows users without a registered name or password to access the specified file on the machine, and the special user name used is "anonymous mous".


Remote login


Remote login allows users to connect from one machine to another remote machine and to establish an interactive login connection. After login, each keystroke of the user is passed to the remote host. After being processed by the remote host, the characters are returned to the local machine, which seems as if the user is directly operating on the remote host. Remote login usually requires a valid login account to accept the authentication of the host. The common login programs are Telnet, rlogin, etc.


Usenet news group


Usenet news is a discussion group on the Internet. Usenet organizes discussions under a set of titles called newsgroups, where users can read news sent by others or publish their own articles. The news group includes dozens of categories and thousands of "news groups", and on average, hundreds of "news" are published every day. The way the newsgroup gets involved is also very casual, and you can talk about it, ask questions, or just watch people talk about it. The above list is only the main content of Internet culture corridor, but not all. The Internet is always developing and bringing forth new ideas. This will be the development trend of Internet, the content of our next article. Network research originated from the high performance computing research project funded by the U.S. government in the past ten years. The aim of this study is to integrate multiple high-performance computers, large databases, large scientific research equipment, communication equipment, visualization equipment and various sensors across regions into a huge supercomputer system to support scientific calculation and scientific research.


Microsoft focuses on data networks, focusing on the use of network sharing information, rather than computing power, which reflects differences in 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, which is participated by 12 universities and research institutions in the United States. 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 network test platforms and develop large applications suitable for large network system operation. Globus technology has been applied in 8 projects, such as NASA network, European data network, national technology network of the United States, etc. In August, 2005, IBM announced that it invested billions of dollars in research and development of network computing, and cooperated with globus to develop open network computing standards. It also claimed that the value of network is not limited to scientific computing, but also has a good prospect for commercial application. Network computing and globus have been paid more attention from behind the scenes to the front desk.


China attaches great importance to the development of network technology. The national network project of China, which is supported by the 863 Program "high-performance computers and its core software", has made innovative achievements in high-performance computers, network software, network environment and application. China national network, a network test bed with the capacity of 18trillion aggregate computing, supporting network research and network application, has been officially opened and operated on December 21, 2005. This means that through network technology, China has effectively integrated the computing resources of large-scale computers nationwide, forming a powerful computing platform, helping scientific research institutions and scientific and technological workers to realize the sharing of computing resources, data sharing and collaborative cooperation.

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