With the gradual maturity of technology and market, the network is changing people's traditional views on "network" and "informatization" with its ubiquitous and ever-present network connection. At present, due to the reasons of ideas and habits, more than 50% of the campus networks that have been built have not really brought into play the due benefits of the Internet, even in universities. Therefore, improving the efficiency of campus network is one of the important assessment indicators of campus network construction.
1.2 integrated wiring system
In addition to the above international standards, the design of integrated wiring system should also meet the domestic standards such as China Building Electrical Code, Industrial Enterprise Communication Design Code, China Engineering Construction Standardization Association Standard, Technical Requirements for Cables and Optical Fibers for Integrated Wiring, and Code for Engineering Design of Integrated Wiring System for Buildings. The wiring system is a modular open system, which is mainly composed of six subsystems. See 1 for the schematic diagram of these six systems:
2 Requirements analysis and topology structure
2. 1 Functions of Campus Network
1, information exchange function
(1) Internet information service-let the school know about the world and let the world know about the school.
(2) Information Service In school, the receiver of information is the publisher of information.
2. Students' learning function
The network has greatly changed students' learning style. They use the internet to learn independently and improve their learning ability. They need to look up information on the internet and send the completed homework to the teacher by email. Encourage students to establish their own web pages, including English corner, appreciation of famous stations, hardware gallery, programming workshop, member web pages, game forums, computer culture and other columns.
3. Library function, taking the library as the information source.
Libraries can open electronic lesson preparation rooms and CD-ROM reading rooms for teachers and electronic reading rooms for students. The procurement, classification, cataloging, circulation, inquiry, periodicals and other links are all managed by computer automation, and online bibliographic retrieval service can be provided on the campus network, so that readers can find books, browse the full text, inquire about the borrowing situation, make an appointment and renew the loan procedures online. Then realize the "computerization" of book management and "networking" of information inquiry.
3 Network Center
With the continuous progress of computer technology, modern computer network transmission technology has made rapid development. There are many optional mainstream network technologies in local area network and metropolitan area network. Below, we will briefly explain their characteristics according to different technology types, and provide scientific basis for our technology selection.
3. 1 traditional Ethernet technology
The key of early LAN technology is how to solve the problem that multiple network nodes connected to the same bus can share a channel in order. It is by using CSMA/CD technology that Ethernet has successfully improved the transmission utilization rate of LAN shared channel, and has been developed and popularized.
3.2ATM network
The term "ATM (Asynchronous Transfer Mode)" was originally produced corresponding to the "STM (synchronous transfer mode)" technology commonly used in telephone relay communication. It not only draws lessons from the "connectivity" service and service quality assurance of circuit switching in traffic communication, but also maintains the flexibility of variable bandwidth and burst transmission in traditional networks such as Ethernet and FDDI, thus becoming the most widely used, advanced technology and best transmission effect network interconnection at present. The following is the schematic diagram of network system scheme design II.
4 Office subsystem
4. 1 Campus Office System
In the daily work of schools, there are more and more working methods and processes that can be simplified and improved through the network. For example:
1. Circulation of campus official documents and notices (i.e. office automation). Traditional printing, mailing and other methods become complicated and inefficient. This kind of work can be done quickly and conveniently by using the network, and you can see official documents and notices anytime and anywhere, regardless of time and place.
2. Educational information management (i.e. information service, information sharing, etc.). ). Including all kinds of information related to educational administration, such as curriculum arrangement and teacher arrangement. Using the network to manage this information is more convenient and faster than the traditional way.
In addition, the office subnet can provide various services for school leaders and functional departments at all levels (such as office management, ideological education management, educational administration management, general affairs management, financial statement management, etc.). ), to promote the realization of modern school management.
In view of the fact that the function of school office computer is mainly to query, modify, add and delete network data, network data should be transmitted faster to improve office efficiency. In addition, if the office computer can meet the requirements of supporting video transmission, it is required that the network has enough bandwidth and adopts the switched 10/ 100M port.
Electronic library system
Using network technology to realize the management of campus library is an important content of campus network construction. Making full use of network technology in school library management will bring about the following radical changes:
1. Book query and management
After using network technology, book inquiry will become very convenient. Teachers and students can index books according to a variety of key information, which not only saves time, but also can find the required bibliography more accurately. Because all kinds of borrowing information can be displayed on the computer in time, it greatly facilitates the management of the library.
2.IC card can effectively manage the school reading room.
The library is a relatively independent system, which can be equipped with a host connected to the CD-ROM library server and several query terminals. For teachers and students to find books and directories through the corresponding indexing software. The CD-ROM library server adopts special SCSI CD-ROM drive to realize the storage and access of various CD-ROM books, magazines and files.
Campus network management system
The normal operation of campus network can not be separated from a set of powerful information system software, which can provide a guarantee foundation for the comprehensive application of campus network.
Campus network management system generally has the following functions.
System login: system users must check their identity when logging in to the system. Network users with different identities have different operating rights to the information on the system. The information flow of the system can be set by the school according to its own actual business process. Score management: including the functions of inputting, modifying, browsing and querying the score information related to each exam. Users with the operating authority of the score management function can input and output information related to scores, such as printing and outputting student status cards, single-subject scores and semester scores, or printing and outputting according to specified conditions (such as student number and ranking). Network users with different permissions can only operate the functional permissions assigned by the system. If the network users are students, they can only browse the score information according to the default permissions of the system, and cannot modify the information. Student status management: including freshman information management, freshman placement, student information management, etc. Class management: it mainly manages the class information of the school, provides automatic upgrade operation across school years, and the system can also repeat some students.
4.2 Hardware equipment
The specific equipment is as follows:
Central computer room: 3com Company switch 4007 is selected as the central switch, and two 9-port Gigabit modules are added to provide 18 1000Base-SX interface for the whole campus network.
Teaching building: Choose 24-port and 12-port Hyperstack II switch 3300 to connect all information points.
Tape Library: The tape library is formed by stacking four 24-port Super Stack II switches 3300.
Teachers' dormitory: three super-stack II switches and 3300 switches are stacked.
Student dormitory: each building is stacked with two sets of four 24-port super-stack II switches and 3300 switches.
Restaurant: connected by 24-port Super Stack II switch 3300.
Office building: Four 24-port Super Stack II switches and 3300 switches are stacked and connected.
Gymnasium: connected by a 24-port Hyperstack II switch 3300.
5 security
5. 1 system security
Security technology of application system
Due to the complexity of the application system, the security of the application platform is the most complicated part of the whole security system. The following section lists the security issues and related technologies of the main application platform services in Internet/Intranet.
1, Web server application security
Web server is an important foundation for campus publicity and business development. Because of its importance, it has become one of the first choice targets of hacker attacks.
2. E-mail system security
E-mail system is also a service system that must be open to the outside world. Due to the complexity of e-mail system, there are many security loopholes and great harm.
3. Operating system security
Almost all operating systems in the market have found security vulnerabilities, and the more popular the operating system, the more problems it finds. For the safety of the operating system, in addition to constantly adding security patches, you also need:
(1) Check the system settings (storage mode of sensitive data, access control, password selection/update).
(2) System-based safety monitoring system.
5.2 anti-virus technology
L virus protection technology
Virus has always been one of the main problems of information system security. Due to the extensive interconnection of the network, the transmission route and speed of the virus have been greatly accelerated.
The main technologies of virus protection are as follows:
(1) Stop the spread of the virus.
Install virus filtering software on firewall, proxy server, SMTP server, network server and groupware server. Install virus monitoring software on desktop computer.
(2) Check and remove the virus.
Use antivirus software to check and remove viruses.
(3) virus database upgrade.
The virus database should be constantly updated and distributed to the desktop system.
(4) Install Java and ActiveX control scanning software on firewalls, proxy servers and PCs, and prohibit unauthorized downloading and installation of controls.
conclusion
The establishment of a campus network system needs to be considered from many aspects, involving not only many technical problems, but also the integration of network facilities, information resources, professional applications and the construction of an information-based teaching environment system. This paper describes in concise language how to build a campus network system with reliable performance, advanced technology and rich functions.