Keywords: small and medium-sized enterprises; Office LAN; Network construction; Networking scheme; Network protocol; Server; firewall
Find some computer network introductions from the internet to replace the above contents and then translate them into English! English can be translated through the previous translation and written here!
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At present, the number of small and medium-sized enterprises in China has exceeded100000. In the national economy, 60% of the total output value comes from small and medium-sized enterprises and provides more than 70% employment opportunities for the society. However, the informatization of small and medium-sized enterprises, which have always occupied a vital strategic position in China's national economic and social development, is very backward. In the future, how to deal with the rapidly changing and fierce domestic and international market environment and how to use network technology to quickly enhance the core competitiveness of enterprises will become the key to the success or failure of enterprises.
Here is something to replace the above words.
The first part is demand analysis.
1. 1 Shenyang Hayes Travel Co., Ltd. Network requirements description replaces the company name itself.
Company background: The company was established on February 2, 20081day. Located in the business circle of Taiyuan Street in Shenyang, with employees 18. Its main business is domestic travel in the province, and its business scope is Chinese mainland and Hongkong.
Company management structure:
Company's current computer situation: outreach customers are the company's main business departments, with one computer for all employees, two computers in the reception department, three tour guides in the province, three tour guides outside the province, and 1 in the finance department.
1.2 network system construction goal
According to the survey of general manager and business department of Hayes Company, it is determined that the network design of Hayes Company should achieve the following objectives.
Realization method of target classification and target description
Integrated Cabling Integrated Cabling is the basic physical communication platform of the company's computer network, so we should focus on the network bandwidth to meet the needs of current file transmission and the future development of e-commerce and multimedia applications. The wiring system adopts international standard star topology structure.
The design and installation of wiring system conform to ISO/IEC11801standard.
Adopt unified line specifications and equipment interfaces.
Use more than five twisted pairs for wiring.
Local area network computer local area network is the foundation of the company's office network. When designing, we should consider the file transfer that is most used in the company's office network at present, and take into account the needs of developing multimedia applications such as e-commerce and network conferences in the future. The server is a PC-level server with stable performance and good I/O.
By using a fully switched network, all 100M are switched to the desktop.
Switches and network cards should choose brands with reasonable cost performance and good compatibility.
The printing service company has a printing device HP2000C, which allows the company's grass-roots employees and the general manager to print documents together, but it is stipulated that the general manager's emergency documents should be printed first.
The replacement of printing equipment model is realized by * * * sharing printers and setting printing priority.
Chapter II Network Structure Design
2. 1 Overall functional design
The system design of Hayes Travel Co., Ltd. includes the following contents:
1, network topology design;
2. System integrated wiring design;
3. Selection of network equipment;
2.2 Network Topology Design
1, topology design principle:
1) Flexibility: When users' needs change, the designed topology should be easy to reconfigure the network;
2) Reliability: Network reliability is very important for the reliable operation of information systems, so the topology design should be convenient for network fault detection and fault isolation;
3) Low cost: Choose the corresponding topology structure according to the actual situation of management information system construction to reduce the installation cost of media.
According to the above principles of designing network topology and the characteristics of bus topology, star topology and ring topology commonly used now, Century Paper Company adopted star topology when designing network structure.
2. The schematic diagram of the network topology is as follows:
2.3 System Integrated Wiring Design
2.3. 1 system integrated wiring principle
According to the design specification of integrated wiring system, integrated wiring system should follow the following principles:
1. Design integrated wiring according to relevant standards in Code for Design of Integrated Wiring System.
2, wiring should comply with international standards, fully ensure the high-speed operation of computer network system and reliable transmission of information.
3. Wiring not only meets the current communication technical requirements, but also meets the future needs, and can realize data communication, real-time voice communication and image transmission.
4. Wiring connectors should be modular standard parts for future development.
5, wiring should have high reliability.
6. Meet the versatility and flexibility of network system design and communication system design.
2.3.2, integrated wiring subsystem design
The integrated wiring of Hayes Travel Co., Ltd. includes three parts: workspace subsystem, horizontal wiring subsystem and wiring room subsystem.
Workspace cabling system design Workspace subsystem consists of connecting wires and information sockets connected by terminal equipment, through which data information interfaces can be led out.
The distribution of information sockets and the setting of working areas are completely set according to the needs of users.
Media selection: According to the situation and specific needs of the information system in each building, choose over five types of twisted pair and five types of information sockets to meet the needs of high-speed data transmission. Can be installed and fixed on the wall, floor or other designated positions together with the double-hole panel.
According to the standard of enhanced integrated wiring system, each work area is equipped with two dual-port five-category information sockets and 44 * * design information points. When designing the workspace system, considering the actual needs of the company, the AMP module is selected for the company. The module is beautiful and easy to install.
In the design of horizontal wiring system, the cable part from information socket to wiring room is called horizontal subsystem.
Media selection: In order to meet the needs of information system network development and ensure the application of multimedia technology in the future, five kinds of unshielded twisted pair are selected and led out from the management distribution frame placed in the wiring room, and then led to the user's wall information socket through the wall trunking. Each single-hole socket pulls 1 five-level UTP to support data/voice transmission.
When designing the horizontal wiring system, taking into account the actual needs of the company, the company chose AMP super five-twisted pair.
The wiring closet subsystem aims to manage the corresponding areas in each wiring closet to ensure that the horizontal cable length of each information point does not exceed 90 meters. The management subsystem consists of distribution frame and jumper. According to the office distribution of Century Paper Company, a wiring room was set up in the meeting room.
Considering that the wiring cabinet should occupy as little building space as possible, we adopt a 2.0m 19 "cabinet as the wiring cabinet, in which AMP super-class 5 48-mouth distribution frame can be placed.
2.3.3 Schematic diagram of integrated wiring design
2.3.4 List of Integrated Wiring System Equipment: Modify the names of these things.
Serial number equipment name specification unit quantity unit price (yuan) combined price (yuan) Remarks
1 cabinet wins 42u121002100.
2 pairs of twisted-pair AMP Super Category 5m 1500 1.6 2500
3 Jumper Amplifier Super Category 5 Jumper Roots 48 10 480
4. There are more than 48 amplifiers in five categories, 1 1200 1200.
5 RJ45 AMP Superclass 5 RJ451001.5150
6 RJ45 Module AMP Super 5 Module 50 23 1 150
7 Dual Port Panel Amplifier Dual Port Panel Module 50 3 150
8 boxes of TCL 50 4.5 225
9 PVC trunking 40 15 600
Total 8555
2.4 network equipment selection
2.4. 1 network equipment selection principle
The core of Four Seas Travel Co., Ltd. is computer local area network. In the process of designing computer local area network, we will design according to the following principles. None of these cliches is to find something on the internet to replace the following content, then find the content yourself and change the following things! ! ! ! ! !
Practicality and advancement:
In the design of the network, the first thing to consider is practicality and operability, which is easy to manage and maintain and easy for users to master and learn to use. Adopt mature network technology, equipment and communication technology, and consider making full use of existing equipment and resources. Protect the original investment.
At present, with the rapid development of network technology, new devices are constantly emerging and maturing. On the basis of reality, practicality and feasibility, we should stick to a high starting point, try our best to choose advanced network technology and communication facilities, and position the technical level of computer network application at a higher level to meet the needs of future development.
Considering the company's application and meeting the needs of future development, Century Paper Company adopts fast Ethernet technology to realize the full exchange of 100M to the desktop, which can ensure the bandwidth of future e-commerce and network conference applications.
Open principle:
Only an open network that meets international standards can realize the interconnection of products of multiple manufacturers, that is to say, the interdependence among the hardware environment, communication environment, software environment and operating platform of the network should be minimized and their respective advantages should be brought into play. At the same time, it is necessary to ensure the interconnection of networks and create favorable conditions for the interoperability of information and applications. Fast Ethernet technology has matured and has been widely adopted by countries all over the world. Equipment from various manufacturers (such as Bay, 3Com, Cisco and Intel) can meet the design requirements. We plan to use Intel network equipment to realize the network of Hayes Travel Co., Ltd.
Extensibility principle:
The network architecture should be flexible and extensible to meet the increasing demand of users for the network. A network system with good scalability can enable users to expand the functions of existing network equipment by upgrading products and adopting new technologies at a lower cost, thus effectively protecting users' investment.
This system adopts star network topology structure, which can fully meet the expansion requirements. Modular switches are used in the network to promote system upgrade.
Reliability principle:
For users with strict real-time requirements, the network system must have certain fault-tolerant ability to ensure that the normal work of users will not be interrupted under unexpected circumstances. The network structure of this system mainly adopts star structure to ensure the reliability of the system.
Choose products from famous manufacturers:
Choosing products from well-known manufacturers can protect users' investment and meet the needs of continuous expansion and upgrading of network systems.
2.4.2 network equipment selection
According to the requirements of previous network construction principles, through comprehensive comparison, we think that Intel's network products have the characteristics of reasonable cost performance, mature technology, wide user base and comprehensive product series, and all kinds of switches are available to meet various business needs. The following introduces the network devices involved in this system one by one.
1, Intel Express 460T switch, change all the models and names of the machines and equipment, or your paper will be copied! Find different switch manufacturers, switches and network cards online and replace the contents in the table below!
By using optional modules, this 16/24 port switch can provide 1000M uplink module, thus extending the performance of fast Ethernet to the desktop.
Characteristic advantage
Advanced flow control (802.3x) can reduce congestion and prevent packet loss.
Link aggregation aggregates multiple ports to support higher bandwidth connections and provide additional network scalability.
IP multicast fine-tuning can reduce congestion when broadcasting communication to multiple desktops.
Redundant power supply has fault tolerance and reliability.
2. Intel series network cards
PILA8460C3 PRO/ 100 desktop network card has remote wake-up and remote startup.
PILA8470C3 PRO/ 100 server network card
Performance introduction conforms to PCI local bus specification version 2.0 or higher.
The main architecture of PCI 32-bit bus provides high throughput with low CPU utilization.
Five kinds of unshielded twisted pair supporting 100Mbps mode.
List of network devices
Serial number equipment name specification unit quantity unit price (yuan) combined price (yuan) Remarks
1 Switch Intel Express 460T/24 sets 2 8350 16700
Two network cards PILA8470C3 1 650 650
3 network cards pila 8460 c 3 14 250 3500
Total 20850
2.5 Selection of Network Server and User Computer
2.5. 1 network server selection
At present, the mainstream PC servers in the market mainly include products from HP, IBM, Compaq and other manufacturers. They all provide different series of products for different application scales, and adopt advanced system architecture and memory subsystem, which can provide powerful and excellent performance and have the best I/O bandwidth. In the absence of obvious technical differences, a good after-sales service system and timely and comprehensive technical support have become important criteria for selection.
We suggest choosing IBM NF 1000 series products, because it has innovative usability features, such as intelligent hot exchange, built-in duplex equipment, intelligent redundant power supply, which can protect data to the greatest extent and reduce downtime, and contains management tools, which can simplify network and server management. More importantly, IBM can provide timely and comprehensive support, thus protecting the valuable investment made by users. At the same time, because the server has adapted to Intel's latest Pentium III chip and introduced a brand-new Pentium III chip model with excellent performance, it has become an ideal choice for file sharing, high-speed communication and database applications.
Brand IBM NF5000
Performance introduction Pentium 550MHz processor, 5 12KB Catch.
IBM 128MB EDO memory
9.2GB hot-swappable SCSI disk module
3.5-inch hard disk mounting tray (set of three, not hot-swappable)
32CD
User computer selection
User computers choose economical compatible computers. One for the finance department and one for the personnel department. Other departments and employees use existing computers to access the network.
The process of finding the print server configuration from the Internet has been added here!