Summary
Entering the 21st century, under the blessing of Internet + intelligent manufacturing. Companies and enterprises continue to improve their management and manufacturing capabilities. Technologies such as cloud computing, new infrastructure, and big data are changing with each passing day. Constantly impacting the management style. Enterprise LAN is becoming more and more important as the foundation of enterprise infrastructure. Accompanied by the needs of enterprise financial business integration. ERP system, CRM system, HR system, MES system. All-in-one card system has become an indispensable information system for enterprises. Designing an efficient and fast enterprise network has become the foundation that modern enterprises cannot avoid. Enterprise informatization and intelligent manufacturing have also achieved unprecedented development. The formation of local area network has become an essential step for enterprises to be in line with the international strategy.
The construction of enterprise LAN must be based on the principle of safety, reliability and standardization. Systematic and modular construction of an advanced, scalable, secure and stable production office network environment. In this way, it will be easy to maintain and use after the enterprise takes over later. It not only saves construction costs now, but also facilitates later upgrades and transformations, allowing enterprise networks to maintain healthy and dynamic development and upgrades.
The content of this graduation thesis is aimed at the actual office production of Xi'an Yinqiao Dairy Co., Ltd., and provides a set of complete LAN design solutions for medium-sized enterprises. On the basis of investigating the actual network environment and network requirements of the enterprise. Select the required network equipment and security equipment according to the network topology standards of the medium-sized enterprise LAN; and then focus on the theoretical basis such as the architecture and protocol types involved in the construction of the LAN, and carry out the selection of equipment types and transmission media to meet the actual situation of the company System and application environment requirements.
The construction and design content mainly includes the three-layer switching theory: the first choice for building a network is to choose a core switch with strong performance. Second, select the switching equipment supported by the aggregation layer, and finally select the desktop access layer network equipment. In short, we are looking for a three-tier structure design concept. Then, the three-layer switch is connected to the firewall to realize the forwarding with the Internet, realizing the intercommunication of the whole network and the remote access of the network. VLAN virtualized local area network technology divides different departments into different subnets and isolates each department. ACL (Access Control List) sets finance, R&D, etc. Only specific personnel and leaders have access rights. Low-cost Internet access is realized by applying for a public network IP to the operator and using NET address conversion technology to convert the intranet IP address in the enterprise LAN to a public network IP. At the same time, it provides protection for enterprise security through built-in firewall policies, intrusion detection systems, and Internet behavior auditing equipment.
【 Keywords】：LAN; network equipment; enterprise; planning and design Table of
contents 1 introduction
2 introduction to
LAN Design scheme 4.1 Network topology design 4.2 Equipment selection 4.3 VLAN division 4.4 IP address planning 4.5 NAT and routing protocol 4.6 Network security 5 Conclusion Acknowledgment With the rapid development, especially the information technology represented by computer technology, its development is changing with each passing day. It not only affects our way of life, but also greatly changes it. Taking a closer look at our surroundings, we can see that every aspect of our life and work is invisibly infiltrated by the computer network, and every step of progress is inseparable from the computer network. Our learning and living conditions are also more convenient due to the rapid popularization of the Internet, which connects us with the outside world more closely.
The revolutionary leap in the development of human information civilization is a qualitative change caused by the birth and use of computer networks. And people's urgent need for information data sharing and information exchange in life also makes network technology come into being and develop rapidly. This is the requirement of the times and the necessity of progress. In 1995, the establishment and use of the Educational Research Network (CERNET) marked that the construction of local area networks has entered a stage of vigorous development. The establishment and use of local area network has improved the quality of enterprises and production, improved the conditions of production and research and development, accelerated the process of enterprise informatization, and has very important and far-reaching significance for the development of information-based manufacturing and intelligent manufacturing. Local area network contains many kinds of technical ideas, such as topology, if integrated wiring, network environment security, maintenance, etc., and intelligence and easy maintenance are also included in its content. Through the discussion of this graduation design topic, I hope to help you understand the construction process of enterprise LAN and the various network technologies involved in it, and enable you to learn network technology knowledge or carry out network engineering construction for small and medium-sized enterprises in the future. learn from.
