What are the key points in the formation and maintenance of local area networks?

The first part is theory and solutions, and the second part is solutions.

The first level of LAN mutual access:

Operating system default: An empty connection can be established using the ipc$ channel, and the number of accounts on the machine can be enumerated anonymously. Obviously, there are certain safety risks.

Hackers can use the scanner to find a computer that is open to IPC$ sharing, and anonymously enumerate all user accounts on that machine, which can be easily hacked if the user's account does not have a password. Null connections have been disabled in this system. In this way, even if the user does not have a password, there is not much risk in surfing the Internet.

However, it affects the mutual access of the local area network.

The second level of LAN mutual access:

Local Security Policy - Security Options - Accounts: Local accounts with blank passwords are only allowed to log in to the console. The system default is: Enabled.

Login failed: User account restrictions .........This is due to a security policy in the XP system that prevents others from accessing your computer when you have an empty password. If your computer is home and you don't need a password, you should set it to:

Disabled. The third level of LAN mutual access:

Control Panel - Firewall - Exceptions - File and Printer Sharing. System default: Do not select this option.

Hehe, it's really infuriating. This is because XP also has a level, which is the firewall, which must be allowed by the firewall.

Then it's time for the antivirus software to be installed.

4. Networking type.

1.Network card Network card can be divided into three types according to the type of connector: AUI, BNC and RJ45 connector, which are used to connect three different network cables, namely AUI cable and RG-58A U electric twisted pair cable [including unshielded cable (UTP) and screen twisted pair (STP)]. AUI connectors and cables, due to the troublesome wiring construction, have been eliminated from the market, I will not describe in detail.

The use of BNC connectors and RG-58A U network cables to construct the network is not only the most inexpensive, but also easy to install, so it is favored by DIY people. The RJ-45 connector is used to connect twisted pair cables, and is also widely used because of its easy expansion and convenient system debugging.

The network card can be divided into four types: PCI, EISA, PCI, and SISC in the form of bus. It can also be used according to the data transmission bandwidth of 10m s, 100m s, 10m-100m, 100m network card, and the more used is 10m-100m adaptive network card.

2.The type of network.

Generally speaking, LAN topologies can be roughly divided into bus, star, and ring networks.

The bus structure uses a common network cable (usually a thin cable) to connect all computers. It has the advantage of low cost and simple wiring, but there is a fatal disadvantage that if any node of the entire network fails, the entire network will be paralyzed. This topology is gradually being phased out.

Computers with less than 10 computers are more suitable for bus-type networking, and more than 10 computers are troublesome to maintain and prone to failure.

A star is when all computers are connected to a hub (or switch, router, etc.), through which signals are passed between the computers. Its advantage is that the local line failure of the network will only affect the local area, and will not cause the entire network to be paralyzed, which is convenient for maintenance. The disadvantage is that the cost is higher (relatively speaking).

As you can see from the above, the bus type does not use a hub, while the star type needs at least one hub to make the network work, thus increasing this part of the cost. Star networking is more popular, and it is suitable for any computer networking.

The ring structure is only used by IBM, and it is rarely used at present, and it is not considered to be the trend of the future.

Start by determining how many computers there are in the company. Then according to the division of the department, wiring. on the switch. Assign the relevant permissions. That's it. As for maintenance, it is adjusted according to the function. When designing, be careful to leave room for improvement. for later expansion.

"LAN Construction and Maintenance" introduces in detail the formation, application and maintenance methods of LAN. The contents of the book include understanding LAN, selecting LAN equipment, LAN design and planning, simple LAN construction, office LAN construction and application, office application server construction, wireless LAN planning and formation, LAN access to the Internet, LAN management application, LAN security maintenance, LAN data backup, and LAN troubleshooting.

Home LAN:

The external network is connected to the modem, the modem is connected to the router WAN port, the router is connected to the computer (switch), the router LAN port address is set, the IP address of other extensions, and the default gateway: Mask DNS is set according to the ISP.

2.Cell Broadband:

Connect the router to the WAN port of the external network, connect the router to the computer (switch), set the LAN port address of the router, the IP address of other extensions, and the default gateway: Mask DNS is set according to the ISP.

Large LAN (Internet café): external network access - router (firewall) - core switch - aggregation switch - access switch - computer.

Large LAN (Internet café): Extranet - router - core layer switch - aggregation layer switch - access layer switch - computer.

Don't know what your home LAN means.

Generally speaking, the model is connected to the router, and the router uses NAT, so the router is the gateway.

Dude, that's a question for you. LAN Requirements for Networking. Thinking clearly, I'm asking, Okay. Not sure what you're thinking.

LAN technology was born in the 70s of the 20th century and developed rapidly after the 90s, mainly used to connect various data communication devices in a small geographical area. With the advent of local area networks, computer networks have been recognized by most people and penetrated into various fields in a very short period of time. Therefore, LAN technology is very popular in the current technology field, and various types of LAN continue to develop and are widely used, thus further promoting the development of the information society.

Now, many homes and units have formed a local area network. In order to enable readers to independently set up and manage the local area network, master the basic knowledge of computer network technology, understand the software and hardware equipment required to form the network, and the method of connecting to the Internet, the author of this book combines many years of experience in computer network teaching and LAN construction and management, systematically and comprehensively introduces the relevant knowledge of the formation of local area network, and introduces some management and maintenance skills of local area network.

The book is divided into 14 chapters, ranging from shallow to deep, and each chapter is both independent of each other and related to each other. Chapter 1 introduces the basics of building a local area network; Chapters 2 and 3 introduce the hardware equipment and network operating system required to set up a local area network, and also introduce the method of configuring network services in the system. Chapters 4 and 5 introduce the creation and management methods of Web site servers and FTP site servers. Chapters 6 and 9 respectively introduce the methods of setting up a local area network in different places such as homes, dormitories, Internet cafes, and offices. Chapter 10 describes how to set up and manage wireless LANs; Chapter 11 describes methods for remote control of computers in a local area network using remote assistance, remote desktop, and third-party software; Chapter 12 describes the settings that can improve the security of the local area network; Chapter 13 describes ways to optimize LAN performance and how to upgrade LAN with hardware and software; Chapter 14 describes some of the most common LAN faults and how to fix them.

This book pays equal attention to theory and examples, and systematically introduces the methods and skills of building and maintaining local area networks. Among them, the theoretical knowledge focuses on explaining the concepts that should be mastered when building and maintaining a local area network, and then introduces the operation methods of forming and maintaining a local area network through example exercises, and achieves the purpose of flexible application.

In addition, Chen Xiao, Wu Xiaotian, Xu Fan, Chen Xiaoxia, Zhang Lihao, Wang Lan, Yan Xiaowen, Du Siming, Peng Wanbo, He Yajun, Hong Yan, Kong Xiangliang and other comrades participated in the compilation and production of this book. Here, the editors would like to express their sincere gratitude to them!

This book covers a wide range of knowledge, but due to the hasty preparation time, the shortcomings in the book are inevitable, and we sincerely invite readers to criticize and correct.