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Anonymous users2024-02-12Just buy a router and connect it according to the instructions.
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Anonymous users2024-02-11The basic components of a local area network.
1.Composition of the local area network.
The LAN consists of two parts: network hardware and network software. Network hardware mainly includes: servers, workstations, transmission media and network connection components.
Network software includes network operating system, network protocol and corresponding protocol software for controlling information transmission, and a large number of network application software. Figure 4-1-1 is a common type of local area network.
Figure 4-1-1 A common local area network
Servers can be divided into file servers, print servers, communication servers, database servers, etc. The file server is the most basic server on the local area network, which is used to manage the file resources in the local area network; The print server provides users with a network share printing service; The communication server is mainly responsible for the communication between the local LAN and other LANs, host systems or remote workstations; The database server provides users with services such as database retrieval and update.
A workstation, also known as a client, can be a general personal computer or a specialized computer, such as a graphics workstation. Workstations can have their own operating system and work independently; The shared resources of the server can be accessed through the network software running the workstation, and the common workstations at present are Windows 2000 workstations and Linux workstations.
The connection between the workstation and the server is achieved by means of a transfer medium and a network connection component.
Figure 4-1-2 Network connection component.
The NIC is the interface between the workstation and the network. In addition to acting as a physical interface for workstations to connect to the network, it also controls the sending and receiving of data frames (equivalent to physical layer and data link layer functions).
A hub, also known as a hub, is the ability to centrally connect the endpoints of multiple lines together. Hubs can be divided into two types: passive and active. A passive hub is only responsible for connecting multiple lines together and does not do any processing of the signal.
Active hubs have signal processing and signal amplification functions.
The switch works in a switching mode, which can centrally connect the endpoints of multiple lines together, and supports multiple concurrent connections between port workstations, so as to realize the concurrent transmission of data between multiple workstations, which can increase the LAN bandwidth and improve the performance and quality of service of the LAN. Unlike hubs, hubs mostly work in broadcast mode, and all workstations connected to the same hub share the same rate; All workstations connected to the same switch are exclusively connected to the same rate. As shown in Figure 4-1-3.
Figure 4-1-3 Switched Ethernet example.
In addition to network hardware, network software is also an important part of a local area network. At present, the common network operating systems mainly include Netware, Unix, Linux, and Windows NT.
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