There are two behaviors of surfing the Internet: one is to upload data, and the other is to download data. Uplink broadband refers to the speed of uploading, and downlink broadband refers to the speed of downloading data.
Uploading data refers to the behavior of users sending packets locally to the outside, including requesting packets and uploading files.
The speed of computer uploading data is also called network speed: the speed of computer uploading data is also called the uplink bandwidth of the network, and the network speed is referred to as network speed for short. The higher the speed, the faster the download speed and the shorter the time to open the web page. Generally, the speed of dial-up Internet access is 45.4K, and the broadband speed is 5 12K, 1M, 1.5M, 2M, 4M, etc. The wireless network speed is generally 1 1m or 55M.
1. The computer LAN consists of network workstation, network server, network printer, network interface card (NIC), transmission medium and network interconnection equipment.
2, the classification of computer local area network. According to the transmission medium used, it is divided into wired network and wireless network; According to the topological structure of the interconnection of various devices in the network, it is divided into bus type, star type, ring type, tree type and mesh type; According to the access control mode adopted by transmission media, it can be divided into Ethernet, label ring network, FDDI network and switched LAN.
3. Ethernet is the most commonly used LAN. It adopts bus structure, and all nodes are connected to a bus through Ethernet cards. The bus cable it uses is coaxial cable.
4. LAN services are connected to computers on the LAN, and only after logging in can they enter the network to access resources on the network. The services provided by local area network usually include: file service, also known as * * * storage service. When users log on to the network, the server's hard disk and CD-ROM drive will be mapped to the storage devices on the workstation.
Users can access the programs and data in the local disk just like using the local disk. Print service, information service, application service.
5. In the LAN composed of LAN software PC, there are two common working modes: peer-to-peer mode and C/s client/server mode. Peer-to-peer mode is that each PC in the network can be used as both a workstation and a server. The client/server model means that every computer in the network plays a fixed role. Whether it is a server or a client.