What other devices are connected to the monitoring network?

Generally speaking, the network equipment used in the monitoring system can be roughly divided into two categories: one is the equipment used in the local area network, which is also commonly known as the intranet architecture equipment in monitoring. The other is WAN equipment, which is also called extranet or cross-domain network architecture equipment in monitoring applications. In addition to the above two kinds of network devices, there are some other network devices that are produced in response to monitoring applications. 1. LAN network equipment 1. Network repeater: it is a device used to enhance the network transmission signal, thus extending the signal transmission distance. Because the transmission interface of each monitoring device has its longest transmission distance, once it exceeds this distance, the signal will be attenuated and unrecognizable. Therefore, it is necessary to strengthen the signal through the network signal repeater in order to expand the transmission of images or control data. 2. Bridge: This is a device that belongs to different subnets and is connected continuously. It can connect different monitoring LANs separated from multiple entities, making the whole monitoring system network look like a single operating network. Bridge can improve the reliability, security and efficiency of the network, and it is the simplest equipment in the monitoring system. 3.Hub: the device used to connect and monitor all IP monitoring devices on the LAN in Ethernet. This includes an IP camera, DVR or video server. But in the port; When two monitoring devices are connected to the hub port to transmit data to each other, other computer workstations or monitoring devices connected to them cannot transmit data at the same time. In addition, the monitoring equipment and the equipment connected to the computer workstation can form a local area network with star topology, which can expand the nodes of the network and is a common network equipment in the local area network of the monitoring system. 4. Switching hub (switch for short). Its function is roughly the same as that of a hub, and it is also used to connect monitoring devices on a local area network. But the biggest difference between a switch and a hub is that when any two ports of the switch transmit device data to each other, other ports can also transmit images or data at the same time. This switching technology can provide bandwidth for multiple network devices. Circuit switching and package switching are two basic switching technologies. In large-scale monitoring network, switching technology is an indispensable application technology, and this kind of switch is a network device born for switching technology. [Next] 2. Wide area network equipment 1. Router: A device that provides data transmission path selection. It can connect multiple networks with different architectures, and select the best transmission path for data packets according to the internal routing table, so that data can be delivered to the destination quickly. Networks belonging to different domains are connected to a device, which can be used for monitoring and networking of different monitoring subsystems. Its basic function is to exchange dynamic path information according to the standard of network protocol to determine the shortest path to the destination. Routers can also be seen as a bridge between LAN and WAN. 2. Gateway: This device is used to connect different types of subnets so that networks using different communication protocols can send and receive messages from each other. It belongs to a network connection device, and its main function is to monitor the application of the system, connect two heterogeneous networks in different domains, and convert the transmitted data according to the network protocol. Generally speaking, the gateway channel is regarded as a node of a network, and it also belongs to several connected networks in the configuration of the network. 3. Other network devices 1. Modem: used to connect communication equipment and monitoring equipment. Because the monitoring equipment sends and receives digital signals and the communication equipment transmits analog signals, the modem must convert these two signals before the monitoring equipment or computer signals can be transmitted through the modem and communication lines. 2. Terminal server: mainly used as a large monitoring host and workstation, which can be used by many people at the same time; Therefore, the modem can be connected to the terminal for standby, providing multiple communication routes so that the remote modem can dial to establish an online connection. 3.eather network card: used to connect monitoring equipment, computer workstations and networks. The network card has the physical address representing the equipment. The network card controls the way the computer workstation transmits signals on the network. This is some network transmission equipment that we often encounter in network monitoring project. Understanding the use of these devices will greatly help security engineers to apply and manage digital network monitoring.