What is a relay device and a conversion device?
Routers are used to connect multiple logically separated networks. Provide the best communication path for users, routers use routing table selection path for data transmission, the distance between the routing table contains a list of network address and the address, routing table lookup data packets from the current location to the destination address of the router using the correct path. The router uses the least time algorithm and optimal path algorithm to adjust the path of information transmission, if a network path fails or congestion, the router can choose another path, in order to ensure the normal transmission of information. Routers can convert data formats and become necessary devices for network interconnection between different protocols.The functions of the bridge are routers, which have their own network addresses on the network, and the bridges do not. The network connected by the bridge is still a logical network, and the router divides the network into several logical subnets. In order to manage the network, it is generally necessary to use routers to divide large networks into multiple subnets. Internet is made up of a wide variety of networks, and routers are a very important part of the entire Internet router. Intranet is integrated into Internet and doubles as Internet services, routers are essential components, and routers are configured more complex.
A bridge connects two similar networks and manages the flow of network data. It works at the data link layer, not only can extend the distance or range of the network, but also can improve the performance, reliability and security of the network. Networks 1 and 2 through the bridge connection, the bridge receives 1 network packets sent, check the data packet in the address, if the address belongs to the network 1, it will give up, instead, if it is 2 network address, it will continue to send to the network 2. This allows the bridge to isolate information, divide the network into multiple segments, isolate the security segment, and prevent unauthorized access to other network segments. Due to the segmentation of the network, each segment is relatively independent, and the failure of a network segment will not affect the operation of another network segment.The bridge can be a special hardware device, or it can also be implemented by the bridge software installed by the computer. At this time, the computer will install a number of network adapters (network cards).
A hub is a special repeater that can be used as a switching device for multiple network segments, as several hubs can be cascaded. Smart hubs can also integrate network functions such as network management and routing. With the development of network switching technology, hubs are gradually being replaced by switches.
Due to the effect of transmission line noise, carrying digital signal or analog signal can transmit information in a limited distance, repeater function is regenerated and sending the received signal, thereby increasing the signal transmission distance. It is the simplest network interconnection device that connects two or more network segments of the same network. If the length of the cable Ethernet Repeater often use bus standard, thinnet each maximum length of 185 meters, up to 5, thus increasing the repeater, the maximum length of the cable network can be increased to 925 meters. In general, the network at both ends of the relay is a network segment rather than a subnet.
