Differences between routers, switches, hubs, Layer 3 switches and repeaters

It is a single-function network interconnection device. Working in the physical layer is something you can see. Mainly used to strengthen the signal. It is generally used when the signal transmission is far away, which is equivalent to an amplifier.

Hub:

Hub belongs to the basic equipment in data communication system. Like twisted-pair transmission media, it is a hardware device that needs no software support or little management software. Widely used in various occasions. Hub works in the local area network (LAN) environment and is applied to the first layer of the OSI reference model like the network card, so it is also called the physical layer device. The hubs are electrically interconnected. When the environment for maintaining LAN is logical bus or ring structure, a physical star or tree network structure can be established with the hub. In this regard, the hub acts as a multi-port repeater. In fact, the hub is actually a kind of repeater. The only difference is that the hub can provide more port services, so the hub is also called a multi-port repeater.

Router:

Routers work at the third layer of the OSI model, namely the network layer. Routers use the network address (IP address) on the "logic" defined by the network layer to distinguish different networks, realize network interconnection and isolation, and maintain the independence of each network. Routers do not forward broadcast messages, but limit broadcast messages to their own networks. Data sent to other networks is first sent to the router, and then forwarded by the router.

Switch:

Lan switches has many ports, each with its own dedicated bandwidth, which can be connected to different network segments. The communication between switch ports is simultaneous and parallel, which greatly improves the information throughput. To further improve performance, only one device can be connected to each port.

Bridges:

Bridge acts on the data link layer of OSI architecture and can distinguish the MAC addresses of packets. In fact, the bridge will compare the packet location of the received data with its known network segment address, and if the packet address is not in the same network segment, it will forward the data.

Bandwidth * * * Enjoy devices should be equivalent to routers. The purpose of resource sharing can be achieved.