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With the needs of society, bridges and gateways are gradually appearing in people's lives. How much do you know about bridges and gateways? Let's take a quick look at it today! Welcome to leave a message!
Bridge: A storage and forwarding device that connects two LANs and can be used to complete connections with network systems of the same or similar architecture.
In a LAN composed of hubs, communication between a large number of hosts is distributed through arp broadcasts. In order to reduce media contention (that is, collisions) in a shared environment, a bridge is generated, and its role is to broadcast. The domain is divided into a small collision domain. The information is forwarded through addressing and path selection. The traffic between the workstations on one network segment is limited to the range of the local network segment, and does not flow through the bridge to other networks. Go to the network segment. The effect of reducing traffic can be achieved, which increases the available bandwidth, but the broadcast domain remains unchanged.
The bridge works at the second layer of the data link layer, connects the two LANs, and forwards the frame according to the MAC address. It can be regarded as a “low-level router†(the router works at the network layer and forwards according to the network address, such as the IP address. ), and the port is very small (note the difference with the latter switch).
The bridge is divided into two categories: local bridge and remote bridge. The local bridge is mainly used to provide direct connection between multiple LAN segments in the same geographical area. The remote bridge is used to connect LAN segments in different areas.
Gateway: The function of the gateway is to repackage the information to suit the requirements of the target network environment. The gateway implements communication between different architectures and environments. After the data is re-converted by the gateway, it can enter a different network environment from one network environment, so that various network environments can understand each other and exchange each other's data in OSI. A protocol conversion function facility above the network layer.