Broadcast domain/conflict domain

Conflict domain: each node in the same conflict domain can receiveAll sent frames (Note: All sent frames, not just broadcast frames);

Broadcast domain: the network can receive messages from any device.Broadcast FrameSet of all devices;

The conflicting domain is based on the first layer (Physical Layer)

The broadcast domain is based on the second layer (data link layer)

Broadcast domain: if the site sendsBroadcast SignalThe range in which the signal is received. Generally, a LAN is a broadcast domain.

Conflict domain: one site sends a message to another siteSignal(Not broadcast signal ). In addition to the target site, how many sites can receive this signal, these sites constitute a conflict domain.

All the ports of the hub are in one broadcast domain or conflict domain;

All the ports of the switch are in the same broadcast domain, and each port is a conflict domain;

Each port of the router belongs to a different broadcast domain.

The broadcast domain consumes bandwidth and resources. For example, if the three hosts A, B, and C are in the same broadcast domain, a needs to send packets to B, but C can also receive the packets, at this time, C needs to process and judge before it can discard the data packet, which is a waste of resources and bandwidth.