Networking Basics: What are Broadcast Domains?

A broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer.

Let’s say you have several computers connected to a Layer 2 switch. The reason the device is called a Layer 2 switch is that the hardware learns and stores the MAC address (also known as the physical address) of a device’s network cards.

By storing those hexadecimal numbers, the switch can make intelligent decisions about how to route packets to and from a specific device. Layer 2 switches can also be configured with VLANs to service multiple networks. Since the switch has learned about the devices that are connected, it also knows (from the switch configuration) what network those devices are connected to.

What exactly a broadcast domain does
From our definition of a broadcast domain, we can also state that a broadcast describes a process that forwards packets to all machines on the network. Only devices communicating within a given network will receive the broadcast traffic.

Read more: ms lan manager

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