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Cisco CCNA Certification: Defining Broadcast Domains

Whenever you’re finding out to pass the CCNA examination and earn your certification, you’re introduced to an important many phrases which are either totally new to you or appear acquainted, however you’re not quite sure what they are.  The term “broadcast area” falls into the latter category for many CCNA candidates.

A broadcast area is solely the group of end hosts that may receive a broadcast sent out by a given host.  For example, if there are ten host units linked to a switch and one in all them sends a broadcast, the other 9 devices will receive the broadcast.  All of those gadgets are in the identical broadcast domain.

Of course, we probably don’t want each system in a network receiving each single broadcast despatched out by some other machine in the network!  This is the reason we need to know what gadgets can create multiple, smaller broadcast domains.  Doing so allows us to restrict the broadcasts traveling round our network – and you might be surprised how much traffic on some networks consists of unnecessary broadcasts.

Utilizing the OSI mannequin, we find gadgets equivalent to hubs and repeaters at Layer One.  That is the Physical layer, and devices at this layer have no effect on broadcast domains.
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At Layer Two, we’ve got switches and bridges.  By default, a switch has no effect on broadcast domains; CCNA candidates know that a switch will ahead a broadcast out every single port on that change except the one upon which it was received.  Nevertheless, Cisco switches allow the creation of Digital Local Area Networks, or VLANs, which might be logical segments of the network.  A broadcast sent by one host in a VLAN will not be forwarded out each other port on the switch.  That broadcast shall be forwarded only out ports which can be members of the identical VLAN because the host device that despatched it.

The excellent news is that broadcast traffic won’t be forwarded between VLANs.  The unhealthy information is that no inter-VLAN visitors in any respect is allowed by default!  You may actually want this in some circumstances, however generally you are going to need inter-VLAN traffic.  This requires using a router or other Layer 3 system similar to a Layer three Switch.  (Layer 3 Switches are rising in popularity every day.  Principally, it’s a switch that may also run routing protocols.  These switches aren’t tested on the CCNA exam.)

That router we just talked about additionally defines broadcast domains.  Routers do not ahead broadcasts, so broadcast domains are defined by routers with no further configuration.

Knowing how broadcasts travel throughout your community, and how they are often controlled, is an important part of being a CCNA and of being a superior community administrator.  Best of luck to you in both of these pursuits!

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