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Cisco CCNA Certification: Defining Broadcast Domains

When you're studying to pass the CCNA exama switch will forward a broadcast out every
and earn your certification, you'resingle port on that switch except the one
introduced to a great many terms that areupon which it was received. However, Cisco
either totally new to you or seem familiar,switches allow the creation of Virtual Local
but you're not quite sure what they are. TheArea Networks, or VLANs, that are logical
term "broadcast domain" falls into the lattersegments of the network. A broadcast sent by
category  for  many  CCNA  candidates.one host in a VLAN will not be forwarded out
every other port on the switch. That
A broadcast domain is simply the group of endbroadcast will be forwarded only out ports
hosts that will receive a broadcast sent outthat are members of the same VLAN as the host
by a given host. For example, if there aredevice  that  sent  it.
ten host devices connected to a switch and
one of them sends a broadcast, the other nineThe good news is that broadcast traffic will
devices will receive the broadcast. All ofnot be forwarded between VLANs. The bad news
those devices are in the same broadcastis that no inter-VLAN traffic at all is
domain.allowed by default! You may actually want
this in some cases, but generally you're
Of course, we probably don't want everygoing to want inter-VLAN traffic. This
device in a network receiving every singlerequires the use of a router or other Layer 3
broadcast sent out by any other device in thedevice such as a Layer 3 Switch. (Layer 3
network! This is why we need to know whatSwitches are becoming more popular every day.
devices can create multiple, smallerBasically, it's a switch that can also run
broadcast domains. Doing so allows us torouting protocols. These switches are not
limit the broadcasts traveling around ourtested  on  the  CCNA  exam.)
network - and you might be surprised how much
traffic on some networks consists ofThat router we just talked about also defines
unnecessary  broadcasts.broadcast domains. Routers do not forward
broadcasts, so broadcast domains are defined
Using the OSI model, we find devices such asby  routers with no additional configuration.
hubs and repeaters at Layer One. This is the
Physical layer, and devices at this layerKnowing how broadcasts travel across your
have  no  effect  on  broadcast  domains.network, and how they can be controlled, is
an important part of being a CCNA and of
At Layer Two, we've got switches and bridges.being a superior network administrator. Best
By default, a switch has no effect onof luck to you in both of these pursuits!
broadcast domains; CCNA candidates know that



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