: Collision domains
a part of a network where packet collisions
can occur. A collision occurs when two devices send a packet at the same time
on the shared network segment. The packets collide and both devices must send
the packets again, which reduces network efficiency. Collisions are often in a
hub environment, because each port on a hub is in the same collision domain. By
contrast, each port on a bridge, a switch or a router is in a separate
collision domain.
Router: every port at a router is collision domain.
Switch: every port at a switch is collision domain.
Hub
: all is one collision domain
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broadcast
domain :
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. A broadcast domain can be within the same
LAN segment or it can be bridged to other LAN segments. A broadcast domain
encompasses a set of devices for when one of the devices sends a
broadcast, all the other devices receive a copy of the broadcast. For example,
switches flood broadcasts and multicasts on all ports. Because broadcast frames
are sent out all ports, a switch creates a single broadcast domain.
Router: every port at a router is broadcast
Switch: every port at a switch is broadcast
For
more examples about collision domain visit
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