network topologies
network topologies is defines that structure of the network.
one part of the topology definition is the physical topology which is the actual lay out of the wire or media.
the other part is the logical topology which defines how the media is accesed by the host for sending data.
layer 3 transport
appliction
prisention
session
transport
nertwork
datalink
physical
type of transmission
unicast
multicast
broadcast
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