networkmanagement

                                     networks topologies
network topology= defines that structure of the network.
one part of the topology definition is the physical topology which is the actual layout of the wire or media.
the other part is the logical topology which defines how the media is accessed by the host for sending data.

                                        Bus topology
A bus topology use  a single backbone cable that is terminate at both ends all the host connect directly to this backbone.






star the topology
a star topology connections all cables to a central point of concertration



ring topology
a ring topology connects one host to the next and last host to the first.






                                      extended star topology
extended star topology links.