Networks

Networks

MAC : medium access control
PAN: personal area network
WAN: wide area network
LAN: local area network
MAN: metropolitan area network - across a town

Network typologies

a physical topology is the physical arrangement of nodes/end points/hosts/clients/devices in a network, a logical topology defines how the devices communicate across the physical topology
  • A network wired in star topology can behave logically as a bus network by using a bus protocol and appropriate physical switching (though you probably should not do this)

Switch vs hub

  • Switch: faster, more reliable, and more secure data, uses "access tables" to isolate each connected nodes location
  • Hub: connected nodes are not isolated, so all traffic goes to all nodes, slower, less secure and less reliable

STAR vs MESH

star: all nodes connected to a central node, usually a switch, these are fast, reliable and cheaper, with good security, however have one critical point a failure, meaning if the switch breaks, the network goes down. also the central point has to be powerful

Mesh: all nodes are connected to all other nodes, these are very secure, fast and reliable, however, these are very expensive to set up as each new node requires (n-1) connection

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