physical structure of computer network ? what is difference between point to point and multipoint connection ?

 physical structure of computer network : 

 physical structures in data communications :

 

What is the physical structure of computer network ? 
 What are  network attributes ?
 What are the types of connection in the network ? 
1___Type of Connection : 
A network is two or more devices connected through links. 
What is A link ?
 is a communications pathway that transfers data from one device to another.
-  For communication to occur :
  • two devices must be connected in some way to the same link at the same time.
  • There are two possible types of connections:
1_ point-to-point Connection 
point-to-point Connection
2_ and multipoint Connection 
multipoint Connection
 what is difference between point to point and multipoint connection ?
What is a Point to Point Connection?
  • A point-to-point connection provides a dedicated link between two devices.
  • The entire capacity of the link is reserved for transmission between those two devices.
  •  Most point-to-point connections use an actual length of wire or cable to connect the two ends, but other options, such as microwave or satellite links, are also possible .
  • When we change television channels by infrared remote control,
  •  we are establishing a point-to-point connection between the remote control and the television’s control system.

What is a Multipoint Connection ? 
  • A multipoint (also called multidrop) connection is one in which more than two specific devices share a single link .
  • In a multipoint environment, the capacity of the channel is shared .
  • either spatially or temporally.
  • If several devices can use the link simultaneously,
  • it is a spatially shared connection.
  •  If users must take turns, it is a timeshared connection.


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