Methods used in Packet switching

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• Prajakta Pandit   -Posted on 20 Oct 15
  
  - Packet switching is a digital networking communications method that groups all transmitted data into suitably sized blocks, called packets.
  
  - The packets are transmitted via a medium that may be shared by multiple simultaneous communication sessions.
  
  - Packet switching increases network efficiency, robustness and enables technological convergence of many applications operating on the same network.
  
  - There are two methods used in Packet switching :
  
      1. Datagram packet switching
      2. Virtual-circuit packet switching
  
  - In virtual-circuit packet switching a virtual circuit is made before actual data is transmitted. If an intermediate node fails in virtual-circuit, all virtual circuits that pass through it are lost.
  
  - The most common feature of virtual-circuit networks are X.25 and frame relay, which are commonly used for public data networks. (PDN).
  
  - In datagram packet switching, uses a different, more dynamic scheme, to determine the route through the network links. Each packet is treated as an independent entity and its header contains full information about the destination of the packet.
  
  - The intermediate node examine the header of the packet and decide to which node to send the packet so that it will reach its destination.
  
  

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