Which connection does the OSI model support in networking?

Discussion

• Prajakta Pandit   -Posted on 19 Oct 15
  
  - OSI model support both connectionless and connection-oriented services in networking.
  
  Connection-oriented Service :
  
  - The connection oriented services establish a dedicated connection.
  
  - The establishment of connection may take place on the physical level or logical level.
  
  - This type of connection establishment needs some kind of signaling and some form of resources reservation such as, bandwidth.
  
  - After the connection establishment, the actual data transfer will take place and after the exchange of data the connection is cleared or broken.
  
  - A connection oriented service is also called as 'reliable' network service.
  
  - The connection oriented services are reliable because there is a minimization of data loss and retransmission of lost bits is possible.
  
  - It is guaranteed that data will arrive in the same order.
  
  - Connection oriented services set up virtual links between end systems through a network.
  
  - Connectionless Service :
  
  - The connectionless service does not require a connection to be established in order to exchange data.
  
  - It used to transfer data at the transport layer (Layer 4) of the OSI model.
  
  - In connectionless services for exchanging data there is no need to reserve any resources.
  
  - Connectionless service cannot provide any service guarantee.
  
  - In connectionless service, the routing infrastructure can face bottleneck problem due to overloading.
  
  
  

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