Difference Between Connection-oriented and Connection-less Services

Connection-oriented service and Connection-less service both are used for the connection establishment between two or more than two devices. These types of services are offered by the network layer. Here this article gives information about the difference between Connection-oriented service and Connection-less service to better understand this topic.


Definition of  Connection-oriented service:

Connection-oriented service is similar to the telephone system, where parties use the handshake method to establish a connection between the sender and receiver. These services include connection establishment and connection termination.

Definition of Connection-less service:

Connectionless service is similar to a postal system where packets move from one party to another without establishing a connection first. These services do not include connection establishment and connection termination.

The main key difference between Connection-oriented service and Connection-less service are listed below:

  • In connection-oriented service, must be authentication is needed, while connectionless service does not need any authentication service.
  • Connection-oriented service is similar to the phone system, connection-less service is similar to the postal system.
  • There is a requirement for a prior connection for communication in connection-oriented services, while in connectionless services it is not needed.
  • The connection-oriented protocol makes a connection and it checks whether the message is received or not and sends the message again if some error occurs, while connectionless service protocol does not guarantee message delivery.
  • Traffic congestion is greater in connectionless services where it is occurrence is rare in connection-oriented service. uses circuit switching on the other hand packet switching us used in Connection-less service
  • Connection-oriented service
  • Connection-oriented service is appropriate for long and steady communication whereas connectionless service is fir for bursty transmission.
  • Connection-oriented services sender and receiver are synchronized with each other while is not a case of Connection-less service
  • Connection-oriented service is more reliable than connectionless service.
  • Connection-oriented service all packets follow the same path while the packets follow the random path to reach the destination in Connection-less service
  • The connection-oriented service interface is stream-based and connectionless is message based.
  • Bandwidth  is a requirement is higher in Connection-oriented service while it is low in Connection-less service
  • In connection-oriented services order of packet received at the destination is the same as sent from the source, while the order might change in connectionless services.
  • connection-oriented service is used in a long and study communication network, while the connection-less service is used to volatile networks.
  • No congestion in connection-oriented service, while the congestion is quite possible in connection-less service.

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