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Connection Oriented usually means some resources will be reserved or allocated to the nodes that are connected. They will keep track of bytes sent and received, acknowledgements etc. Usually it is reliable. e.g. TCP

Connection Less usually means just the opposite. No records are maintained at either end and the service is unreliable. It is like shoot and forget e.g. UDP

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connection oriented : get acknowledgement after delivery , and it is reliable'

connection less : no get any acknowlledgement , and not reliable

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