Data Gram Services
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| A datagram service is just like a basic messaging service. Unlike the complete service that session management provides, datagram data transfer services operate more like mailing a letter. |
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| Datagram services are connectionless, no association exists between the sender and the receiver before the message is sent, thus, the status of the receiver is unknown. |
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| Datagrams are unreliable in that no acknowledgments are sent, and no guarantee is provided that a datagram will or had reached its recipient. |
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| Although a datagram can be addressed to a specific station, its main benefit is its ability to be sent to many stations simultaneously. |
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