Class 3—Datagram service. The device drivers determine if data is not received and needs to be retransmitted.
Connectionless
Unacknowledged delivery
,D is correct
Class 3 Fibre Channel service is a connectionless service using frame switching, like Class 2. However unlike Class 2, Class 3 is designed around a datagram model and Fibre Channel doesn't check for missing or corrupted frames. Flow control and data integrity are handled by a higher-level protocol such as TCP (Transmission Control Protocol). However there is link-level flow control between the fabric and each connected device.
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