A service provided as an alternative for attached devices using llc is option D: all of the above which are:
A. unacknowledged connectionless service
B. connection-mode service
C. acknowledged connectionless service
A sort of communication service that permits data to be transmitted between network endpoints is referred to as connectionless. The sending endpoint doesn't even attempt to make sure the receiver is available to accept the data, much less try to create a dedicated, end-to-end connection with it.
In a connectionless service, data is sent between two nodes without the sender first verifying that the recipient is available to receive it.
Therefore, Connectionless Service Without Acknowledgement (LLC 1): Unacknowledged Connectionless Service, as the name implies, is a service where data frames are exchanged or conveyed from source to destination machines without any acknowledgement and without a connection being created between the source and destination machines.
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