Question: What is a key difference in how the receipt of data is handled between acknowledged and unacknowledged LLC modes in the SNDC function?
Option 1: Data transmission order differs between the two modes.
Option 2: The size of N-PDUs varies between acknowledged and unacknowledged modes.
Option 3: Receipt confirmation at the LLC layer is provided for acknowledged mode but not for unacknowledged mode.
Option 4: QoS profile negotiation is only applicable in acknowledged mode.
Explanation: The correct answer highlights a fundamental distinction between acknowledged and unacknowledged LLC modes. In acknowledged mode, the receipt of data is confirmed at the LLC layer, ensuring reliability. Conversely, in unacknowledged mode, no such confirmation is provided, prioritizing efficiency over guaranteed delivery, significantly impacting how applications manage data integrity and loss recovery in telecom networks.