Logical Link Control Services
• MAC layer is best-effort. Additional features can
be introduced via LLC. IEEE 802.2 committee
defines three types of LLC
– Type 1: datagram protocol, best-effort
– Type 2: connection-oriented on basic datagram
• Sequence numbering, piggybacked acks, differentiate control
from data packets
• Connection-management as required in point-to-point links
E.g. PPP
– Type 3: semi-reliable protocol, provides
acknowledgements with connection-less service
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