LLC and Mac

Llc

1. Logical link control layer is upper subleases of data link layer.
2. Provide multiplexing
3. Provide flow control and error management contribute like ARQ Automatically repeat request.
4. The LLC sublayer acts as an interface between the media access control (MAC) sublayer and the network layer .

•  The LLC sublayer follows the IEEE 802.2 Where's in network like 802.11 Mac layer controls the error and flow control. Like Csma/ca
• PPP can be considered as LLC protocols.
•  

Mac ( Media access control)

1. Sublayer of 2 layer
2. Control the addressing and channel access control.
3. Provide communication between shared network like ethernet
4. Acts as interface between llc and physical layer.

This channel may provide unicast , multicast or broadcast communication service.


Examples of common statistical time division multiplexing multiple access protocols for wired multi-
drop networks are:

• CSMA/CD (used in Ethernet and
• IEEE 802.3)
• Token bus (IEEE 802.4 )
• Token ring ( IEEE 802.5 )
• Token passing (used in FDDI)

Examples of common multiple access protocols that may be used

• CSMA/CA (used in IEEE 802.11 /
• WiFi WLANs )
• Slotted ALOHA
• Dynamic TDMA
• Reservation ALOHA (R-ALOHA)
• Mobile Slotted Aloha (MS-
• ALOHA)
• CDMA
• OFDMAs