1. 802 Layering 802 Committee Subdivided the Data Link Layer OSI 802
Media access control (MAC) layer
Logical link control (LLC) layer
OSI
802
Data Link
LLC
MAC
PHY
PHY

2. 802 Layering Media Access Control (MAC) Layer
Only one station may transmit at a time or signals will be scrambled
MAC layer standards ensure that only one can transmit (access the medium) at a time
Also defines the lowest-layer frame format

3. 802.2 Logical Link Control Layer Standard
802 Layering
Logical Link Control (LLC) Layer
Adds optional error correction (rarely used)
Connects to next-higher-layer (internet)
Single LLC standard for all LANs: 802.2 IP
IPX
Etc.
802.2 Logical Link Control Layer Standard
802.3
802.5
802.11

4. Higher Layers With OSI LAN standards, six-layer model
Hybrid TCP/IP-IEEE framework
Application
Transport
Internet
Logical Link Control
Media Access Control
Physical
Client and server must use same standard for each layer