OSI Model
Physical
Bits representation
Encoding
Wiring Standards
Physical Toplogy
Bandwidth
Multiplexing
Data
- control how devices access the medium:
CSMA/CD - Collision Recovery, CSMA/CA - Collision Avoidance, Token Ring-Collision Free
- host addressing (MAC addressing - Ethernet 802.3)
- Layer 2 Framing - encapsulating decapsulating packets into frames and back
- half-duplex retransmission and backoff functions
- append/check FCS frame check sequence, discard malformed frames, interframe gap
enforcement
- Logical Topology
- Data transmission
Logical Link Control
- flow control and multiplexing for the logical link: EtherType, 802.1Q VLAN tags
- provides services to the upper layers
Network
Logical Addr
Switching
Connection Services
Transport
TCP
UDP