Data Link Protocols
Data Links Services
Framing
Error control
Flow control
Multiplexing
Link Maintenance
Security: Authentication &E
ncryption
Examples
PPP
HDLC
Ethernet LAN
IEEE 802.11 (Wi Fi) LAN
Directly connected, wire-like
Losses & errors, but no out-of-sequence
frames
Applications: Direct Links; LANs;
Connections across WANs
