Data Link Layer (Layer 2, L2). 염익준. Cables. Used to connect nodes in the same room or building. Leased Lines. Used to connect site to site. Last-Mile Links. POTS (Plain Old Telephone Service): 56 Kbps ISDN (Integrated Services Digital Network): 64-128 Kbps
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*baud rate: the rate at which the signal changes
Trying to keep the pipe full.
Sequence number is needed to identify packets. (be careful not to be wrapped up)
Date Link Layer
Data Link Layer
Logical Link Layer (802.2)
Interface with upper layer,
framing, error control
MAC Layer (802.11)
A Super Frame