Point to Point Data Link Control
one sender, one receiver, one link: easier than broadcast link:
- no Media Access Control
- no need for explicit MAC addressing
- e.g., dialup link, ISDN line
popular point-to-point DLC protocols:
- PPP (point-to-point protocol)
- HDLC: High level data link control (Data link used to be considered “high layer” in protocol stack!