The PowerPoint
Slide 8
- Node – The computers
- In practice every networking device has a computer inside it
- Link – The connections
- In WiFi, Bluetooth, and microwave this will not be wires
- Point-to-point
- A direct connection between two nodes
- Though it may be tunneled
- How the UNC Asheville campus is connected to the Internet
- Try
mtr www.math.ucla.edu
- Multiple-access
- A shared channel
- Ethernet or WiFi
Slide 9
- Unicast – connection to a single computer
- Downloading a web page
- Multicast – transmitting to multiple computers sharing a special address
- Could be used in conferencing or network management
- Would not be used in real-time media
- Broadcast – transmitting to all computers on a local network
- Considered antisocial
Slide 20
Slide 24
Often the data link layer is considered as having two sub-layers: the upper logical link control (LLC) and the lower medium access control (MAC).
Many devices have unique MAC addresses.