Media Access Control Protocols and Error Control
On a shared Wi-Fi channel, who gets to talk next — and what happens when two devices speak at once?
What this unit covers
Unit 6: The Data Link Layer, Addressing and Network Security
- 1 Sublayers of the Data Link Layer: LLC and MACOne layer, two halves: the LLC keeps each hop tidy while the MAC decides who may touch the wire. · 3 min
- 2 Media Access Control Protocols and Error ControlOn a shared Wi-Fi channel, who gets to talk next — and what happens when two devices speak at once? · 9 min
- 3 Levels of Addressing: Physical, Logical, Port and Specific AddressesYour message needs four names at once — for the next hop, the final machine, the right program and you. · 9 min
- 4 Using MAC Addresses to Protect a Private NetworkEvery frame carries its sender's MAC address — so the address itself can become a lock on the door. · 6 min
- 5 Aspects of Network SecurityThe pillars of network security: six guarantees every secure network has to keep, and the tools that keep them. · 4 min