Collision Domain

• Collision of data packets
• Can happen when receiving and sending happens at the same time
  • For example on hubs because there are half duplex
• Devices will wait random amount of time when to send new packets

Collisions on Wireless LAN

• Collisions usually only happens nowadays only on Wireless LAN
• On WiFi they using CSMA/CA für Collision avoidance
  • They send additional read-to-send (RTS) and clear-to-send (CTS) messages to check if they can send data

Collision avoidance / detection methods

CSMA/CD

• Carrier Sense Multiple Access/Collision Detect
• Stellt sicher das nur einer gleichzeitig Daten senden kann

CSMA/CA

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References