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CSMA/CD — Carrier Sense Multiple Access with Collision Detection

Coordinates access and detects collisions on shared half-duplex Ethernet.

Acronym study batch 6 · reviewed 2026-10-20

Why learn CSMA/CD — Carrier Sense Multiple Access with Collision Detection?

Coordinates access and detects collisions on shared half-duplex Ethernet.

Where it came from

Modern switched full-duplex Ethernet does not use collision detection for link access.

• Memory aid (a learning cue, not the expansion): Listen for the Carrier; if a Collision occurs, Detect and retry.

Build your understanding

Work through these exercises in order. Try the task before opening a reference.

1. Without looking, expand CSMA/CD: Carrier Sense Multiple Access with Collision Detection.
2. Recall this memory aid: Listen for the Carrier; if a Collision occurs, Detect and retry.
3. Explain the practical use: Coordinates access and detects collisions on shared half-duplex Ethernet.
4. Explain this distinction: Modern switched full-duplex Ethernet does not use collision detection for link access.
5. Identify CSMA/CD in a device specification, architecture diagram, or system inventory.

Documentation and sources

• IEEE 802 LAN/MAN standards (www.ieee802.org)
• IETF Internet standards (www.rfc-editor.org)

Catalog source: technology-maxxing. This page reproduces the existing catalog’s learning material and source links.