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Ethernet (Medium Access Control Protocol)

Ethernet (Medium Access Control Protocol). A single shared comm. Line Used by all (each check if “free” or “busy”) Message is broadcasted to all Message has “destination address” and “message-body”. A. B. C. D. A. B. C. D. D. message. Not mine. Discard it….

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Ethernet (Medium Access Control Protocol)

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  1. Ethernet (Medium Access Control Protocol) • A single shared comm. Line • Used by all (each check if “free” or “busy”) • Message is broadcasted to all • Message has • “destination address” and “message-body” A B C D

  2. A B C D D message Not mine. Discard it… Ethernet Protocol (how it works) • Node A wants to send something to node D • Message’s “destination address” = D • Message is broadcasted to all… • Every Machine checks • If not mine, then discard; else process message; My message!! Process it…

  3. Ethernet Protocol (Collision) • What if shared line is busy when node B wants to send? • Eg: If node A is currently sending…. • Node B waits… and send after node A is done. • What if many nodes are waiting… • And simultaneously send when node A is done! A B C D

  4. Length of collision delay is randomly generated. So, different delays for different waiting nodes…. LAN How to Resolve Collisions !!

  5. LAN (MACP – details from text)

  6. LAN (MACP – details from text)

  7. LAN (MACP)

  8. Paths from B to F? What if node C is faulty? WAN Network….

  9. WAN

  10. WAN

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