Ethernet medium access control protocol
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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
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


Ethernet protocol how it works

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…


Ethernet protocol collision
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


Length of collision delay is randomly generated.

So, different delays for different waiting nodes….

LAN

How to Resolve Collisions !!





Wan network

Paths from B to F?

What if node C is faulty?

WAN Network….




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