RAS Slide Title

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Ethernet 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

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Ethernet Protocol (how it works)
My message!! Process it

• Node A wants to send something to node D
• Messages destination address D
• Message is broadcasted to all
• Every Machine checks
• If not mine, then discard else process message

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Ethernet Protocol (Collision)

• What if 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!

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LAN
How to Resolve Collisions !!

• Length of collision delay is randonly generated.
• So, different for different waiting nodes.

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LAN
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WAN Network.

• Paths from B to F?
• What if node C is faulty?

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WAN
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WAN