Ethernet (Medium Access Control Protocol)

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Presentation transcript:

Ethernet (Medium Access Control Protocol) B C D 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”

Ethernet Protocol (how it works) A B C D D message Not mine. Discard it… My message!! Process it… 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;

Ethernet Protocol (Collision) A B C D 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!

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

LAN (MACP – details from text)

LAN (MACP – details from text)

LAN (MACP)

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

WAN, LAN, Router combination (1)

WAN, LAN, Router combination (2)