LeongHW, SoC, NUS (UIT2201: Networks) Page 1© Leong Hon Wai, 2003-2008 (MACP) Medium Access Control Protocol.

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Presentation transcript:

LeongHW, SoC, NUS (UIT2201: Networks) Page 1© Leong Hon Wai, (MACP) Medium Access Control Protocol

LeongHW, SoC, NUS (UIT2201: Networks) Page 2© Leong Hon Wai, (MACP) Medium Access Control Protocol

LeongHW, SoC, NUS (UIT2201: Networks) Page 3© Leong Hon Wai, 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” ABCD

LeongHW, SoC, NUS (UIT2201: Networks) Page 4© Leong Hon Wai, 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; ABCD My message!! Process it… Not mine. Discard it… Dmessage

LeongHW, SoC, NUS (UIT2201: Networks) Page 5© Leong Hon Wai, 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! ABCD

LeongHW, SoC, NUS (UIT2201: Networks) Page 6© Leong Hon Wai, Collision Resolution  Length of collision delay is randomly generated.  So, different delays for different waiting nodes…. How to Resolve Collisions !!

LeongHW, SoC, NUS (UIT2201: Networks) Page 7© Leong Hon Wai, [SG] Notes

LeongHW, SoC, NUS (UIT2201: Networks) Page 8© Leong Hon Wai, WAN Network….  Paths from B to F?  What if node C is faulty?

LeongHW, SoC, NUS (UIT2201: Networks) Page 9© Leong Hon Wai, WAN, LAN, Router combination (1)

LeongHW, SoC, NUS (UIT2201: Networks) Page 10© Leong Hon Wai, WAN, LAN, Router combination (2)