$11.$ Was there a pattern to the MAC addressing in the simulation?

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$12.$ Did the switches ever replicate a PDU that was rejected with a red $$X$?$

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$13.$ Every time that the PDU was sent between the $10$ network and the $172$ network, there was a point where the MAC addresses suddenly changed. Where did that occur?

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$14.$ Which device uses MAC addresses that start with $00$D$0$:BA$?$

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$15.$ What devices did the other MAC addresses belong to$?$

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$16.$ Did the sending and receiving IPv$4$ addresses change fields in any of the PDUs?

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$17.$ When you follow the reply to a ping, sometimes called a pong, do you see the sending and receiving IPv$4$ addresses switch?

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$18.$ What is the pattern to the IPv$4$ addressing used in this simulation?

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$19.$ Why do different IP networks need to be assigned to different ports of a router?

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$20.$ If this simulation was configured with IPv$6$ instead of IPv$4,$ what would be different?