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In first question collision domain is 11.
But after consult from some books they make 15 collision domain but the right answer is 16 collision domain as a whole...

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Posted by HamidAliKhan

Answer of First Scenario:

Because Switch is being used and its separates collision domain that's why answer is 11.

Answer of 2nd Scenario:

In the second scenario we have one hub connected with 2Pcs and one router we have 4 collision domains.

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Posted by sagitraz

The answer of first part of the Q. is:
The Collision Domain is 11
And as a whole the answer is:
The Collision Domain is 16

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Posted by HamidAliKhan