Hi Victor!
Since others have adequately answered questions 2 & 3 I've only an answer to
your question #1.
If a question should show up on the CCNA test regarding subnets as defined
with ip subnet zero I think that the question will be clear enough to
understand what Cisco is asking of you. In other words, if you understand
what ip subnet-zero does when it's in use as opposed to what happens when
it's not in use, don't sweat it.
Cheers!
Mark Harris CCNA
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