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[AUDIO LOGO]

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Congratulations on
completing another skill.

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Now, it's time for a review
in the form of a quiz.

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As we go through
these questions,

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be sure to pause the video after
each question to give yourself

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the opportunity to answer
the question yourself

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before we then go
over the answer.

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That said, let's jump in
with our first question.

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What of the two primary
operational modes of PIM?

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So this one is just a
matter of memorization.

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Fast mode, push mode,
quick mode, pull mode,

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these are all just
made up terms.

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The correct answers are
sparse mode and dense mode.

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Making three and five
our correct answers

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for this question.

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Next question, which
group range is used

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for network control protocols?

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So remember that these
are also referred

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to as link local addresses.

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And the important
thing to remember,

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since all of these have the
same, address 224.10.0.0.0,

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the important thing to remember
is going to be the subnet mask

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here.

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And it's not a /32 because
that would basically be a host

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address.

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And that only give
us one address.

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Neither is it an 8 or a 16.

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That means our correct
answer is the /24.

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Making three our correct answer
for the link local or network

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control protocol
multicast group.

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Final question, which
of the following

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is the most widely implemented
multicast routing protocol?

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So of course, the key here is
the most widely implemented.

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These are all multicast
routing protocols.

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So let's just go down our list.

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First, we have PIM,
which would be correct.

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Except, it's PIM dense mode.

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And it is part of PIM.

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However, dense mode is not
the most widely implemented.

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Next is DVMRP.

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This is the one
that's based on RIP.

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And again, not very
popular at all.

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Next is PIM sparse mode.

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Sounds like a good
answer, but let's look

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at the rest of these.

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Number four is
multicast OSPF or MOSPF.

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Again, not even supported
on most platforms.

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And finally is CBT
or core-based tree.

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A predecessor to PIM but
not widely implemented.

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That would make three,
PIM sparse mode,

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our correct answer.

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And that concludes this quiz.

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If you feel you are missing
any of the information needed

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to answer these
questions, I would

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encourage you to go back and
review the sources listed

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on each question.

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Otherwise, congratulations
on completing discovering IP

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multicast.

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I hope this has been
informative for you.

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And I'd like to thank
you for viewing.

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