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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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Which prefixes will
be given an SR label?

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So let's go ahead and
work down our answers.

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Number one says all
loopback interfaces.

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And that's just not going
to be a correct answer

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because we don't create
SR labels for loopbacks

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automatically.

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Number two says all
prefixes learned

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by the routing protocol.

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That's actually more like
something LDP would do.

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We don't create prefixes for
all of the prefixes in segment

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routing.

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Number three, those with
a prefix SID configured.

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This one would be correct.

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This is a manual
process where we

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have to configure the
prefixes for the prefixes

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that we wish to have an
SR label assigned to.

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Four is sort of an
interesting answer.

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It says none.

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And that is actually
what prefixes

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will be given an SR label
if we don't configure any.

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So if three is not true,
then four would be true.

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So I would go ahead and mark
that as a correct answer.

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It will be either three or four.

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So we'll create a label
for those with a prefix SID

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or we will do none.

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So I would consider three and
four both correct answers here.

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Next question.

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When configuring IS-IS to
support segment routing,

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you do not need to configure
the actual protocol

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since it's already supported.

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Now if you remember when we were
going through configuration,

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we had to actually
configure segment

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routing MPLS under
the IS-IS process.

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So that would make
this statement false.

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It is not already supported.

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We do have to configure it.

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So here, false would
be the correct answer.

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Next question.

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Although LDP is no longer
required to exchange labels,

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it must remain enabled to
allow MPLS on the interfaces.

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Now we actually
had a whole video

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specifically on removing LDP.

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And everything still
worked after we did that.

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So the answer to this
question is clearly false.

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We do not have to have
LDP enabled for MPLS

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to function in the context
of segment routing.

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Final question.

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The data plane for
SR is just MPLS.

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For this question, the
answer is actually true.

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We're simply using SR
to exchange the labels

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and do a source-based routing
type scenario on top of MPLS.

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But the data plane itself
is going to stay MPLS.

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So that concludes this quiz.

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If you find 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 referenced sources

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on each question.

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Otherwise, congratulations on
completing implementing segment

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routing.

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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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