[AUDIO LOGO]
Congratulations on completing another skill.
Now it's time for a review in the form of a quiz.
As we go through these questions,
be sure to pause the video after each question to give yourself
the opportunity to answer the question yourself
before we then go over the answer.
That said, let's jump in with our first question.
Which prefixes will be given an SR label?
So let's go ahead and work down our answers.
Number one says all loopback interfaces.
And that's just not going to be a correct answer
because we don't create SR labels for loopbacks
automatically.
Number two says all prefixes learned
by the routing protocol.
That's actually more like something LDP would do.
We don't create prefixes for all of the prefixes in segment
routing.
Number three, those with a prefix SID configured.
This one would be correct.
This is a manual process where we
have to configure the prefixes for the prefixes
that we wish to have an SR label assigned to.
Four is sort of an interesting answer.
It says none.
And that is actually what prefixes
will be given an SR label if we don't configure any.
So if three is not true, then four would be true.
So I would go ahead and mark that as a correct answer.
It will be either three or four.
So we'll create a label for those with a prefix SID
or we will do none.
So I would consider three and four both correct answers here.
Next question.
When configuring IS-IS to support segment routing,
you do not need to configure the actual protocol
since it's already supported.
Now if you remember when we were going through configuration,
we had to actually configure segment
routing MPLS under the IS-IS process.
So that would make this statement false.
It is not already supported.
We do have to configure it.
So here, false would be the correct answer.
Next question.
Although LDP is no longer required to exchange labels,
it must remain enabled to allow MPLS on the interfaces.
Now we actually had a whole video
specifically on removing LDP.
And everything still worked after we did that.
So the answer to this question is clearly false.
We do not have to have LDP enabled for MPLS
to function in the context of segment routing.
Final question.
The data plane for SR is just MPLS.
For this question, the answer is actually true.
We're simply using SR to exchange the labels
and do a source-based routing type scenario on top of MPLS.
But the data plane itself is going to stay MPLS.
So that concludes this quiz.
If you find you are missing any of the information needed
to answer these questions, I would
encourage you to go back and review the referenced sources
on each question.
Otherwise, congratulations on completing implementing segment
routing.
I hope this has been informative for you,
and I'd like to thank you for viewing.