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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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So let's go ahead and jump
in with our first question.

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Which command will display the
IS-IS IPv4 prefix attributes?

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So let's go down our list.

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Show isis neighbor?

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Well, it will show you
what it sounds like,

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which is neighbors.

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But the neighbors,
of course, do not

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include the prefix attributes.

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Now, show isis rib, which,
of course, is focusing

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on the routing
information base, this one

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does, in fact, tell you
the prefix attributes,

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because it's giving you detailed
information on the prefixes.

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Now, show isis database would
sound like a tempting answer.

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However, although there may be
a detailed command on that that

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may show you the
attributes, show isis

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database itself does not.

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So this is actually going
to be an incorrect answer.

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And show ip route isis shows
you routing table information.

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And even if we were to ask
for details on the prefix,

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it's still just giving
us routing information.

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And the IS-IS prefix
attributes are not

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part of routing information.

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So that would actually make
answer four an incorrect answer

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as well.

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Therefore, the correct answer to
see the IPv4 prefix attributes

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is answer two, show isis rib.

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Next question, what is the
default router type in IS-IS?

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This answer is pretty much
just a matter of memorization.

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There's not really a point
in going down the list here.

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Hopefully, we remember
that when we did not

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set the IS type on the
router, it did, in fact,

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default to level 1-2.

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Therefore, three is
our correct answer.

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And of course, just for
clarity, there is no level 3.

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That's just not
even a valid answer.

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One and two are not correct.

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But four is not even valid.

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So of course, that
means three, level 1-2,

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is our correct answer.

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Final question,
what configuration

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will provide redundancy for
the backbone through an area?

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Now, this being
fill in the blank,

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there's several ways
you could answer this.

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The answer I chose
to put here is

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to configure the links
between those L1,

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L2 routers, which are generally
the area border routers,

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configure them as L1, L2 links.

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So don't just have L1
links between the edge

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routers in an IS-IS area.

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So that concludes this quiz.

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If you find you were 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 referenced

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on each question to fill in
those gaps in your knowledge.

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Otherwise, congratulations on
completing Implementing IS-IS.

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I hope this has been
informative for you,

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and I want to thank
you for viewing.

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