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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 of the following are
used with RIP version 2

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to prevent routing loops?

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Now let's go down our list.

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The first thing we have
is the downward bit.

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The downward bit is actually
used for this purpose by OSPF.

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So it's not used by RIP.

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That would make this
an incorrect answer.

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2 is route maps.

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That sounds OK.

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Let's hold that for minute.

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Number 3 is poison reverse.

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Now, poison reverse
actually is used

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in RIP version 2 to
prevent routing loops

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within the protocol
itself, but not

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in the case of it being a CE-PE
and involved in redistribution.

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So in the context
of this skill, I

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would consider this to
be an incorrect answer.

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Next up is Site-of-Origin.

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This one is actually
used by EIGRP.

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And although we didn't mention
it specifically, if needed,

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this can be used with
BGP itself as well.

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We did see that it's carried
as a BGP extended community.

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However, neither of
those are RIP version 2.

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So for this question,
that's going

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to be an incorrect answer.

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So that, of course,
leaves the answer

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we said sounded OK to begin
with, which was route maps,

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route maps specifically
with using tags.

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So it's sort of a
specific implementation,

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but nonetheless that
makes 2 a correct answer.

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That's the one we used
in our demonstration.

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So for this question,
the correct answer

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is going to be number 2, route
maps using tags and filtering.

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Next question.

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What does AS override do?

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So this is a fill in
the blanks question.

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So as long as we're saying
something along these lines.

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What AS override does is it
replaces or, as the name says,

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overrides all copies of
the customer's AS number,

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and it replaces it with the
service provider's AS number.

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The main purpose
for this, of course,

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is this allows the
customer to use the same AS

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number at each--

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and you could even
say every site.

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So the customer can use the
same AS number everywhere,

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which is good because
the customer may only

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have one AS number
either assigned by us

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or maybe they have their
own public AS number.

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But either way, they may
and probably only have one.

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Next question.

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We have another fill
in the blanks question.

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What is the purpose of
this Site-of-Origin?

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So once again, we're looking
for something along these lines.

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The idea is it's
to prevent routes

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being learned from a site,
and then being sent back

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into the same site therefore
potentially creating a loop.

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So the idea is when the route
comes in from that site,

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we put the Site-of-Origin on it.

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You could almost look at
the Site-of-Origin a bit

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like a tag or tagging that
route with the site of origin,

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and then using that to
filter it from going back

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into the same site.

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So that concludes this quiz.

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If you feel that 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 reference

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sources on each question.

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Otherwise, congratulations
on completing

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implementing additional CE-PEs.

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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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