[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 of the following are used with RIP version 2
to prevent routing loops?
Now let's go down our list.
The first thing we have is the downward bit.
The downward bit is actually used for this purpose by OSPF.
So it's not used by RIP.
That would make this an incorrect answer.
2 is route maps.
That sounds OK.
Let's hold that for minute.
Number 3 is poison reverse.
Now, poison reverse actually is used
in RIP version 2 to prevent routing loops
within the protocol itself, but not
in the case of it being a CE-PE and involved in redistribution.
So in the context of this skill, I
would consider this to be an incorrect answer.
Next up is Site-of-Origin.
This one is actually used by EIGRP.
And although we didn't mention it specifically, if needed,
this can be used with BGP itself as well.
We did see that it's carried as a BGP extended community.
However, neither of those are RIP version 2.
So for this question, that's going
to be an incorrect answer.
So that, of course, leaves the answer
we said sounded OK to begin with, which was route maps,
route maps specifically with using tags.
So it's sort of a specific implementation,
but nonetheless that makes 2 a correct answer.
That's the one we used in our demonstration.
So for this question, the correct answer
is going to be number 2, route maps using tags and filtering.
Next question.
What does AS override do?
So this is a fill in the blanks question.
So as long as we're saying something along these lines.
What AS override does is it replaces or, as the name says,
overrides all copies of the customer's AS number,
and it replaces it with the service provider's AS number.
The main purpose for this, of course,
is this allows the customer to use the same AS
number at each--
and you could even say every site.
So the customer can use the same AS number everywhere,
which is good because the customer may only
have one AS number either assigned by us
or maybe they have their own public AS number.
But either way, they may and probably only have one.
Next question.
We have another fill in the blanks question.
What is the purpose of this Site-of-Origin?
So once again, we're looking for something along these lines.
The idea is it's to prevent routes
being learned from a site, and then being sent back
into the same site therefore potentially creating a loop.
So the idea is when the route comes in from that site,
we put the Site-of-Origin on it.
You could almost look at the Site-of-Origin a bit
like a tag or tagging that route with the site of origin,
and then using that to filter it from going back
into the same site.
So that concludes this quiz.
If you feel that you are missing any of the information needed
to answer these questions, I would
encourage you to go back and review the reference
sources on each question.
Otherwise, congratulations on completing
implementing additional CE-PEs.
I hope this has been informative for you,
and I'd like to thank you for viewing.