[AUDIO LOGO]
Congratulations on completing another skill.
Now, it's time for a review in the form of a quiz.
So let's go ahead and jump in with our first question.
Which of the following is a design goal
of BGP route dampening?
So let's go down our list and see which ones make sense.
So number 1 says to reduce router processing load caused
by large BGP tables.
Well, unfortunately, route dampening
isn't about large BGP tables, it's about routes flapping.
Now, a large BGP table may make that problem worse,
but that's not the fundamental problem
that route dampening is fixing.
So that would make 1 an incorrect answer.
Number 2, minimize eBGP update processing on the internet
by suppressing customer routes.
Well, we may suppress customer routes
as part of route dampening, but generally speaking, that's
not the idea.
We're going to go after routes that
are actually causing a problem.
So 2, in general, although again it
may be customer routes that get suppressed,
that's not our actual goal.
Next, suppress routes that are likely to flap
based on their history.
That's the one we're looking for.
We're looking for routes that are misbehaving,
that have already proven that they're being advertised
and then retracted and then advertised many times
in a short period of time.
And that also brings us to the last point
that we're not suppressing routes
that just flap occasionally.
It's going to be routes that have
a history of flapping again numerous times
in a short period of time.
So for this question, the answer is going to be number 3.
Next question, we have a fill in the blank.
What is BGP Prefix Independent Convergence or PIC?
Now, as always, with fill in the blank questions,
there's a couple of ways we could word this.
But as long as you get the general idea,
it's BGP storing a backup path in the BGP
table, the routing table, and the forwarding table.
The idea is it can be used immediately
in the event of a detected failure.
Again, this is very similar to what
OSPF does with fast reroute and what EIGRP does
with its feasible successor.
So that concludes this quiz.
If you find that you are missing any of the information
to answer these questions, I would
encourage you to go back and review the sources referenced
on the questions.
Otherwise, congratulations on completing Implementing BGP
Advanced Features.
I hope this has been informative for you,
and I'd like to thank you for viewing.