[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.
How many types of hello packets does IS-IS support?
So sort of the key here is we're actually
looking at types of packets, not just categories.
If you remember, we said that there's basically
two categories--
you have LAN and point-to-point.
But under LAN, the hellos are actually
separated into level one and level two,
point-to-point just uses one hello packet.
So when we're talking about types of packets,
well, we have one type, two types, and three types.
So this would make three our correct answer,
there are three types of hello packets
essentially in two different categories--
LAN versus point-to-point.
Next question.
Once the Designated Intermediate System or DIS is elected,
how is the Backup Intermediate System or the BIS elected?
So we could theoretically go through all of these answers.
However, hopefully, everybody remembers
that unlike OSPF, which of course does in fact use a PDR,
there is no Backup in IS-IS.
So there is no DIS.
Therefore, the correct answer here
is it's not elected because there is no such thing.
So of course, the fundamental principal
to take away from this question is there is no Backup.
If the DIS fails, we simply elect another one.
Final question.
On a broadcast network type, how often
will the DIS multicast the CSNP to the LAN?
So this is really just a matter of memorization.
And hopefully, you remembered that every 10 seconds, the DIS
multicast the CSNP to the other devices on that LAN segment.
So that concludes this quiz.
Hopefully, you were able to answer all of the questions.
If not, I would encourage you to go back and review
the sources referenced on each question
so that you can gain that missing knowledge.
Otherwise, congratulations on completing Explain IS-IS
Operations.
I hope this has been informative for you.
And I'd like to thank you for viewing.