[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 protocol carries the VPN labels for MPLS Layer 3 VPN?
So let's just go ahead and go down our list here.
First, we have RSVP.
This is actually used for traffic engineering
but not for MPLS layer 3 VPN, so that would make one incorrect.
Two is LSR, which is a Label Switch Router.
That's actually not a protocol, so two would be incorrect.
PIM version 2 is used for multicast,
so this is certainly not going to be used for Layer 3 VPN.
That makes three incorrect.
Number four is multi-protocol BGP,
and this is, in fact, the one that is used for Layer 3 VPN,
so four is correct.
Number five, OSPF, is incorrect.
OSPF doesn't carry labels, at least not in this context.
So that makes four our correct answer.
Next question, which of the following routing protocols
can be used for TE?
Now the real trick here is simply
to remember that Traffic Engineering requires
a link-state routing protocol because we
have to be able to use secondary circuits without creating
a loop.
That said, there are only two link-state
routing protocols, IS-IS and OSPF.
EIGRP and RIP version 2 are both distance vector protocols.
BGP is sort of a distance vector protocol,
although we generally call it a path vector protocol.
Either way, our correct answers here are two and five.
Final question.
Name the four parts of the MPLS header with the bit count.
So first, we have the label at 20 bits.
This is followed by the EXP bits.
The EXP bits are, of course, three bits.
We then have the S-bit or the bottom-of-stack.
This is one bit.
And finally, we have the TTL, or the Time To Live at eight bits.
And those are the four parts of the MPLS header with their bit
count.
So that concludes this quiz.
If you find that you were missing any of the information
to answer these questions, I would
encourage you to review the sources listed
on each question.
Otherwise, congratulations on completing Exploring MPLS.
I hope this has been informative for you,
and I'd like to thank you for viewing.