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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 protocol carries the VPN
labels for MPLS Layer 3 VPN?

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So let's just go ahead
and go down our list here.

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First, we have RSVP.

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This is actually used
for traffic engineering

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but not for MPLS layer 3 VPN, so
that would make one incorrect.

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Two is LSR, which is
a Label Switch Router.

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That's actually not a protocol,
so two would be incorrect.

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PIM version 2 is
used for multicast,

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so this is certainly not going
to be used for Layer 3 VPN.

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That makes three incorrect.

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Number four is
multi-protocol BGP,

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and this is, in fact, the one
that is used for Layer 3 VPN,

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so four is correct.

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Number five, OSPF, is incorrect.

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OSPF doesn't carry labels,
at least not in this context.

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So that makes four
our correct answer.

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Next question, which of the
following routing protocols

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can be used for TE?

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Now the real trick
here is simply

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to remember that Traffic
Engineering requires

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a link-state routing
protocol because we

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have to be able to use secondary
circuits without creating

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a loop.

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That said, there are
only two link-state

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routing protocols,
IS-IS and OSPF.

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EIGRP and RIP version 2 are
both distance vector protocols.

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BGP is sort of a
distance vector protocol,

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although we generally call
it a path vector protocol.

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Either way, our correct
answers here are two and five.

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Final question.

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Name the four parts of the
MPLS header with the bit count.

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So first, we have
the label at 20 bits.

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This is followed
by the EXP bits.

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The EXP bits are, of
course, three bits.

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We then have the S-bit
or the bottom-of-stack.

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This is one bit.

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And finally, we have the TTL, or
the Time To Live at eight bits.

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And those are the four parts of
the MPLS header with their bit

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count.

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So that concludes this quiz.

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If you find that you were
missing any of the information

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to answer these
questions, I would

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encourage you to review
the sources listed

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on each question.

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Otherwise, congratulations
on completing Exploring MPLS.

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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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