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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 of the following
Ethernet fields

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are removed in layer 2 VPN?

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

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Number one is the
source MAC address.

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We're not going to be removing
MAC addresses from the Ethernet

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frame.

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However, number two is preamble.

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The preamble will get removed
because it's not necessary.

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It'll be re-created
on the other side.

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Same with number
three, the start

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of frame delimiter,
which, by the way,

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is actually part
of the preamble.

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But they are listed
as two separate parts.

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So we'll say that both
of those are correct.

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Once again, number four,
destination MAC address,

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we're not removing MAC
addresses from the header--

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source or destination.

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However, we do remove
the frame check sequence.

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And we simply generate a
new one on the egress side.

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So our correct answers here
are two, three, and five.

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Next question, which
of the following

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is recommended to
better scale VPLS?

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And why?

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So this is a combination
of select an answer

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and fill in the blank.

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So let's start with
the select an answer.

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Number one, router,
this is going

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to be the preferred choice.

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Now, there may be reasons
why the customer needs

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to use a switch.

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Just as an example,
if they're trying

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to extend a data center
between two physical locations,

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well, then they need layer
2 between the actual hosts

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themselves on both sides,
in which case, they're

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going to need to use a switch.

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But if they can
use a router, that

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would be a more
recommended solution.

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And the reason for that is
because using the router

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actually prevents
all the MAC addresses

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from having to be
on the PE routers.

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So it gives us a lot more
scalability on the PE routers.

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So recommended would be a
router for the reason given.

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Final question, what is
the primary difference

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between E-Line and E-LAN?

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So the real difference
here, of course, is E-LAN

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is multipoint acting
like a switch,

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where E-Line is point to point.

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And it acts like a
traditional WAN circuit.

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So the primary
difference, of course,

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is the whole multipoint
versus point to point.

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So that concludes this quiz.

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If you find that you are missing
any of the information needed

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to answer these
questions, I would

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encourage you to go back and
review the sources listed

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on each question.

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Otherwise, congratulations
on completing

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Discovering and Implementing
MPLS Layer 2 VPNs.

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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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