[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 of the following Ethernet fields
are removed in layer 2 VPN?
So let's go ahead and go down our list.
Number one is the source MAC address.
We're not going to be removing MAC addresses from the Ethernet
frame.
However, number two is preamble.
The preamble will get removed because it's not necessary.
It'll be re-created on the other side.
Same with number three, the start
of frame delimiter, which, by the way,
is actually part of the preamble.
But they are listed as two separate parts.
So we'll say that both of those are correct.
Once again, number four, destination MAC address,
we're not removing MAC addresses from the header--
source or destination.
However, we do remove the frame check sequence.
And we simply generate a new one on the egress side.
So our correct answers here are two, three, and five.
Next question, which of the following
is recommended to better scale VPLS?
And why?
So this is a combination of select an answer
and fill in the blank.
So let's start with the select an answer.
Number one, router, this is going
to be the preferred choice.
Now, there may be reasons why the customer needs
to use a switch.
Just as an example, if they're trying
to extend a data center between two physical locations,
well, then they need layer 2 between the actual hosts
themselves on both sides, in which case, they're
going to need to use a switch.
But if they can use a router, that
would be a more recommended solution.
And the reason for that is because using the router
actually prevents all the MAC addresses
from having to be on the PE routers.
So it gives us a lot more scalability on the PE routers.
So recommended would be a router for the reason given.
Final question, what is the primary difference
between E-Line and E-LAN?
So the real difference here, of course, is E-LAN
is multipoint acting like a switch,
where E-Line is point to point.
And it acts like a traditional WAN circuit.
So the primary difference, of course,
is the whole multipoint versus point to point.
So that concludes this quiz.
If you find that you are missing any of the information needed
to answer these questions, I would
encourage you to go back and review the sources listed
on each question.
Otherwise, congratulations on completing
Discovering and Implementing MPLS Layer 2 VPNs.
I hope this has been informative for you,
and I'd like to thank you for viewing.