[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 command will disable PHP for all prefixes on IOS XR?"
So as we look down all of these answers,
note that they're all the same right
up to the key word "label."
So the real difference is going to be what comes after this.
And since we're talking about disabling PHP,
that would involve local labels.
So that's going to leave one of these three answers.
And then what we want to do is we're telling it
what we want it to advertise.
So that's going to bring us to number three, which is actually
going to be our correct answer here.
It's MPLS LDP address-family IPv4 label
local advertise explicit-null.
So that makes number three our correct answer.
Next question, "What is the purpose of using
an 'export map' as opposed to just adding an additional
'route-target export' command under the VRF?"
So this is a fill-in-the-blank question,
so as long as we're saying something close to this--
"It allows the route target to be placed on specific prefixes
where if we do that "route-target export"
command that's going to put it on all the prefixes."
So just to break it down, the simple answer
is, we use export map for specific prefixes.
Route-target export would cover all the prefixes.
Final question, "What does the forwarded option
do on the command to disable TTL propagation?"
So once again, this is a fill-in-the-blank,
but essentially what it does is it sets the TTL to 255 but only
for traffic that's being forwarded through the router,
while leaving the default title for locally generated traffic.
Now, the reason I just generically called it
the default TTL is it does depend on the application what
it's going to set the TTL to.
Traceroute, for example, increases the TTL
as it sends the packets out.
So the TTL may be variable, but the point
is MPLS is not controlling that TTL.
So that concludes this quiz.
If you feel that you were unable to answer
any of these questions, I would encourage
you to go back and review the sources referenced
on each question.
Otherwise, congratulations on completing implementing L3 VPN
Advanced Features.
I hope this has been informative for you,
and I'd like to thank you for viewing.