1
00:00:00,000 --> 00:00:03,297
[AUDIO LOGO]

2
00:00:03,297 --> 00:00:07,540

3
00:00:07,540 --> 00:00:11,360
Congratulations on
completing another skill.

4
00:00:11,360 --> 00:00:16,040
Now it's time for a review
in the form of a quiz.

5
00:00:16,040 --> 00:00:18,160
As we go through
these questions,

6
00:00:18,160 --> 00:00:22,720
be sure to pause the video after
each question to give yourself

7
00:00:22,720 --> 00:00:25,480
the opportunity to answer
the question yourself

8
00:00:25,480 --> 00:00:27,940
before we then go
over the answer.

9
00:00:27,940 --> 00:00:33,280
That said, let's jump in
with our first question.

10
00:00:33,280 --> 00:00:40,230
"Which command will disable PHP
for all prefixes on IOS XR?"

11
00:00:40,230 --> 00:00:46,360

12
00:00:46,360 --> 00:00:49,240
So as we look down
all of these answers,

13
00:00:49,240 --> 00:00:51,400
note that they're
all the same right

14
00:00:51,400 --> 00:00:53,720
up to the key word "label."

15
00:00:53,720 --> 00:00:57,290
So the real difference is going
to be what comes after this.

16
00:00:57,290 --> 00:01:00,130
And since we're talking
about disabling PHP,

17
00:01:00,130 --> 00:01:03,430
that would involve local labels.

18
00:01:03,430 --> 00:01:06,290
So that's going to leave
one of these three answers.

19
00:01:06,290 --> 00:01:08,380
And then what we want to
do is we're telling it

20
00:01:08,380 --> 00:01:10,780
what we want it to advertise.

21
00:01:10,780 --> 00:01:14,230
So that's going to bring us to
number three, which is actually

22
00:01:14,230 --> 00:01:16,360
going to be our
correct answer here.

23
00:01:16,360 --> 00:01:21,580
It's MPLS LDP
address-family IPv4 label

24
00:01:21,580 --> 00:01:25,550
local advertise explicit-null.

25
00:01:25,550 --> 00:01:28,300
So that makes number
three our correct answer.

26
00:01:28,300 --> 00:01:32,440
Next question, "What
is the purpose of using

27
00:01:32,440 --> 00:01:36,910
an 'export map' as opposed
to just adding an additional

28
00:01:36,910 --> 00:01:40,390
'route-target export'
command under the VRF?"

29
00:01:40,390 --> 00:01:46,620

30
00:01:46,620 --> 00:01:48,560
So this is a
fill-in-the-blank question,

31
00:01:48,560 --> 00:01:52,220
so as long as we're saying
something close to this--

32
00:01:52,220 --> 00:01:58,220
"It allows the route target to
be placed on specific prefixes

33
00:01:58,220 --> 00:02:00,980
where if we do that
"route-target export"

34
00:02:00,980 --> 00:02:05,610
command that's going to put
it on all the prefixes."

35
00:02:05,610 --> 00:02:08,630
So just to break it
down, the simple answer

36
00:02:08,630 --> 00:02:12,890
is, we use export map
for specific prefixes.

37
00:02:12,890 --> 00:02:17,660
Route-target export would
cover all the prefixes.

38
00:02:17,660 --> 00:02:21,290
Final question, "What
does the forwarded option

39
00:02:21,290 --> 00:02:26,000
do on the command to
disable TTL propagation?"

40
00:02:26,000 --> 00:02:31,570

41
00:02:31,570 --> 00:02:34,070
So once again, this is
a fill-in-the-blank,

42
00:02:34,070 --> 00:02:41,500
but essentially what it does is
it sets the TTL to 255 but only

43
00:02:41,500 --> 00:02:46,180
for traffic that's being
forwarded through the router,

44
00:02:46,180 --> 00:02:52,340
while leaving the default title
for locally generated traffic.

45
00:02:52,340 --> 00:02:54,430
Now, the reason I just
generically called it

46
00:02:54,430 --> 00:02:59,230
the default TTL is it does
depend on the application what

47
00:02:59,230 --> 00:03:01,870
it's going to set the TTL to.

48
00:03:01,870 --> 00:03:05,470
Traceroute, for example,
increases the TTL

49
00:03:05,470 --> 00:03:07,430
as it sends the packets out.

50
00:03:07,430 --> 00:03:10,000
So the TTL may be
variable, but the point

51
00:03:10,000 --> 00:03:14,770
is MPLS is not
controlling that TTL.

52
00:03:14,770 --> 00:03:16,970
So that concludes this quiz.

53
00:03:16,970 --> 00:03:19,390
If you feel that you
were unable to answer

54
00:03:19,390 --> 00:03:21,790
any of these questions,
I would encourage

55
00:03:21,790 --> 00:03:25,030
you to go back and review
the sources referenced

56
00:03:25,030 --> 00:03:26,690
on each question.

57
00:03:26,690 --> 00:03:31,840
Otherwise, congratulations on
completing implementing L3 VPN

58
00:03:31,840 --> 00:03:33,500
Advanced Features.

59
00:03:33,500 --> 00:03:35,710
I hope this has been
informative for you,

60
00:03:35,710 --> 00:03:38,820
and I'd like to thank
you for viewing.

61
00:03:38,820 --> 00:03:42,000