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A customer requests that their Layer 2 Ethernet service be configured to forward frames up to 1514 bytes. The service provider is using MPLS encapsulation and RSVP-TE fast-reroute with facilities bypass on their redundant IP/MPLS network. What is the minimum MTU setting for the network ports?
Suggested Answer: C
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39 comments · newest first
RA
Ranee
11 months ago
I thought it would be higher with all that encapsulation!
LA
Larue
11 months ago
Nope, it's definitely 1514.
FA
Fabiola
11 months ago
Wait, isn't it 1528 with the MPLS overhead?
LO
Lottie
11 months ago
Totally agree, 1514 is the standard for Ethernet frames.
TY
Tyra
12 months ago
The minimum MTU should be 1514 bytes.
ED
Edelmira
12 months ago
I vaguely recall that the MTU needs to be larger than the maximum frame size to accommodate any additional headers, so maybe 1540 is the right choice?
MO
Mohammad
1 year ago
I feel like the answer might be 1536 bytes because that includes the Ethernet frame and some overhead, but I could be mixing it up with another topic.
ZI
Zita
1 year ago
I practiced a similar question where we had to consider the MTU for MPLS. I think it was something like 1528 bytes, but I'm not entirely sure.
LU
Luz
1 year ago
I remember that the standard Ethernet frame size is 1514 bytes, but I think we need to account for the MPLS overhead too.
LE
Lewis
1 year ago
I'm feeling pretty confident about this one. The key is understanding the MPLS encapsulation and how that affects the frame size. Once I've got that figured out, the rest should be straightforward.
RO
Ronny
1 year ago
I've got a strategy here. I'll start by calculating the maximum frame size with the MPLS overhead, then add any additional overhead from the RSVP-TE fast-reroute. That should give me the minimum MTU setting I need.
DO
Dolores
1 year ago
Hmm, I'm a bit confused on how the MPLS and RSVP-TE fast-reroute with facilities bypass impact the MTU. I'll need to review my notes on those technologies to make sure I understand the implications.
RE
Renea
1 year ago
Okay, let me see. The customer wants to forward frames up to 1514 bytes, and the provider is using MPLS. I think the answer has to do with the overhead added by the MPLS encapsulation.
DA
Daniel
1 year ago
This looks like a tricky one. I'll need to think through the MPLS encapsulation and RSVP-TE fast-reroute details to figure out the minimum MTU.
AL
Alpha
1 year ago
I'm pretty sure Arista uses the .swix extension for EOS extensions, so I'll go with option A.
CH
Chandra
1 year ago
This seems like a tricky one. I'm not super familiar with the Trusted sites setting, so I'll need to do a quick review of that before answering. Hopefully, I can figure out the right solution.
FA
Fannie
1 year ago
Power Automate is definitely the way to go here. It's the perfect tool for creating workflows that integrate with Microsoft 365 apps. I feel pretty good about this one.
PA
Page
1 year ago
I've got this! The key is that the pattern grants authorized external services direct access to internal services. So even though it hides internal services from unauthorized consumers, it does provide that direct access for authorized ones. The answer is True.
DO
Dong
1 year ago
E) 1560? What is this, the Autobahn? I'm not trying to set any land speed records here, just a reliable network.
EV
Eva
1 year ago
D) 1540, baby! That's the sweet spot for MPLS with all the bells and whistles. Anything less is just asking for trouble.
LO
Lovetta
1 year ago
A: Definitely, anything less could cause issues with the network.
FL
Floyd
1 year ago
B: Yeah, I agree. 1540 is the way to go for MPLS with all the features.
VA
Van
1 year ago
A: I think the minimum MTU setting should be 1540.
LA
Lavonne
2 years ago
C) 1536 seems like a good, safe choice. Why complicate things when you can just go with the classic Ethernet MTU?
BO
Bo
1 year ago
D: Agreed, let's go with 1536 for the network ports.
JO
Joanne
1 year ago
C: 1536 it is then, no need to complicate things.
HE
Hershel
1 year ago
B: Yeah, it's better to stick with the classic Ethernet MTU.
HY
Hyman
1 year ago
A: I agree, 1536 is a safe choice for the minimum MTU setting.
HE
Helga
2 years ago
B) 1528 sounds about right. Gotta account for that MPLS header, you know?
SH
Sharan
1 year ago
B) 1528
JA
Jarod
1 year ago
A) 1514
TW
Twana
2 years ago
A) 1514? Really? That's way too small for MPLS and fast-reroute. The right answer has got to be bigger.
TI
Tiffiny
1 year ago
E) 1560
HY
Hyun
1 year ago
D) 1540
RE
Reena
1 year ago
C) 1536
LY
Lyda
1 year ago
B) 1528
VI
Vilma
2 years ago
That makes sense, I see your point. I'll go with 1536 as well.
LA
Lajuana
2 years ago
I disagree, I believe it should be 1536 to accommodate the MPLS encapsulation.
VI
Vilma
2 years ago
I think the minimum MTU setting should be 1528.