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A customer requests that their Layer 2 Ethernet service be configured to forward frames up to 1500 bytes. The service provider is using MPLS encapsulation (without RSVP-TE fast-reroute) on their IP/MPLS network. What is the minimum MTU setting for the network ports?
Suggested Answer: B
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42 comments · newest first
EV
Eve
10 months ago
I thought it would be higher, like 1536.
CH
Chana
10 months ago
Totally agree, 1512 is the right choice here!
ME
Melvin
11 months ago
Wait, why not 1522? Seems off to me.
LO
Lon
11 months ago
1512 makes sense, but I’m surprised it’s not more!
LA
Lavelle
11 months ago
The minimum MTU should be 1512 bytes.
PE
Peggie
11 months ago
I thought the minimum MTU for MPLS was 1536 bytes, but I could be confusing it with another protocol. Need to double-check that!
OR
Oretha
11 months ago
If the customer wants to forward frames up to 1500 bytes, I feel like we need to add the overhead from MPLS. Is it 1522 bytes?
LU
Ludivina
12 months ago
I think we practiced a similar question where we had to calculate MTU for MPLS. I want to say it was around 1512 bytes, but I could be mixing it up.
RE
Rebbeca
12 months ago
I remember that the MTU needs to account for the Ethernet frame size plus the MPLS headers, but I'm not entirely sure about the exact number.
RO
Ronnie
1 year ago
Good point about the MPLS overhead. I think the key is understanding how that affects the maximum frame size the network needs to support.
HY
Hyman
1 year ago
I'm pretty confident the answer is B. The MPLS header adds 4 bytes, and the Ethernet frame can be up to 1500 bytes, so the minimum MTU should be 1522.
MA
Marget
1 year ago
Hmm, I'm a bit confused. Does the MPLS encapsulation add any overhead that we need to account for?
CA
Casey
1 year ago
Okay, let's think this through step-by-step. We need to consider the MPLS encapsulation and the customer's requirement for 1500-byte frames.
EV
Eva
1 year ago
Wow, this question is really making my head spin. Maybe I should have studied more about MPLS encapsulation before taking this exam. Or maybe I should have just asked the network admin to fill out the answer for me. *sigh*
HE
Helaine
1 year ago
Let's double-check the MTU setting with the network admin just to be safe.
FI
Filiberto
1 year ago
I believe it's D) 1542, but I could be wrong.
JO
Jovita
1 year ago
I'm not sure, but I think it's either A) 1512 or C) 1536.
MA
Margot
1 year ago
Don't worry, I think the answer is C) 1536.
EL
Ellen
1 year ago
I'm going to have to disagree with you all. The answer is A) 1512. Why? Because the customer specifically requested 1500-byte frames, and the MPLS header is already accounted for. Anything more would be overkill!
CA
Catherin
1 year ago
I'm going to have to disagree with you all. The answer is A) 1512. Why? Because the customer specifically requested 1500-byte frames, and the MPLS header is already accounted for. Anything more would be overkill!
EL
Elroy
1 year ago
D) 1542
MA
Martina
1 year ago
C) 1536
CE
Celestina
1 year ago
B) 1522
LO
Loren
1 year ago
A) 1512
AR
Arminda
1 year ago
This question is a piece of cake! The answer is clearly B) 1522. I mean, who doesn't know that the MPLS header adds 4 bytes to the frame size?
CA
Callie
1 year ago
D) 1542 is the correct answer. The MPLS header adds 4 bytes, and the service provider should account for an additional 38 bytes for the Ethernet header and trailer.
EL
Elvera
1 year ago
D) 1542 is the correct answer.
TA
Tayna
1 year ago
D) 1542
AR
Art
1 year ago
C) 1536
MA
Mable
1 year ago
B) 1522
CU
Curt
1 year ago
A) 1512
WI
Wilbert
2 years ago
Hmm, I'm gonna go with C) 1536. That should be enough to handle the MPLS encapsulation and the 1500-byte frames, right? Better safe than sorry!
JO
Joseph
1 year ago
User 4: Definitely, it's always good to be prepared for any potential issues.
ZO
Zoila
1 year ago
User 3: I agree, better to have a little extra room just in case.
CE
Cecil
1 year ago
User 2: Agreed, it's better to have a buffer in case of any unexpected overhead.
DE
Delpha
1 year ago
User 2: Yeah, that sounds like a safe bet.
JO
Joseph
1 year ago
User 1: I think C) 1536 is the right choice.
AL
Alaine
1 year ago
User 1: I think C) 1536 is the right choice too. It's always good to have a little extra room.
SH
Shalon
2 years ago
I agree with Earleen, 1522 makes more sense for the network ports with MPLS.
GE
Gearldine
2 years ago
I think the answer is B) 1522. The MPLS header adds 4 bytes to the Ethernet frame, and the customer wants to support frames up to 1500 bytes, so the minimum MTU needs to be 1522 bytes.
EA
Earleen
2 years ago
I disagree, I believe it should be 1522 because of the MPLS encapsulation.
MA
Marg
2 years ago
I think the minimum MTU setting should be 1536.