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Exam 4A0-105 topic 3 question 48 discussion

Actual exam question from Nokia's 4A0-105
Question #: 48
Topic #: 3
[All 4A0-105 Questions]

A network port using null encapsulation has an MTU of 1514 bytes. When MPLS transport is used without FRR, what is the maximum service MTU of a VPLS using that port?

  • A. 1536
  • B. 1514
  • C. 1496
  • D. 1492
  • E. 1488
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Suggested Answer: B 🗳️
by Ranx01 at May 7, 2025, 5:12 p.m.

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Ranx01
1 month, 1 week ago
Selected Answer: D
I think the answer to this is "D. 1492" - MPLS adds 22 bytes to the transport tunnel, hence subtract 22 bytes from the network port MTU of 1514 (1514 - 22 = 1492). 1492 will be the maximum service MTU for a VPLS using the port.
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