Exam JN0-664 topic 1 question 57 discussion

Actual exam question from Juniper's JN0-664

Question #: 57
Topic #: 1

You have an L2VPN connecting two CEs across a provider network. The CEs and provider network are configured with the default MTU setting. You use the ping command from one CE to the other CE with a size of 1500 bytes.
In this scenario, which statement is correct when using the ping command?

A. You expect an ICMP message too long error.
B. You expect an echo reply.
C. You expect a silent discard.
D. You expect the ping results to be fragmented.

Show Suggested Answer

Suggested Answer: C 🗳️

by bololbno at April 8, 2024, 8:24 a.m.

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mad_maran

8 months, 3 weeks ago

Answer is C

upvoted 2 times

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yaronas

8 months, 4 weeks ago

Selected Answer: C

answer is C

upvoted 4 times

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bololbno

9 months ago

answer is C. according to juniper documentation configuring L2VPN. Layer 2 VPNs don’t support fragmentation in the provider network. It is critical that the provider network supports the largest frame that the CE devices can generate after the MPLS and virtual routing and forwarding (VRF) labels are added by the PE devices. This example leaves the CE devices at the default 1500-byte maximum transmission unit (MTU) while configuring the provider core to support a 4000 byte MTU. This configuration avoids discards by ensuring the CE devices cannot exceed the MTU in the provider’s network.

upvoted 4 times

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