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Exam JN0-361 topic 1 question 28 discussion

Actual exam question from Juniper's JN0-361
Question #: 28
Topic #: 1
[All JN0-361 Questions]

Click the Exhibit.


Referring to the exhibit, the GRE tunnel between R-1 and R2 allows connectivity between User-1 and Server-1. User-1 can communicate with Server-1 with packets that are up to 1448 bytes in size.
However, if the packet size is larger than 1448, User-1 cannot communicate with Server-1.
In this scenario, how do you solve the communication problem?

  • A. Change the physical MTU on the ge-0/0/3 interfaces on R-1 and R-2 to 1448 bytes.
  • B. Change the physical MTU on the gr-0/0/0 interfaces on R-1 and R-2 to 1448 bytes.
  • C. Apply the allow-fragmentation statement to the GRE tunnel configuration.
  • D. Apply the path-mtu-discovery statement to the GRE tunnel configuration.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by MA at Aug. 11, 2019, 8:55 p.m.

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MA
Highly Voted 5 years, 8 months ago
By default, the GRE-encapsulated packets are dropped if the packet size exceeds the MTU setting of the egress interface. Use the allow-fragmentation option to enable fragmentation of GRE-encapsulated packets regardless of MTU value.
upvoted 6 times
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lmukwaya
Most Recent 2 years, 3 months ago
C is the correct answer. By default, path MTU discovery on outgoing GRE tunnel connections is enabled. https://www.juniper.net/documentation/us/en/software/junos/transport-ip/topics/topic-map/pmtu-discovery-configure.html
upvoted 1 times
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Benxi
4 years, 7 months ago
It should be C. You can enable PMTUD but under system internet-options
upvoted 1 times
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mike95
4 years, 8 months ago
Agreed that both options would work but PMTU is the better choice as Fragmentation is not desirable
upvoted 1 times
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networkingcontrol
5 years, 4 months ago
It seems better answer D, Path-mtu discovery is disabled by default on GRE tunnels but can be enabled and dynamically will calculate the max size in order to prevent the fragmentation,.
upvoted 2 times
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