Juniper JN0-683 Exam - Topic 5 Question 22 Discussion

Actual exam question for Juniper's JN0-683 exam

Question #: 22
Topic #: 5

[All JN0-683 Questions]

A local VTEP has two ECMP paths to a remote VTEP

Which two statements are correct when load balancing is enabled in this scenario? (Choose two.)

AThe inner packet fields are not used in the hash for load balancing.

BThe destination port in the UDP header is used to load balance VXLAN traffic.

CThe source port in the UDP header is used to load balance VXLAN traffic.

DThe inner packet fields are used in the hash for load balancing.

Show Suggested Answer

Suggested Answer: C, D

Load Balancing in VXLAN:

VXLAN uses UDP encapsulation to transport Layer 2 frames over an IP network. For load balancing across Equal-Cost Multi-Path (ECMP) links, various fields in the packet can be used to ensure even distribution of traffic.

Key Load Balancing Fields:

C . The source port in the UDP header is used to load balance VXLAN traffic: This is correct. The source UDP port in the VXLAN packet is typically calculated based on a hash of the inner packet's fields. This makes the source port vary between packets, enabling effective load balancing across multiple paths.

D . The inner packet fields are used in the hash for load balancing: This is also correct. Fields such as the source and destination IP addresses, source and destination MAC addresses, and possibly even higher-layer protocol information from the inner packet can be used to generate the hash that determines the ECMP path.

Incorrect Statements:

A . The inner packet fields are not used in the hash for load balancing: This is incorrect as the inner packet fields are indeed critical for generating the hash used in load balancing.

B . The destination port in the UDP header is used to load balance VXLAN traffic: This is incorrect because the destination UDP port in VXLAN packets is typically fixed (e.g., port 4789 for VXLAN), and therefore cannot be used for effective load balancing.

Data Center Reference:

Effective load balancing in VXLAN is crucial for ensuring high throughput and avoiding congestion on specific links. By using a combination of the source UDP port and inner packet fields, the network can distribute traffic evenly across available paths.

by Rene at Jun 12, 2025, 12:12 PM

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Gerald

2 months ago

I thought the source port was more important, not the destination.

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Gary

2 months ago

D is a no-brainer, inner fields are key for hashing!

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Penney

3 months ago

I agree, B is also true!

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Francesco

3 months ago

Wait, are you sure about C? That seems off.

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Trinidad

3 months ago

A is definitely correct, inner fields aren't used.

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Deonna

3 months ago

I'm a bit confused about the UDP header details. I thought both source and destination ports could be relevant, but I need to double-check that.

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Herminia

4 months ago

I practiced a question similar to this, and I feel like the inner fields definitely play a role in the hashing process.

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Rosamond

4 months ago

I remember something about the UDP header being important for load balancing, but I can't recall if it's the source or destination port.

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Tina

4 months ago

I think the inner packet fields are actually used in the hash for load balancing, but I'm not completely sure.

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Mica

4 months ago

I remember learning that the destination port is used for load balancing, not the source port, so I'll go with option B.

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Lajuana

4 months ago

The source port in the UDP header is definitely used for load balancing VXLAN traffic, so I'll choose option C.

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Gertude

5 months ago

Hmm, I'm a bit confused about whether the inner or outer packet fields are used. I'll have to think this through carefully.

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Thaddeus

5 months ago

I'm pretty sure the inner packet fields are used for load balancing, so I'll choose option D.

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Destiny

7 months ago

Hold up, I've got this. A and C are the way to go. The inner packet fields are not used in the hash for load balancing, and the source port in the UDP header is used to load balance VXLAN traffic. Boom, mic drop!

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Leonora

6 months ago

User3: And the source port in the UDP header is used to load balance VXLAN traffic.

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Jeannine

7 months ago

User2: Yeah, the inner packet fields are not used in the hash for load balancing.

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Irving

7 months ago

User1: I think A and C are correct.

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Karan

7 months ago

B and D, for sure. The destination port in the UDP header is used to load balance VXLAN traffic, and the inner packet fields are used in the hash for load balancing. It's like a VXLAN dance party!

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Raul

7 months ago

I agree, and D is also correct because the inner packet fields are used in the hash for load balancing.

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Marshall

7 months ago

I think B is correct because the destination port in the UDP header is used for load balancing.

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Alethea

8 months ago

Hmm, I think C and D are the right answers. The source port in the UDP header is used to load balance VXLAN traffic, and the inner packet fields are used in the hash for load balancing. Nailed it!

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Shelton

7 months ago

Great job! C and D are indeed the correct choices for load balancing in this scenario.

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Cristal

7 months ago

Yes, the source port in the UDP header and the inner packet fields are used for load balancing.

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Genevive

7 months ago

I think you're right, C and D are the correct answers.

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Emiko

8 months ago

I'd go with B and D. The destination port in the UDP header is used to load balance VXLAN traffic, and the inner packet fields are used in the hash for load balancing. Easy peasy!

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Gianna

7 months ago

Yes, B and D are the right choices. The destination port and inner packet fields are important for load balancing in this scenario.

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Carin

8 months ago

I agree, B and D make sense. The destination port and inner packet fields play a role in load balancing.

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Theola

8 months ago

I think B and D are correct. The destination port in the UDP header is used for load balancing, and the inner packet fields are used in the hash.

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Pearlie

8 months ago

A and C are correct. The source port in the UDP header is used to load balance VXLAN traffic, while the inner packet fields are not used in the hash for load balancing.

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