Discuss Fortinet NSE5_SSE_AD-7.6 Exam Topic 5 Question 3

Refer to the exhibit, which shows the SD-WAN rule status and configuration.

Based on the exhibit, which change in the measured packet loss will make HUB1-VPN3 the new preferred member? (Choose one answer)

AWhen all three members have the same packet loss

BWhen HUB1-VPN1 has 4% packet loss

CWhen HUB1-VPN1 has 12% packet loss

DWhen HUB1-VPN3 has 4% packet loss

Suggested Answer: A

According to the SD-WAN 7.6 Core Administrator study guide and the FortiOS 7.6 Administration Guide, the selection process for the Best Quality (priority) strategy depends on two primary factors: the measured link quality metric and the configured member priority order.

Based on the provided exhibit (image_b40dfc.png), we can determine the following:

Strategy and Metric: The rule is in Mode(priority) (Best Quality) using link-cost-factor(packet loss).

Strict Comparison: The link-cost-threshold is set to 0. This means there is no 'advantage' given to the current preferred link; the FortiGate performs a strict comparison where the link with the objectively best metric is chosen.

Tie-Breaker Logic: When multiple links have the same packet loss, the FortiGate uses the Member Priority Order defined in the rule (set priority-members 6 4 5) as the tie-breaker.

Member 6 (HUB1-VPN3) is the highest priority.

Member 4 (HUB1-VPN1) is the second priority.

Member 5 (HUB1-VPN2) is the lowest priority.

Current State: HUB1-VPN1 is currently selected because its packet loss (2.000%) is lower than HUB1-VPN2 (4.000%) and HUB1-VPN3 (12.000%). Even though HUB1-VPN3 has a higher configuration priority, its significantly higher packet loss prevents it from being chosen.

Evaluation of Options:

Option A (Verified): If all three members have the same packet loss (e.g., they all show 2%), the quality metrics are equal. The SD-WAN engine then refers to the priority-members list. Since HUB1-VPN3 (Seq 6) is the first member in that list, it will immediately become the new preferred member.

Option B: If HUB1-VPN1 reaches 4%, it matches HUB1-VPN2 (4%). HUB1-VPN3 remains at 12%. The system will choose between VPN1 and VPN2. Since VPN1 (Seq 4) is higher in the priority list than VPN2 (Seq 5), HUB1-VPN1 stays preferred.

Option C: If HUB1-VPN1 reaches 12%, it matches HUB1-VPN3. However, HUB1-VPN2 is still better at 4.000%. Therefore, HUB1-VPN2 would become the new preferred member, not HUB1-VPN3.

Option D: If HUB1-VPN3 drops to 4%, it matches HUB1-VPN2. However, HUB1-VPN1 is still the best link at 2.000%, so it remains selected.

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26 comments · newest first

Veronica 3 months ago

B could work, but 4% for HUB1-VPN3 is better overall.

Carmen 3 months ago

C seems risky. 12% is too high for a preferred member.

Anisha 3 months ago

I agree, but what if A happens? Same loss for all.

Tashia 4 months ago

I think it's D. Lower packet loss is key.

Teddy 5 months ago

Just a fact, HUB1-VPN3 needs to be the lowest to be preferred.

Letha 5 months ago

A is interesting too, but I lean towards D.

Chantay 5 months ago

Wait, are we sure about that? What if HUB1-VPN1 changes?

Laurel 6 months ago

Totally agree, D makes the most sense!

Kindra 6 months ago

I think it’s D, HUB1-VPN3 needs lower packet loss.

Adelle 6 months ago

Haha, this question is a piece of cake! D is the obvious answer.

Lisbeth 6 months ago

D for sure. The question is asking what change will make HUB1-VPN3 the new preferred member, and that's when it has the lowest packet loss.

Rosenda 6 months ago

D is the correct answer. The exhibit shows that HUB1-VPN3 is the preferred member when its packet loss is lower than the other two.

Sue 6 months ago

I'm pretty sure the answer is D, when HUB1-VPN3 has 4% packet loss.

Chanel 7 months ago

Option D seems the most logical choice here.

Daniela 7 months ago

I vaguely recall that if all members have the same packet loss, it might not change the preferred member. So, option A could be a trick answer.

Glen 7 months ago

If I remember correctly, HUB1-VPN3 needs to have the lowest packet loss compared to the others to become preferred. I think option D sounds right, but I’m not entirely confident.

Marica 8 months ago

I think we practiced a similar question where the preferred member switched based on packet loss thresholds. I feel like lower packet loss makes a member preferred, but I can't recall the exact numbers.

Kaitlyn 8 months ago

I remember something about how packet loss affects the preferred member, but I'm not sure if it’s about the absolute values or the relative comparison.

Boris 8 months ago

Ah, I see. The key is to understand how the SD-WAN rule selects the preferred member based on the packet loss values. I'll need to carefully analyze the options and the exhibit to determine the correct answer.

Josefa 8 months ago

This seems straightforward. I think the answer is D) When HUB1-VPN3 has 4% packet loss, since that would make it the member with the lowest packet loss.

Grover 8 months ago

I'm a bit confused by the options. I'll need to double-check the SD-WAN rule logic to figure out which packet loss change would result in HUB1-VPN3 becoming the preferred member.

Mari 9 months ago

Okay, let me think this through. The exhibit shows the current SD-WAN rule status, so I'll need to understand how the preferred member is selected based on the packet loss values.

Colette 9 months ago

Hmm, this looks like a tricky one. I'll need to carefully analyze the exhibit and the options to determine which change in packet loss would make HUB1-VPN3 the new preferred member.

Lezlie 2 months ago

↳ replying to Colette

I’m leaning towards option C. Higher loss on HUB1-VPN1 makes sense.

Dudley 3 months ago

↳ replying to Colette

But what about option A? Equal packet loss could change things too.

Ruth 3 months ago

↳ replying to Colette

I think it might be option D. Lower packet loss could help HUB1-VPN3.

Fortinet NSE5_SSE_AD-7.6 Exam - Topic 5 Question 3 Discussion