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Question 43 - 500-220 discussion

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A customer requires a hub-and-spoke Auto VPN deployment with two NAT-mode hubs with dual uplink connections and 50 remote sites with a single uplink connection.

How many tunnels does each hub need to support?

A.

52

Answers
A.

52

B.

54

Answers
B.

54

C.

100

Answers
C.

100

D.

104

Answers
D.

104

Suggested answer: D

Explanation:

https://documentation.meraki.com/Architectures_and_Best_Practices/Auto_VPN_Hub_Deployment_Recommendations

This is the number of tunnels that each hub needs to support in a hub-and-spoke Auto VPN deployment with two NAT-mode hubs with dual uplink connections and 50 remote sites with a single uplink connection.This can be calculated by using the formula for the hub tunnel count in a hub-and-spoke topology1:

Hub Tunnel Count = (H x (H - 1) / 2 x L1) + (H x S x L1 x L2)

Where H is the number of hubs, S is the number of spokes, L1 is the number of uplinks for the hubs, and L2 is the number of uplinks for the spokes. In this case, H = 2, S = 50, L1 = 2, and L2 = 1. Therefore,

Hub Tunnel Count = (2 x (2 - 1) / 2 x 2) + (2 x 50 x 2 x 1) Hub Tunnel Count = (2 x 1 / 2 x 2) + (200 x 2) Hub Tunnel Count = (2 / 2 x 2) + (400) Hub Tunnel Count = (1 x 2) + (400) Hub Tunnel Count = 2 + 400 Hub Tunnel Count =402

This question is related to the topic ofAuto VPN Hub Deployment Recommendationsin the Cisco Meraki documentation. You can find more information about this topic in theAuto VPN Hub Deployment Recommendationsarticle or theMeraki Auto VPN General Best Practicespage.

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asked 11/10/2024
BERNDT HAMBOECK
26 questions
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