300-420 Question #98: Real Exam Question with Answer & Explanation

Question

An architect is working on a design to connect a company's main site to several small to medium- sized remote branches. The solution must include redundant WAN links, but the customer has a limited budget and wants the ability to increase the link speed easily in the future. QoS will not on the branch routers so there is no need for consistent end-to-end QoS. Which solution does the architect propose?

Options

• Adual-homed WAN MPLS with single edge router
• Bdual-homed Internet with a single edge router running a site-to-site VPN topology
• Cdual-homed WAN MPLS and Internet links via dual edge routers
• Ddual-homed Internet with dual edge routers running a hub-and-spoke VPN topology

Explanation

For a limited budget with redundant WAN links and easy future speed upgrades to connect branches, a dual-homed Internet connection with a single edge router running a site-to-site VPN topology is the optimal solution.

Common mistakes.

• A. Dual-homed WAN MPLS with a single edge router provides redundancy, but MPLS is generally more expensive than Internet links, making it less suitable for a limited budget and potentially more complex for speed upgrades.
• C. Dual edge routers add significant cost due to additional hardware and complexity, which goes against the 'limited budget' requirement, and MPLS also incurs higher costs.
• D. Dual edge routers again add significant cost, conflicting with the limited budget, despite a hub-and-spoke VPN topology being a valid design choice.

Concept tested. WAN design - VPN over Internet for branches

Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_VPN/VPN_Design_Guide/VPN_Design.html

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