A customer has several small to medium-sized remote branches and with these specific per-site requirements: - WAN link redundancy - no need for consistent end-to-end QoS (QoS is applied to the edge…

Question

Options

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

• A
  2% (1)
• B
  11% (6)
• C
  4% (2)
• D
  83% (45)

Explanation

The requirements point to a low-cost, redundant design without SLA constraints. Internet links are inexpensive and have no carrier SLA, satisfying 'low cost' and 'no strict SLA.' A single edge router keeps hardware costs down for small/medium branches. Dual-homed Internet connections (two ISP paths) provide WAN link redundancy. A site-to-site VPN (e.g., DMVPN or IPsec) provides secure connectivity over those Internet links. QoS on edge routers alone is sufficient since end-to-end QoS consistency is not required. Options A and B add unnecessary cost and complexity (dual routers). Option C uses MPLS, which has higher cost and SLA commitments.

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