300-320 · Question #697
300-320 Question #697: Real Exam Question with Answer & Explanation
The correct answer is D: dual-homed Internet with a single edge router running a site-to-site VPN topology. 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 connect
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
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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