400-007 · Question #105
400-007 Question #105: Real Exam Question with Answer & Explanation
The correct answer is A: Software-defined WAN should be the preferred choice because it complements both. SD-WAN is the optimal WAN technology choice when requirements include both advanced enterprise features and cost-effectiveness, as it delivers all listed capabilities over cost-efficient transport.
Question
Options
- ASoftware-defined WAN should be the preferred choice because it complements both
- BInternet should be the preferred option because it is cost effective and supports BFD, IP SLA. and
- CBoth technologies should be used. Each should be used to back up the other one; where the
- DMPLS meets all these requirements and it is more reliable than using the Internet. It is widely
Explanation
SD-WAN is the optimal WAN technology choice when requirements include both advanced enterprise features and cost-effectiveness, as it delivers all listed capabilities over cost-efficient transport.
Common mistakes.
- B. The internet alone lacks native support for DPI, SLA guarantees, and built-in QoS without additional overlay technologies, making it insufficient to meet all listed enterprise requirements on its own.
- C. Using both technologies purely as mutual backups does not address the unified requirement for cost-effectiveness combined with enterprise features; SD-WAN already abstracts both transports under a single policy framework.
- D. MPLS does not natively provide DPI, secure tunnels, or ease of centralized management, and its cost is significantly higher than internet-based alternatives, failing the cost-effectiveness requirement.
Concept tested. SD-WAN capabilities vs. traditional WAN technologies
Reference. https://www.cisco.com/c/en/us/solutions/enterprise-networks/sd-wan/what-is-sd-wan.html
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