CCDE: Cisco Certified Design Expert (Practical) — Question 248

Company XYZ is in the process of identifying which transport mechanism(s) to use as their WAN technology. Their main two requirements are:
* a technology that could offer DPI, SLA, secure tunnels, privacy, QoS, scalability, reliability, and ease of management
* a technology that is cost-effective
Which WAN technology(ies) should be included in the design of company XYZ?

Answer options

• A. Both technologies should be used. Each should be used to back up the other one; where the primary links are MPLS, the Internet should be used as a backup link with IPsec (and vice versa).
• B. MPLS meets all these requirements and it is more reliable than using the Internet. It is widely used with clearly defined best practices and an industry standard.
• C. Software-defined WAN should be the preferred choice because it complements both technologies, covers all the required features, and it is the most cost- effective solution.
• D. Internet should be the preferred option because it is cost effective and supports BFD, IP SLA, and IPsec for secure transport over the public Internet.

Correct answer: C

Explanation

The correct answer is C because Software-defined WAN provides comprehensive features that align with company XYZ's requirements while being cost-effective. Options A and B involve MPLS, which, while reliable, does not meet the cost-effectiveness requirement as well as SD-WAN. Option D, while cost-effective, lacks the full range of features required by the company.