300-420 Question 151
Select 3An enterprise is redesigning its WAN architecture to improve scalability, reliability, and cost efficiency. The company plans to migrate from traditional MPLS to a hybrid WAN solution using SD-WAN. During the design phase, which key considerations should the network architect prioritize to ensure the success of the deployment?
- A
Define application performance requirements and implement traffic steering policies.
- B
Ensure that all SD-WAN devices are from the same vendor to avoid interoperability issues.
- C
Design a secure overlay network with end-to-end encryption and segmentation.
- D
Evaluate existing ISP links to determine their capacity and reliability.
- E
Deploy an MPLS backup link for all sites to maintain full redundancy.
Show answer and explanation
Correct answers: A, C, D
Explanation
In an SD-WAN implementation, the architect must prioritize application performance, security, and the evaluation of available transport options. Defining traffic steering policies ensures critical applications are prioritized, while securing the overlay network protects data and meets compliance standards. Additionally, assessing ISP links ensures the transport infrastructure can support the hybrid WAN design. The focus on cost efficiency and flexibility makes MPLS optional and dependent on the specific design requirements.
- A. Correct.
Correct. Understanding application performance requirements and implementing traffic steering policies is essential in SD-WAN to prioritize critical applications and ensure optimal user experience.
- B. Incorrect.
Incorrect. While vendor compatibility is important, SD-WAN solutions are often vendor-agnostic, and interoperability with existing infrastructure can be achieved without requiring all devices to be from the same vendor.
- C. Correct.
Correct. A secure overlay network with encryption and segmentation is crucial to protect data and ensure compliance with security policies.
- D. Correct.
Correct. Assessing current ISP links is necessary to ensure they meet the bandwidth and reliability requirements of the new hybrid WAN architecture.
- E. Incorrect.
Incorrect. While MPLS can be used as a transport option in hybrid WANs, it is not mandatory to deploy MPLS as a backup at all sites. The design should focus on the most cost-effective and reliable options, which could include broadband or LTE.