300-420 Question #268: Real Exam Question with Answer & Explanation

Question

Drag and Drop Question Drag and drop the descriptions from the left onto the categories they apply to on the right. Answer:

Explanation

This question tests the ability to differentiate between Metro Ethernet and SD-WAN by correctly associating their key characteristics with the respective technologies.

Approach. The correct interaction involves dragging the relevant descriptions to their corresponding technology categories. For 'Metro Ethernet', the descriptions are 'same technology that is used in the LAN' and 'bandwidth increased dynamically without installing new equipment'. For 'SD-WAN', the descriptions are 'large-scale IoT and mobile global enterprises deployments' and 'greater speed, reliability, and efficiency while connecting to cloud platforms'.

• 'same technology that is used in the LAN' applies to Metro Ethernet because it extends Ethernet technology, commonly used in Local Area Networks, across a metropolitan or wide area network. This provides a consistent networking experience.
• 'bandwidth increased dynamically without installing new equipment' also applies to Metro Ethernet because service providers can often provision bandwidth upgrades remotely via software configuration, eliminating the need for on-site hardware changes at the customer premise.
• 'large-scale IoT and mobile global enterprises deployments' applies to SD-WAN as it is designed to manage and optimize connectivity for highly distributed and complex networks, which are common in global enterprises with numerous IoT devices and mobile users.
• 'greater speed, reliability, and efficiency while connecting to cloud platforms' is a key benefit of SD-WAN. It intelligently routes traffic across multiple WAN links (e.g., MPLS, internet broadband, 4G/5G) to optimize performance for cloud applications, ensure high availability, and improve overall network efficiency by prioritizing critical traffic.

Common mistakes.

• common_mistake. A common mistake would be to confuse the characteristics of traditional WAN services like Metro Ethernet with the more modern, software-defined capabilities of SD-WAN. For example, incorrectly associating 'greater speed, reliability, and efficiency while connecting to cloud platforms' with Metro Ethernet overlooks SD-WAN's core strength in multi-link optimization and cloud-centric routing. Similarly, thinking 'bandwidth increased dynamically without installing new equipment' is an SD-WAN-specific feature might be incorrect, as this benefit often comes from managed Metro Ethernet services where the provider handles provisioning. SD-WAN primarily focuses on application-aware routing and centralized control over diverse underlying transport methods, while Metro Ethernet focuses on providing a scalable, consistent Ethernet-based transport layer.

Concept tested. The core concept tested is the understanding of different Wide Area Network (WAN) technologies, specifically Metro Ethernet and Software-Defined Wide Area Network (SD-WAN), and their respective features, benefits, and use cases.

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