300-420 Question #360: Real Exam Question with Answer & Explanation

Question

A customer has several remote sites connected with their headquarters through microwave links. An engineer must propose a backup WAN solution based on these conditions: - A physical WAN solution is not available for most of the sites. - The customer has a limited budget and a short time frame for implementation. - The backup link will have low bandwidth requirements. - Users will tolerate a WAN outage of up to 2 hours. Which backup WAN link type should the engineer recommend?

Options

• A802.15.1 Bluetooth
• BLTE
• C802.16 WiMAX
• Dlaser link

Explanation

The customer needs a backup WAN solution for remote sites with no physical WAN, limited budget/time, low bandwidth, and 2-hour outage tolerance.

Common mistakes.

• A. 802.15.1 Bluetooth is a very short-range wireless technology unsuitable for WAN backup links between remote sites and headquarters.
• C. 802.16 WiMAX is an older wireless technology that, while designed for metropolitan area networks, has largely been superseded by LTE/5G and is not as widely available or cost-effective for new deployments.
• D. Laser link (Free-Space Optical communication) requires a clear line-of-sight and can be sensitive to environmental conditions like fog or rain, making it less reliable and more complex to implement and maintain as a backup solution for multiple sites.

Concept tested. Backup WAN solutions, LTE suitability

Reference. https://www.cisco.com/c/en/us/products/routers/4g-lte-a-5g-wireless-wan-cellular-gateways-routers.html

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