Designing Cisco Data Center Infrastructure (DCID) — Question 153

A customer with a single data center wants to provide resiliency in the form of an additional hosting location. The customer's engineering team requested asynchronous replication for the primary systems. The team prefers a minimal latency between locations for data replication and they can tolerate a 4-hour MTTR period. Which architecture offers maximum business continuity in the event of a primary data center failure?

Answer options

• A. new secondary data center with Layer 3 VXLAN spanned between data centers 2 km away with RTT 2 ms
• B. new secondary data center with Layer 2 spanned between data centers 1000 km away with RTT 10 ms
• C. A new DR site 50 km away with RTT 5 ms
• D. new secondary data center with Layer 2 spanned between data centers 2 km away with RTT 2 ms

Correct answer: C

Explanation

The correct answer is C because a DR site 50 km away with RTT 5 ms offers a good balance of distance and latency, ensuring reliable asynchronous replication while adhering to the acceptable MTTR. Options A and D provide lower latency, but do not meet the necessary criteria for a secondary data center with asynchronous replication for maximum business continuity. Option B, despite having a higher RTT, is too far to be effective for the required resiliency.