400-007 · Question #145
Refer to the exhibit. ACME Mining has four data centers in Santiago, Cape Town, Mumbai, and Beijing, full-mesh connected via a 400 Mb/s EVP-LAN. They want to deploy a new mission-critical…
The correct answer is D. Cape Town and Mumbai. The application requires a one-way maximum latency of 100 ms between the two cluster nodes. The exhibit's ping test results (round-trip times) must be divided by 2 to get the one-way latency. The pair Cape Town and Mumbai has the shortest geographic separation among the…
Question
Refer to the exhibit. ACME Mining has four data centers in Santiago, Cape Town, Mumbai, and Beijing, full-mesh connected via a 400 Mb/s EVP-LAN. They want to deploy a new mission-critical application with these requirements:
- cluster heartbeat 2 Mb/s continuous (250 KB/s)
- cluster heartbeat one-way maximum latency 100 ms
These are the current ping tests results between the four data centers:
Which hosting data center pair can host the new application?
Exhibits
Options
- AMumbai and Beijing
- BSantiago and Cape Town
- CSantiago and Mumbai
- DCape Town and Mumbai
- ECape Town and Beijing
- FSantiago and Beijing
How the community answered
(21 responses)- A10% (2)
- D86% (18)
- E5% (1)
Explanation
The application requires a one-way maximum latency of 100 ms between the two cluster nodes. The exhibit's ping test results (round-trip times) must be divided by 2 to get the one-way latency. The pair Cape Town and Mumbai has the shortest geographic separation among the candidate pairs, yielding a one-way latency within the 100 ms limit. All other pairs - particularly those involving Santiago or Beijing paired with distant sites - exceed 100 ms one-way when the round-trip ping values from the exhibit are halved. Bandwidth is not the binding constraint here because all links are 400 Mb/s and the heartbeat only needs 2 Mb/s; latency is the disqualifying factor for every incorrect pair.
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