Which of the following is the most critical factor of a Parallel Sysplex across multiple sites?

Which of the following is the most critical factor of a Parallel Sysplex across multiple sites?
A . Coordinated Timing Network (CTN)
B . Sysplex Distributor
C . Network bandwidth
D . Network latency

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Answer: A

Explanation:

GDPS is a multi-site or single-site end to end application availability solution that provides the capability to manage remote copy configuration and storage subsystems (including IBM TotalStorage Enterprise Storage Server), to automate Parallel Sysplex operation tasks and perform failure recovery from a single point of control.

A Coordinated Timing Network (CTN) is a collection of servers and Coupling Facilities that are time synchronized to a time value called Coordinated Server Time.

STP (Server Time Protocol) introduces the concept of a Coordinated Timing Network (CTN), to meet two key goals of System z customers:

Concurrent migration from an existing External Time Reference (ETR) network to a timing network using STP.

Capability of servers that cannot support STP to be synchronized in the same network as servers that support STP (z9 EC, z9 BC, z990, z890)

References: System z Parallel Sysplex Best Practices (January 2011)

https://www-03.ibm.com/systems/z/advantages/gdps/faqs.html