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An incident response plan in a data centre is primarily focused on outlining actions to take during and after a security breach to mitigate damage. This plan is critical for ensuring that there is a structured approach to handling unexpected events that could compromise the integrity, confidentiality, or availability of data within the data centre.

Having a well-defined incident response plan helps minimize the impact of an incident by specifying roles, responsibilities, and procedures that staff should follow when an incident occurs. This includes steps for identifying the breach, containing the incident, eradicating the threat, recovering from the incident, and evaluating the response's effectiveness afterward.

By clearly defining these procedures, the data centre can respond swiftly and efficiently, potentially reducing downtime, limiting financial losses, and protecting sensitive information. This proactive measure ensures that the data centre maintains resilience against cyber threats and can restore normal operations as quickly as possible.

In contrast, improving network speed, managing hardware upgrades, or providing guidelines for staff training do not directly address the processes required to respond to incidents—therefore, they do not align with the core purpose of an incident response plan.