Network Operations

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An organization is updating its disaster recovery plan for a mission-critical e-commerce application. The business continuity policy mandates a Recovery Time Objective (RTO) of less than 15 minutes and a Recovery Point Objective (RPO) of near zero (under 1 minute). Which TWO of the following deployment and recovery strategies will meet both requirements?

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Implement synchronous database replication across geographically redundant active-active data centers.

Deploy automated global server load balancing (GSLB) with short DNS TTLs for rapid traffic redirection upon primary site failure.

Schedule nightly full backups combined with hourly incremental file backups copied to a secondary cold site.

Configure asynchronous batch database snapshots transferred to a warm site every 2 hours.

Maintain a warm site pre-configured with network infrastructure while restoring the latest differential backup upon disaster declaration.

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Cevap: Implement synchronous database replication across geographically redundant active-active data centers.; Deploy automated global server load balancing (GSLB) with short DNS TTLs for rapid traffic redirection upon primary site failure.

Cevap

The strategy requires synchronous database replication across active-active data centers to guarantee an RPO of under 1 minute, paired with automated global server load balancing (GSLB) and short DNS TTLs to achieve an RTO of under 15 minutes.

Synchronous replication commits writes across sites simultaneously to achieve near-zero data loss (meeting the 1-minute RPO requirement). Automated GSLB with low TTLs swiftly shifts network traffic to the functional location without manual baseline server setup (meeting the 15-minute RTO requirement).

Adım Adım Çözüm

Analyze RPO requirements

Near-zero RPO (< 1 minute) requires continuous real-time data synchronization rather than periodic backup intervals or asynchronous snapshots.

Any batch backup or asynchronous process with intervals greater than 1 minute exposes the organization to unacceptable data loss.

Analyze RTO requirements

Near-instant RTO (< 15 minutes) requires pre-provisioned active infrastructure (hot site or active-active) and automated network failover.

Cold or warm site recovery strategies rely on manual server provisioning or backup restoration steps that consume more than 15 minutes.

Select matching technologies

Synchronous database replication satisfies the RPO constraint, while GSLB with short DNS TTLs satisfies the RTO constraint.

Together, these solutions deliver continuous uptime capability and immediate disaster failover.

Anahtar Kavram

Disaster Recovery Site Selection, RTO, and RPO Alignment

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A system administrator is restoring an enterprise Network Management System (NMS) server after a storage volume corruption on Friday at 09:00. The established backup strategy executes a full backup every Sunday at 00:00 and differential backups every evening at 23:00 from Monday through Thursday. To achieve complete recovery to the latest available state with minimal restoration steps, which backup restoration sequence must be executed?

Restore the Sunday full backup first, then restore only the Thursday differential backup.

Restore the Sunday full backup first, followed sequentially by the Monday, Tuesday, Wednesday, and Thursday backups.

Restore only the Thursday differential backup directly to the target storage volume.

Restore the Thursday differential backup first, and then apply the Sunday full backup to populate missing baseline files.

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Cevap: Restore the Sunday full backup first, then restore only the Thursday differential backup.

Cevap

Restore the Sunday full backup first, then restore only the Thursday differential backup.

Differential backups save all modified files since the last full backup without resetting the archive attribute. Restoring the baseline full backup from Sunday establishes the system foundation, and applying the Thursday differential backup updates all files to their state prior to the failure in the minimum number of recovery steps.

Adım Adım Çözüm

Identify the baseline full backup requirement.

The Sunday 00:00 full backup provides the fundamental operating system, service configuration, and baseline data.

All recovery procedures using differential or incremental strategies require restoring the baseline full backup first.

Determine the characteristics of differential backups.

Each differential backup captures all changes made since the Sunday full backup without clearing the archive bit.

Because changes accumulate, the Thursday differential backup contains all modifications from Monday, Tuesday, Wednesday, and Thursday.

Select the minimal restoration sequence.

Restoring the Sunday full backup followed by the Thursday differential backup completely recovers the system state.

This two-step process minimizes recovery time and avoids redundant restore tasks.

Anahtar Kavram

Differential Backup Restoration Mechanics

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Network Operations

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