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| Section | Objectives |
|---|---|
| Topic 1: Disaster Recovery Fundamentals | - Business Continuity Principles - DR Concepts (RPO, RTO, SLAs) |
| Topic 2: Nutanix Disaster Recovery Architecture | - Replication Types (Sync/Async) - Nutanix Leap Overview - Protection Domains |
| Topic 3: Recovery Operations | - Test Recovery Workflows - Recovery Plans and Orchestration - Failover and Failback Procedures |
| Topic 4: Data Protection and Backup Integration | - Backup Solutions Integration - Snapshot Management |
| Topic 5: Prism Central Management | - Cluster and Site Management - DR Monitoring and Operations |
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質問 # 61
An administrator needs to perform a test failover on a Recovery Plan. What is the primary goal of this action?
正解：A
解説：
The " Test Failover " feature in Nutanix Disaster Recovery is a critical tool for ensuring that a BCDR plan is actually functional before a real disaster occurs. The primary goal of a test failover is to validate the entire recovery orchestration-including power-on sequences, script execution, and network mappings-in a completely non-disruptive manner.
During a test failover, the virtual machines are recovered at the destination site using the most recent snapshots, but they are typically connected to an " Isolated " or " Test " network. This allows the administrator to log into the recovered VMs and verify that the application starts correctly without causing any IP address conflicts or interference with the live production systems at the primary site. Unlike a " Planned Failover " or
" Unplanned Failover, " a test failover does not move the production workload (negating Option B) and does not stop ongoing replication (negating Option D). It is purely a validation task designed to identify gaps in the Recovery Plan, such as missing dependencies or incorrect network assignments, thereby providing confidence that the organization ' s RTO and RPO goals can be met during a real emergency.
質問 # 62
An administrator configures disaster recovery between an on-premises AZ and a Nutanix Cloud AZ. After enabling DR and assigning protection policies to several VMs with volume groups, the administrator initiates failover and notices the VMs do not have their volume groups attached. Investigation reveals:
* The clusters are successfully paired in Prism Central.
* Protection policies and replication schedules are configured correctly.
* Recovery plan validation completes successfully.
* Required firewall ports between sites are confirmed open.
* Management IP addresses are reachable in both directions.
Despite this, the administrator observes the volume groups are still not attached. Which network-related prerequisite is most likely misconfigured?
正解：D
解説：
Nutanix Volume Groups (VGs) provide block-level storage to virtual machines, often used for high- performance databases or shared storage clusters. Unlike standard vDisks, which are managed directly as part of the VM ' s hardware definition, VGs are presented as iSCSI targets. In a Disaster Recovery scenario, when a VM is recovered at a new site, it must be able to " find " and re-attach these Volume Groups to resume operation.
For this attachment to succeed, especially across different clusters or into a Nutanix Cloud AZ, both the source and recovery clusters must have a " Data Services IP Address " configured. The Data Services IP acts as the cluster-wide iSCSI target portal. When a VM fails over, the Nutanix orchestration engine uses this IP to coordinate the iSCSI login and mapping of the Volume Group to the guest OS. If this IP is missing on either cluster, the internal iSCSI redirection and handoff mechanisms will fail, even if the general management networking and Protection Policies are perfectly healthy. This is a common " Day 1 " configuration error because management connectivity (Prism) works without a Data Services IP, but block-level services like VGs and certain NGT features strictly require it. Verifying and configuring the Data Services IP at both availability zones is the primary fix for Volume Group attachment failures during DR failover.
質問 # 63
A VM is configured with a 5-minute Nearsync RPO. After several hours, replication transitions back to hourly RPO. Alerts indicate the minute schedule cannot be maintained. What is the most likely root cause?
正解：A
解説：
Nutanix NearSync replication uses Lightweight Snapshots (LWS) to achieve RPOs as low as 1 minute. To maintain this aggressive schedule, the system must be able to replicate all the " delta " changes (the data that has changed since the last snapshot) within the RPO window. If the data change rate (churn) of the VM increases, or if the available network bandwidth decreases, the system may find that it cannot complete the replication of one LWS before the next one is due.
When the Nutanix Cerebro service detects that it is consistently missing its NearSync target, it will automatically " downshift " the replication to a standard Asynchronous schedule (typically hourly) to ensure that the VM remains protected at a manageable frequency. This is a self-healing mechanism designed to prevent replication jobs from stacking up and causing cluster instability. Insufficient bandwidth (Option D) is the most common cause for this downshift, as the " Snapshot-on-wire " cannot be moved fast enough to satisfy the 5-minute requirement. While high RTT (Option A) is a requirement for Synchronous replication, NearSync is designed to handle higher latencies (up to 80ms or more), making bandwidth the primary bottleneck in these troubleshooting scenarios.
質問 # 64
An administrator is configuring Disaster Recovery between an on-prem availability zone (AZ) and an NC2 cluster hosted in a public cloud. The business requires cross-cluster live migration between on-prem and NC2 without IP changes. Which configuration must be satisfied to meet this requirement?
正解：A
解説：
Cross-Cluster Live Migration (CCLM) is an advanced Nutanix feature that allows a running virtual machine to move between two geographically separated clusters without downtime. When migrating between on- premises and a public cloud Nutanix Cloud Cluster (NC2), maintaining the VM ' s network identity (IP address) is often a critical requirement for application continuity.
Standard routing across different networks would require the VM to change its IP to match the destination subnet. To avoid this, an administrator must implement " Layer 2 (L2) stretching " . L2 stretching (often achieved using Nutanix Flow Virtual Networking and VXLAN/VPN tunnels) creates a unified broadcast domain that spans both the on-premises and cloud sites. This allows the VM to move to the cloud while remaining on the same logical subnet, meaning its default gateway and IP address remain valid. Without L2 stretching, a " Live Migration " would fail the moment the VM moved to the new cluster because its network connections would drop. This configuration is a prerequisite for seamless hybrid cloud mobility, enabling businesses to leverage cloud burst capacity or perform zero-downtime maintenance across sites.
質問 # 65
An administrator initiates an unplanned failover due to a primary AZ outage. What is the worst-case scenario for data loss and which recovery point will be used by default?
正解：A
解説：
An " Unplanned Failover " is triggered when the primary site is completely offline or unreachable due to a disaster. Because the primary site cannot be contacted to perform one last synchronization of data, the recovery must rely on the recovery points that were successfully replicated to the destination cluster before the outage occurred.
In this scenario, the worst-case data loss is equivalent to the Recovery Point Objective (RPO) defined in the Protection Policy. For example, if the RPO is set to 1 hour, and the disaster occurs 59 minutes after the last successful replication, the business will lose 59 minutes of data. By default, the Nutanix orchestration engine will automatically select and use the most recent recovery point available at the recovery site to restore the virtual machines. While an administrator can manually choose an older recovery point if needed (e.g., in the case of a ransomware attack), the default behavior is to minimize data loss by using the newest available point. This highlights why setting an appropriate RPO is the most important design decision for managing potential data loss in an unplanned failure event.
質問 # 66
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