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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Test BCDR Solutions | 25% | - Execute planned, unplanned, and test failovers - Perform disaster recovery validation procedures - Verify site connectivity and replication throughput - Validate recovery plan execution and outcomes |
| Topic 2: Troubleshoot BCDR Failures | 20% | - Diagnose network-related replication failures - Troubleshoot replication and protection policy issues - Resolve misconfigurations in DR environments - Fix third-party backup integration problems - Resolve storage and snapshot errors |
| Topic 3: Perform BCDR Operational Tasks | 25% | - Snapshot-based VM and volume recovery - Self-service restore operations - Migrate legacy protection domains to modern policies - Post-failover cleanup and re-protection - Execute failover and failback workflows |
| Topic 4: Interpret and Configure BCDR Requirements | 30% | - Configure snapshot policies and retention - Determine prerequisites for BCDR configuration - Create and configure recovery plans - Configure network and storage for BCDR - Select replication types: Async, NearSync, Synchronous, Metro - Translate business requirements into RPO/RTO objectives - Design secure BCDR environments: segmentation, RBAC, approval policies |
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問題 #28
An administrator configures a protection policy that replicates workloads to two different recovery AZs (multisite deployment). Replication to both recovery AZs is successful. However, when attempting to perform failover to the second recovery AZ, the administrator cannot select it as a failover target.
Which setup step was most likely missed?
答案：C
問題 #29
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?
答案：C
解題說明：
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.
問題 #30
What is the bandwidth limit of a single Nutanix Cloud Gateway for IPSec traffic?
答案：D
解題說明：
The Nutanix Cloud Gateway serves as a critical bridge between on-premises Nutanix clusters and the Nutanix Cloud Availability Zone (AZ). Its primary role is to provide a secure, encrypted tunnel for replicating recovery points and managing disaster recovery orchestration metadata. When utilizing standard IPSec for this traffic, the system architecture imposes certain throughput limitations based on the processing capabilities of the gateway instance. For a single Nutanix Cloud Gateway, the maximum supported bandwidth for IPSec- encrypted traffic is 1 Gbps.
This 1 Gbps limit is an important consideration for BCDR planning, as it defines the maximum " Snapshot-on- wire " throughput available for a given protection policy. If an organization has a high data change rate (churn) that exceeds 1 Gbps of sustained replication traffic, the Recovery Point Objective (RPO) may be at risk of lag. While the physical network link might be 10 Gbps or higher, the encryption overhead of the IPSec protocol within the gateway VM is the limiting factor. To achieve higher aggregate throughput, administrators would need to deploy multiple gateways or consider high-performance direct connectivity options if available.
Understanding this 1 Gbps threshold ensures that administrators can accurately size their replication windows and manage expectations for initial seed transfers and ongoing delta synchronization to the cloud AZ.
問題 #31
An administrator is preparing to configure DR between an on-prem AZ and Nutanix Cloud AZ. Replication fails immediately after configuration. Which prerequisite should be verified?
答案：B
解題說明：
Establishing disaster recovery between an on-premises data center and a Nutanix Cloud Availability Zone (AZ) requires a robust communication path that can traverse different network boundaries. Unlike local replication within a single site, cross-site replication-especially to a public cloud environment-relies on the ability of the clusters to identify and reach one another over an external network. Nutanix Disaster Recovery requires that both the on-premises cluster and the Nutanix Cloud AZ instance have external IP addresses configured for their respective Controller VMs (CVMs) and virtual interfaces.
These external IP addresses allow the Cerebro service at the source site to establish a secure handshake with the Cerebro service at the cloud site. Without these routable external IPs, the replication traffic is unable to find its destination, leading to the immediate failure of the configuration as observed in this scenario. While identical hypervisors (Option A) are often preferred for simplicity, Nutanix supports Cross-Hypervisor DR (CHDR). Furthermore, deduplication status (Option C) does not prevent the establishment of a replication link. Synchronous replication (Option D) is restricted by latency requirements and is not a fundamental prerequisite for basic connectivity to a cloud AZ. Therefore, verifying the presence of external, reachable IP addresses is the mandatory first step in troubleshooting cross-site connectivity issues between on-premises and cloud environments.
問題 #32
An administrator plans on performing a failover of a VM from a source cluster to a DR cluster. The administrator needs the VM ' s IP address preserved after failover. In what scenario is the VM ' s IP address preserved?
答案：C
解題說明：
Preserving IP addresses during a failover is a common requirement for applications with hardcoded IP references or complex inter-service dependencies. In a standard multi-site DR setup, the source and destination sites reside on different Layer 3 subnets, meaning a VM would naturally require a new IP address to be routable at the recovery site. To achieve " IP Preservation, " the underlying network infrastructure must support Layer 2 (L2) stretching.
L2 stretching (often implemented via VXLAN or specialized VPN tunnels like Nutanix Flow Virtual Networking) allows a single logical subnet to span multiple physical locations. When a VM fails over to a cluster on a stretched subnet, it effectively stays on the same network broadcast domain. As a result, its IP address, default gateway, and subnet mask remain valid and unchanged. If the subnets are not stretched, the administrator must rely on the Recovery Plan ' s " IP Mapping " feature to assign a new, valid IP at the destination-which does not " preserve " the original address. While preserving IPs simplifies application recovery, it requires more complex network engineering to ensure that traffic is correctly routed to the active site during a disaster, highlighting the trade-off between application simplicity and infrastructure complexity in BCDR design.
問題 #33
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NCP-BC-7.5題庫: https://www.kaoguti.com/NCP-BC-7.5_exam-pdf.html