NS0-165

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The dumps for NS0-165 exam was last updated on May 13,2026 .

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Question#1

A Cloud Infrastructure Architect deploys a highly available Cloud Volumes ONTAP (CVO) pair across AWS Availability Zone A (Node 1) and Zone B (Node 2). An ONTAP Mediator is deployed in Zone C to provide tiebreaking quorum.
Due to a catastrophic AWS network routing failure, Zone A and Zone B completely lose the ability to communicate with each other over the inter-AZ VPC subnets. The high-speed synchronous HA interconnect drops.
However, both Zone A (Node 1) and Zone B (Node 2) maintain perfect, uninterrupted network connectivity to the ONTAP Mediator in Zone C.
Based on the architectural mechanics of CVO split-brain mitigation, exactly how does the ONTAP Mediator resolve this network partition to prevent data corruption?

A. Upon detecting the network partition, the Mediator triggers a coordinated graceful shutdown of both nodes via the AWS EC2 API (using the stop-instances command), bringing the entire cluster offline to eliminate concurrent write risks and guarantee zero data corruption.

B. The Mediator functions as an active data proxy, dynamically routing the synchronous NVRAM write journal between Node 1 and Node 2 over the management network via a secure tunnel established through the Mediator instance in Zone C, maintaining active-active mirror synchronization until the primary interconnect is restored.

C. The Mediator dynamically reconfigures the CVO cluster, downgrading the HA pair into two independent single-node clusters by splitting the shared namespace and aggregates, with each node assigned a distinct portion to preserve partial client access during the partition event.

D. The Mediator detects both nodes are alive but isolated. To prevent split-brain, it grants the quorum lock to the first node contacting it (Node 1), fences Node 2 to force release of floating IPs and halt services, and allows Node 1 to continue serving clients.

Question#2

A Network Administrator is tasked with assisting the storage team during an Automated Non-Disruptive Upgrade (ANDU) of a 4-node MetroCluster IP configuration. The MetroCluster spans two data centers separated by 50 kilometers.
The administrator is reviewing the high-level upgrade plan and the related syslog events generated during a test run of the first phase:
```
# Proposed MetroCluster Upgrade Plan:
Phase 1: Upgrade Site A (Node 1 and Node 2) locally using standard HA rolling reboot.
Phase 2: Verify DR replication status.
Phase 3: Upgrade Site B (Node 3 and Node 4) locally using standard HA rolling reboot.
# Syslog snippet from Phase 1 test (Node 1 rebooting):
10:00:01 cluster_A node1: update.node.started: Info: Node update started.
10:00:05 cluster_A node1: cf.takeover.started: Notice: HA partner node2 is initiating takeover.
10:00:15 cluster_A node1: mcc.dr.status.changed: Warning: MetroCluster DR status is 'degraded' due to local HA takeover.
10:05:00 cluster_A node2: netif.lif.failover.success: Notice: LIF 'svm_nas_prod' successfully failed over to node2.
```
Based on the deep interaction between MetroCluster architectures and the ONTAP ANDU process, which of the following statements correctly evaluate this upgrade strategy and its network implications? (Select all that apply.)

A. The successful LIF failover to node2 confirms that client data traffic at Site A continues to be serviced locally without needing to traverse the 50km ISL to Site B during the controller reboot.

B. If the 50km ISL connection fails simultaneously while Node 1 is rebooting during Phase 1, Site B will automatically initiate an unplanned switchover to resume serving Site A's data.

C. The syslog event mcc.dr.status.changed: Warning indicates a fatal configuration error; a MetroCluster should transition to a full switchover state rather than a degraded state during an ANDU node reboot.

D. During the local HA takeover at Site A (Phase 1), the MetroCluster synchronous replication to Site B is temporarily suspended, forcing the architect to rely on asynchronous SnapMirror to maintain data protection.

E. The proposed strategy of performing localized rolling HA reboots at each site independently is the correct and supported method for upgrading a MetroCluster environment non-disruptively.

Question#3

A Cloud Infrastructure Architect is troubleshooting a throughput bottleneck on a massive VMware ESXi 7.0 host. The host is connected to an AFF A800 cluster via a dedicated 100GbE network.
The datastore is mounted using NFSv3. The backend NVMe SSDs are completely uncongested.
During a massive sequential read benchmark (e.g., Storage vMotion), the architect observes that the throughput perfectly plateaus at roughly 2.5 GB/s (20 Gbps), stranding 80% of the network interface's bandwidth. The ONTAP Data CPU domain shows very low utilization, but the ESXi host's CPU metrics show a single core pegged at 100%.
Based on the architectural limitations of traditional NAS protocols over high-speed networks, what specific mechanism MUST the architect configure to break this single-stream bottleneck?

A. The architect must enable NFSv4.1 and configure Parallel NFS (pNFS) on the SVM to distribute read requests across multiple ONTAP cluster nodes simultaneously, leveraging aggregate bandwidth capabilities.

B. The architect must configure the nconnect mount option on the ESXi host to establish multiple parallel TCP connections to the ONTAP Data LIF, enabling RSS to distribute TCP processing across multiple CPU cores.

C. The architect must enable SMB Multichannel on the SVM; however, this solution applies only to SMB workloads and does not resolve limitations inherent to the existing NFSv3 protocol over a single 100GbE broadcast domain.

D. The ONTAP storage controller mathematically restricts single-LIF NFSv3 throughput to exactly 20 Gbps to prevent buffer starvation; therefore, the architect must create multiple datastores, each mounted to a distinct ONTAP LIF, to aggregate bandwidth and bypass this constraint.

Question#4

Which statement correctly describes the architectural difference in failover behavior between SAN and NAS logical interfaces (LIFs) during a storage controller failure?

A. NAS LIFs migrate their IP addresses to a surviving port in the broadcast domain; SAN LIFs remain fixed and rely on host MPIO software for failover path management.

B. Both SAN and NAS LIFs rely on ONTAP's dynamic IP mobility feature to transition the logical interface to the surviving node during a controller failure event without requiring host-side timeout configurations.

C. Within the ONTAP cluster architecture, SAN LIFs are strictly confined to their designated HA pair with no migration capability, while NAS LIFs leverage cluster-wide mobility to fail over to any operational node across the entire cluster fabric.

D. NAS LIFs utilize Asymmetric Logical Unit Access (ALUA) to redirect traffic, whereas SAN LIFs use gratuitous ARP to migrate their MAC addresses to the surviving HA partner.

Question#5

A SAN Administrator is provisioning a 10TB LUN for a new, highly transactional SQL Server database. The database vendor strictly requires that storage performance remains absolutely consistent and that the database never experiences a write failure due to underlying storage array capacity exhaustion, regardless of how the array is monitored.
Which provisioning strategy MUST the administrator implement to satisfy these strict vendor requirements?

A. Deploy the LUN inside a FlexGroup volume to seamlessly distribute the physical block allocation across multiple aggregates, avoiding localized exhaustion.

B. Enable the auto-grow feature on a thin-provisioned volume, ensuring ONTAP dynamically adds aggregate space before the SQL Server can detect a capacity limit.

C. Configure the volume space guarantee to none and set the LUN space reservation to enabled, utilizing thin provisioning for flexibility.

D. Configure both the volume space guarantee to volume and the LUN space reservation to enabled to definitively pre-allocate all required physical blocks.

Exam Code: NS0-165 Q & A: 105 Q&As Updated: May 13,2026

Full NS0-165 Exam Dumps Here

Exam Code: NS0-165
Q & A: 105 Q&As
Updated: May 13,2026

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