Free NS0-520 sample questions

Correct answers: Interoperability Matrix Tool (IMT); Hardware Universe (HWU)

The IMT is the primary tool for verifying end-to-end support for software and firmware components, including HBA drivers, switch firmware, and operating system versions.

The Hardware Universe is used to validate the compatibility of physical hardware components, such as HBA models, SFPs, and switches, with the NetApp storage controllers.

Correct answer: False

This statement is false. Asymmetric Namespace Access (ANA) is designed to inform the host about optimal and non-optimal paths. Paths to the node that owns the aggregate where the namespace resides are reported as 'Optimized/Active', while paths to other nodes in the cluster are reported as 'Non-Optimized/Active'. This allows the host's multipathing software to prioritize I/O on the most efficient paths.

Correct answer: The LUN is offline; a 'snapmirror break' command must be executed on the secondary SVM.

With SnapMirror Synchronous, the destination LUN is not directly accessible until the relationship is broken. In a disaster recovery scenario where the primary is unavailable, the `snapmirror break` command must be run on the destination SVM. This action promotes the destination volume to read/write, allowing the LUN to be brought online and mapped to hosts.

Correct answer: Enable deduplication on the containing FlexVol volume, then create the LUN with space reservation disabled.

Storage efficiency features like deduplication and compression are enabled at the FlexVol volume level, not on individual LUNs. To achieve the goal, the administrator must first ensure deduplication is enabled on the volume that will contain the LUN. Then, the LUN should be created with space reservation disabled (`-space-reserve disabled`), which is how thin provisioning is implemented for a LUN in ONTAP.

Correct answer: lun show -vserver -path -fields node, qtree, volume

The `lun show` command with the `-fields node` parameter is the most direct way to identify which node currently owns the volume containing the LUN. This information is crucial for determining the optimal I/O paths. If the host is primarily using LIFs on a different node, it indicates a pathing issue that would cause higher latency due to cluster interconnect traffic.

Correct answer: The LIF's firewall policy is blocking the iSCSI service.

Since the LIF is reachable via ping (ICMP), basic network connectivity is confirmed. However, the lack of response to iSCSI discovery requests (typically on TCP port 3260) points to a higher-level block. In ONTAP, each LIF has an associated firewall policy. If this policy does not explicitly allow the 'iscsi' service, the node will drop the incoming discovery packets, leading to this exact symptom.

Correct answer: Shutting down the host, rezoning the fabric, and rescanning for LUNs on the ONTAP paths.

The cutover for FLI requires a brief outage. The correct procedure involves shutting down the application/host, removing the zoning for the old storage array paths, creating new zones for the ONTAP paths, and then bringing the host back up. Once online, a rescan of the storage bus will discover the LUNs presented from the ONTAP system, completing the migration.

Correct answer: To restrict the FCP target LIFs that an igroup can use for LUN discovery and access.

A portset is a mechanism used to control which FCP target LIFs are visible to a specific initiator group (igroup). By binding an igroup to a portset, you limit the paths that the initiators in that group can use to access LUNs. This is often used to enforce specific pathing policies or to isolate traffic in multi-tenant environments.

Correct answer: Two LIFs per node, for a total of four.

NetApp best practice for iSCSI is to configure a minimum of two data LIFs per node for each SVM providing SAN access. This configuration provides path redundancy across the node's network ports and allows for better load balancing by the host's multipathing software. For a 2-node cluster, this results in a total of four LIFs for the SVM.

Correct answer: N_Port ID Virtualization (NPIV)

NPIV is a fundamental requirement for both FCP and NVMe/FC in a virtualized storage environment like ONTAP. It allows a single physical Fibre Channel port (N_Port) to register multiple unique World Wide Port Names (WWPNs) with the fabric. ONTAP uses this feature to assign unique WWPNs to each FCP and NVMe/FC LIF, which is essential for proper zoning and host recognition.