Free NS0-520 sample questions

Correct answer: iSCSI over the existing 10GbE network, leveraging Quality of Service (QoS) on the network switches.

iSCSI is the optimal choice as it leverages the existing 10GbE infrastructure, reducing costs and complexity. ONTAP QoS policies can be applied at the SVM or LUN level to guarantee performance for the VDI workload, providing predictable low latency. This approach allows for independent scaling of storage performance (by adding more nodes or faster media) and capacity without requiring a separate SAN fabric.

Correct answer: The required cable lengths and types (optical, DAC) to reach the top-of-rack switches.

In a top-of-rack design with limited space, ensuring the correct cable types (e.g., SFP+ DAC for short-run iSCSI, optical for FC) and lengths are available is critical to a smooth installation. Ordering incorrect cables can cause significant delays. While power and cooling are important, cable management and connectivity are often overlooked and are particularly challenging in dense, top-of-rack environments.

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.