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NetApp Certified Support Engineer ONTAP Specialist Free Sample Questions

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NS0-594 Sample Questions

  1. Q1

    A storage support engineer is investigating unexpected warning messages on an ONTAP 9 cluster. When running the command 'event log show' with no additional parameters, which event severity levels are displayed by default?

    Show answer & explanation

    Correct answer: A

    According to official ONTAP documentation, 'event log show' displays events of severity EMERGENCY, ALERT, and ERROR by default. To view NOTICE, INFORMATIONAL, or DEBUG events, an administrator must explicitly pass the '-severity' parameter.

    Timed and flashcard mode in the Simulator
  2. Q2

    During an unscheduled maintenance call, an engineer needs to immediately generate and transmit a full diagnostic telemetry bundle for node-01 to NetApp Active IQ support without waiting for the scheduled weekly transmission. Which ONTAP CLI command performs this task?

    Show answer & explanation

    Correct answer: A

    The command 'system node autosupport invoke' triggers an on-demand AutoSupport message collection. Specifying '-type all' ensures that the complete diagnostic bundle is gathered and transmitted, while '-message' adds custom tracking text such as a support case number.

    Timed and flashcard mode in the Simulator
  3. Q3

    A 4-node ONTAP cluster experiences a dual-link failure on the dedicated cluster interconnect network, isolating node-03 and node-04 from node-01 and node-02. Node-01 holds cluster epsilon. How does cluster quorum resolve this partition?

    Show answer & explanation

    Correct answer: A

    ONTAP quorum requires a strict majority (>50%) of votes. In an even-node cluster (4 nodes = 4 standard votes), an additional tiebreaker vote (epsilon, valued at 0.5 or 1 extra fractional weighting) is assigned to a single node. The partition containing node-01 with epsilon has majority voting weight (2 standard votes + epsilon), allowing nodes 01 and 02 to remain online and serve data while nodes 03 and 04 lose quorum and halt write operations.

    Timed and flashcard mode in the Simulator
  4. Q4

    A support specialist observes that the command 'cluster ring show' indicates the 'mgwd' unit is offline or in a master-less state across two nodes in an 8-node cluster, while all other rings (vldb, vifmgr, bcom) show healthy quorum.

    flowchart TD subgraph RDB_Rings [Replicated Database Rings] VLDB[VLDB: In Quorum / Master Elected] VIFMGR[VIFMGR: In Quorum / Master Elected] BCOM[BCOM: In Quorum / Master Elected] MGWD[MGWD: Offline / Quorum Lost] end RDB_Rings --> Effect{Impact on Storage System}

    What is the direct operational impact on the ONTAP cluster?

    Show answer & explanation

    Correct answer: A

    The mgwd (Management Gateway Daemon) ring manages cluster management transactions, CLI, REST API, and System Manager sessions. Because the volume location database (vldb) and virtual interface manager (vifmgr) rings remain in quorum, data path routing and client I/O continue normally. However, management commands that rely on mgwd synchronization will fail or hang.

    Timed and flashcard mode in the Simulator
  5. Q5

    A scheduled SnapMirror asynchronous update operation repeatedly fails with the status error: 'Transfer failed. (Cannot find common Snapshot copy between source and destination)'. Which troubleshooting workflow is required to restore replication while preserving destination retention history if possible?

    Show answer & explanation

    Correct answer: A

    SnapMirror relies on an identical common base Snapshot copy on both source and destination volumes. If the common snapshot was inadvertently deleted on the source (e.g., due to autodelete or manual cleanup), the relationship cannot perform incremental updates. An engineer can identify if any other common snapshot exists or execute 'snapmirror resync' pointing to a valid shared snapshot. If no common Snapshot copy remains anywhere, a full re-initialization is required.

    Timed and flashcard mode in the Simulator
  6. Q6

    When diagnosing a failing SnapMirror relationship across two peered clusters, an engineer executes 'cluster peer health show' and discovers that Ping Status shows 'reachable' but Data Operation Status reports 'unreachable' on node-02. What is the most probable root cause?

    Show answer & explanation

    Correct answer: A

    ONTAP cluster peering uses ICMP for basic reachability tests (ping), but data replication and RPC control operations require TCP ports 11104 (intercluster communication) and 11105 (data transfer). If a firewall permits ICMP but blocks these specific TCP ports, Ping Status will succeed while Data Operation Status reports unreachable.

    Timed and flashcard mode in the Simulator

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