CIS-DF Ingest — Timed 10 Questions

Question 1

During a Discovery run, a Linux server is identified, but its associated IP interfaces are missing from the cmdb_ci_ip_address table. Reviewing the payload processor logs shows an IRE payload error regarding related items. What is the most likely cause of this issue?

10 minute time limit — choose an answer to begin.

Accepted Answer

The identification rule for the IP address class lacks a valid criteria definition matching the hardware CI.. Identification rules for related lists or embedded objects in the payload must include valid relation identifiers, or the payload structure must correctly define parent-child relationships.

Answer

Discovery schedules do not support ingesting IP addresses automatically.

Answer

The cmdb_ci_ip_address table requires manual creation of records due to security restrictions.

Answer

Data Source Precedence has marked IP addresses as read-only.

Question 2

Which ServiceNow table stores the historical relationship between a CI and the various data sources that have updated its attributes, supporting the Data Source Precedence framework?

Accepted Answer

sys_object_source. The cmdb_ci_discovered_items or sys_object_source table tracks the relationship between CIs and their external ingestion sources.

Answer

cmdb_health_result

Answer

sys_import_set_row

Answer

cmdb_rel_ci

Question 3

A team is building a custom REST API integration that accepts incoming configuration items. They decide to use the Scripted REST API feature. Within the script of the REST resource, how should they invoke the IRE to process the incoming JSON body correctly?

Accepted Answer

Use `sn_cmdb.IdentificationEngine.createOrUpdateCI(discoverySource, payload)` within the script.. Scripted REST APIs can invoke the IRE using the `JSONUtil` or `sn_cmdb.IdentificationEngine` script includes.

Answer

Use the Import Set Web Service table API directly.

Answer

Instantiate a GlideRecord on `cmdb_ci` and call `.insert()` for each item in the JSON body.

Answer

Call `current.update()` after mapping the JSON properties to the request object.

Question 4

An architect is reviewing an integration that populates network gear into the CMDB. The integration payload includes both the physical chassis and installed line cards. The implementer wants to ensure that if a line card is removed from the chassis in the physical world, its relationship in the CMDB is automatically cleaned up when the integration runs. Which feature supports this behavior?

Accepted Answer

Configure the payload payload structure to mark the relationship as dependent, allowing the IRE to handle stale child relationships.. Configuring the payload structure to mark the relationship as dependent allows the IRE to handle stale child relationships by automatically removing them when the parent no longer includes the child. This is achieved through the IRE's dependent relationship processing, which ensures that if a line card is not present in the payload, its relationship to the chassis is deleted. This feature supports dynamic infrastructure changes without manual intervention.

Answer

Set the Data Source Precedence for line cards to 'Delete on Sync'.

Answer

Write a scheduled job to delete all line cards every night before the integration runs.

Answer

Enable 'Cascade Delete' on the cmdb_rel_ci dictionary entry.

Question 5

An administrator wants to view the list of all registered discovery sources in ServiceNow. Which table stores these discovery source definitions?

Accepted Answer

discovery_source. Discovery sources are tracked in the Discovery Source table (`discovery_source` or managed via reference definitions).

Answer

sys_data_source

Answer

cmdb_rel_ci

Answer

cmdb_ci

Question 6

An enterprise wants to ensure that data ingested via manual spreadsheets cannot overwrite critical network attributes populated by automated network discovery. Where should an administrator configure this restriction?

Accepted Answer

CI Class Manager -> Data Source Precedence. Attribute-level overwrite protection between different data sources is managed via Data Source Precedence rules.

Answer

Discovery Schedule Properties

Answer

Data Policies on cmdb_ci

Answer

Import Set Transform Map Field Maps

Question 7

An administrator is configuring Data Source Precedence rules and notices unexpected attribute overwrites. Which THREE of the following conditions or settings can influence how Data Source Precedence behaves? (Choose three.)

Accepted Answer

The exact case-sensitive string value used for the discovery source in the payload.. Option A is correct because Data Source Precedence matches the discovery source by the exact case-sensitive string value supplied in the payload, so a mismatch in casing or spelling causes the rule not to apply and attributes may be overwritten unexpectedly. Option B is correct because precedence handling depends on whether the payload provides values for empty or null attributes; if a lower-priority source sends a null or empty value and the rule does not account for it, the existing value can be cleared or overwritten. Option E is correct because precedence rules can be defined at the parent class level and overridden at a child class level, and the effective rule for the CI's actual class determines which source wins. Option C is not relevant because the number of active user sessions has no effect on Data Source Precedence evaluation. Option D is not relevant because identification rule criteria determine CI matching and creation, not the precedence logic that decides which source's attribute value is retained.

Answer

The number of active user sessions currently logged into the ServiceNow instance.

Answer

Whether the attribute being updated is included in the class's identification rule criteria.

Question 8

An organization is using ServiceNow Discovery to populate servers, but they also have an automated script that injects server maintenance windows into a custom attribute on the server CIs via the IRE. The automated script runs every 15 minutes, whereas Discovery runs nightly. The administrator notices that the maintenance window attribute is frequently wiped out after the nightly Discovery run. What is the most effective way to protect the maintenance window attribute from being overwritten?

Accepted Answer

Configure a Data Source Precedence rule giving the custom script's discovery source a higher priority than 'ServiceNow' for the maintenance window attribute.. Data Source Precedence rules allow you to specify which discovery source has priority for specific attributes. By giving the custom script's discovery source higher priority than 'ServiceNow' for the maintenance window attribute, the script's value will not be overwritten by Discovery.

Answer

Disable the maintenance window field mapping in the Discovery schedule properties.

Answer

Set the Discovery schedule to run before the custom script.

Answer

Remove the maintenance window attribute from the cmdb_ci table dictionary.

Question 9

A CMDB administrator is configuring a Service Graph Connector for Microsoft Azure to ingest virtual machines. They need to ensure that when a VM is deleted in Azure, the corresponding CI in ServiceNow is marked as absent rather than immediately deleted. Which setting should they configure in the Service Graph Connector?

Accepted Answer

Set the 'Absence detection' option to 'Mark as absent'.. The Service Graph Connector for Azure includes a built-in absence detection capability. Setting it to 'Mark as absent' ensures that when a VM is no longer discovered in Azure, the corresponding CI is not deleted but flagged as absent. This preserves historical data and relationships while accurately reflecting the VM's status.

Answer

Configure a scheduled job to run a script that sets the 'install status' to 'Retired'.

Answer

Modify the IRE identification rule to ignore missing CIs.

Answer

Enable the 'Delete' operation in the connector's data mapping.

Question 10

An administrator is preparing to ingest data from a third-party system into the CMDB using a REST API. They want to ensure that the Identification and Reconciliation Engine (IRE) is invoked during the ingestion process. Which TWO methods should they use? (Choose two.)

Accepted Answer

Use the 'CMDBIdentificationAndReconciliation' Scripted REST API endpoint.. The CMDB API with 'sysparm_ire=true' and the CMDB Identification and Reconciliation Scripted REST API endpoint both explicitly invoke IRE during ingestion. These methods are designed for API-based integrations and ensure that incoming data is processed through IRE, maintaining CMDB integrity.

Answer

Use a Scheduled Data Import with a Transform Map that has 'Coalesce' enabled.

Answer

Create an Import Set with a Transform Map that uses the 'IRE' transform script.

Answer

Use the 'IdentificationEngine' JavaScript API directly in a business rule.