CIS-ITSM CMDB — 10 Questions

Question 1

An organization requires that network gear attributes can only be updated by the Network Discovery data source, while server attributes can be updated by both Discovery and a manual import set. Where must this restriction be configured?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Reconciliation Definitions. Reconciliation Definitions are used to specify which data source can update which attributes on a CI. By configuring reconciliation definitions, you can set rules that allow only the Network Discovery data source to update network gear attributes, while allowing both Discovery and manual import sets to update server attributes. This provides granular control over attribute-level data source precedence.

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Access Control Lists (ACLs)

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CI Class Manager Identification Rules

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Data Source Precedence Rules

Question 2

An administrator needs to ensure that network gear discovered by Discovery is classified under a specific custom child table of cmdb_ci_netgear. Where should the administrator define the classification criteria to map network devices to this custom table?

Accepted Answer

CI Class Manager. The CI Class Manager is the central console in ServiceNow for managing the CMDB class hierarchy, including creating custom child classes and defining the identification and reconciliation rules that determine which class a discovered CI is placed into. When Discovery finds a network device, the classification criteria (such as SNMP sysObjectID, sysDescr patterns, or other attributes) defined in CI Class Manager determine whether the CI lands in cmdb_ci_netgear or a custom child table. This makes CI Class Manager the correct place to map discovered network gear to a custom child table.

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Discovery Definition > Network Classifications

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CMDB Properties

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CI Identifier Rules module

Question 3

During an import of server CIs, duplicate records are being created because different data sources send serial numbers in different cases (uppercase vs lowercase). Which configuration in Identification and Reconciliation Engine (IRE) will prevent this issue?

Accepted Answer

Enable case-insensitive matching on the identifier entry for the Serial Number attribute.. The Identification and Reconciliation Engine (IRE) allows each identifier entry (such as Serial Number) to be configured with a 'case insensitive' flag. When enabled, IRE normalizes the incoming value before matching, so 'ABC123' and 'abc123' resolve to the same CI instead of creating two records. This is the correct, targeted fix because the duplication is caused purely by case variance in the identifier value.

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Create a custom CMDB Data Manager policy to merge duplicates automatically.

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Set the Reconciliation Rule to discard updates from the secondary data source.

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Modify the Identification Rule weight to a higher number.

Question 4

An organization defines a multi-attribute identification rule for the Linux Server class using 'serial_number' and 'ip_address'. During a payload execution, the IRE finds an existing CI matching the serial number, but the IP address has changed. How does the IRE process this payload?

Accepted Answer

It updates the existing CI's IP address and any other payload attributes, treating it as the same physical asset based on the matching rule entry.. The IRE uses multi-attribute identification rules to determine if a payload matches an existing CI. When multiple attributes are defined, the rule is satisfied if any one of the attributes matches (OR logic). Here, the serial number matches an existing CI, so the IRE treats the payload as the same CI and updates the CI's attributes—including the changed IP address—with the new values from the payload. This ensures the CMDB reflects the current state of the asset without creating duplicates.

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It flags the payload in the IRE Error Dashboard as an identification conflict requiring manual resolution.

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It creates a new CI record because the IP address attribute does not match the historical value.

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It deletes the existing CI and inserts a new one with the updated attributes.

Question 5

An engineer needs to add a custom attribute called 'Rack Number' to all Linux Server CIs. Where should this modification be performed to ensure it applies correctly to the table hierarchy?

Accepted Answer

CI Class Manager. CI Class Manager is the correct place to add a custom attribute to all Linux Server CIs because it manages the CI class hierarchy and allows attributes to be added at the appropriate class level, ensuring inheritance to child classes. Adding the attribute via CI Class Manager on the Linux Server class ensures it applies correctly across the hierarchy. This is the ServiceNow-recommended approach for extending CI classes.

Answer

Table Builder on cmdb_ci_linux_server

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System Definition > Custom Fields

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Dictionary Editor on cmdb_ci

Question 6

A team is importing asset and CI data from an external asset management tool. They want to ensure that when a CI is deleted in the external tool, it is also deleted in the ServiceNow CMDB. Which IRE payload setting accomplishes this?

Accepted Answer

Including 'operation': 'delete' in the IRE payload structure for the target CI.. The IRE (Identification and Reconciliation Engine) payload supports an 'operation' field that explicitly tells the engine what action to take on the target CI. Setting 'operation': 'delete' instructs IRE to delete the specified CI from the CMDB, which is the correct way to propagate a deletion from an external source. This is a direct, payload-level instruction rather than a rule or transform map behavior.

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Setting the Reconciliation Rule action to 'Cascade Delete'.

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Enabling 'Auto-Delete' on the Data Source transform map properties.

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Configuring the CI Class Manager to purge orphans automatically.

Question 7

An administrator creates a custom identification rule for a new class. The rule has two entries: Entry 1 uses 'serial_number' (weight 100), and Entry 2 uses 'mac_address' (weight 50). When a payload arrives containing both attributes, how does the IRE evaluate the rule entries?

Accepted Answer

The IRE evaluates Entry 1 first. If a match is found, it uses that CI; if no match is found, it proceeds to evaluate Entry 2.. IRE evaluates identification rule entries in order of their priority or weight, or matches using the first matching entry based on configuration criteria.

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The IRE averages the weights and creates a new CI if the combined score is below 75.

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The IRE rejects the payload because conflicting matching criteria are defined within the same rule.

Question 8

A business service map displays a critical application server as disconnected from its underlying database. Upon investigation, the database CI was updated with a new IP address, breaking the relationship. Which ServiceNow feature helps automatically maintain relationships when attributes change?

Accepted Answer

Identification and Reconciliation Engine relationship processing via Discovery patterns. Service Mapping and Discovery rely on IRE and pattern synchronization, but relationship maintenance is often preserved through automated discovery or reference qualifier linkage. When considering CMDB core mechanisms, IRE handles updates, and relationship rules or dynamic CI groups maintain groupings.

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Dependency View Auto-Heal Business Rule

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Dynamic CI Group query rules

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CMDB Data Manager relationship synchronizer

Question 9

Which TWO of the following are core components evaluated by the CMDB Health Dashboard? (Choose two.)

Accepted Answer

Completeness. CMDB Health consists of three pillars: Completeness, Correctness, and Compliance.

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Security

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Availability

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Performance

Question 10

Which TWO of the following tables are standard base or parent tables in the CMDB hierarchy? (Choose two.)

Accepted Answer

cmdb_rel_ci. cmdb and cmdb_ci are foundational parent tables for all configuration items and related metadata in ServiceNow.

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sys_user

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incident

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ast_contract