SERVICENOW-CIS-DISCOVERY Discovery Pattern Design Practice Test 3 — 15 Questions

Question 1

You are modifying a pattern and need to extract a specific attribute from a JSON response returned by an API. Which step type is most appropriate for this task?

Accepted Answer

Parse JSON. The Parse JSON step type is purpose-built to parse a JSON payload and extract specific attributes by navigating the JSON structure using JSONPath or dot notation. When a pattern receives an API response in JSON format, Parse JSON lets you map individual fields (e.g., $.data.id) into variables that subsequent steps can use. This is the correct and most efficient way to pull a specific attribute from a JSON response.

Answer

Parse Variable

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Set Parameter

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Regex Extract

Question 2

You are creating a pattern to capture a version number from a command line output. The output is 'Version: 1.2.3.4'. Which parsing strategy is most efficient for this specific string?

Accepted Answer

Regex parsing. Regex is the standard tool for extracting specific patterns from a single line of text.

Answer

Name-Value pair parsing

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Delimiter parsing

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XML parsing

Question 3

Which action allows you to test a pattern against a specific Discovery status record without running a full Discovery scan?

Accepted Answer

Pattern Designer Test mode. Pattern Designer's Test mode lets you execute a pattern against a specific Discovery status record (a saved Discovery log entry) and step through each step to inspect inputs/outputs, without scheduling or running a full Discovery. This is the standard debugging workflow for pattern development in ServiceNow Discovery. It isolates the pattern logic from the broader Discovery run so you can iterate quickly.

Answer

Modify Discovery Schedule

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Submit a change request

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Re-run Discovery

Question 4

When configuring a 'Set Parameter' step, where is the value retrieved from if you select 'Variable'?

Accepted Answer

From a memory variable created earlier in the pattern.. A 'Variable' parameter type retrieves its value from a previously defined variable in the pattern session.

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From the MID server configuration.

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From the CMDB table.

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From a system property.

Question 5

When dealing with a nested XML response from an API, which parsing method should be used to drill down into a specific child node?

Accepted Answer

Parse XML with XPath. XPath is the standard query language for navigating XML documents and drilling into specific child nodes by path expression (e.g., /root/parent/child). ServiceNow's 'Parse XML with XPath' step is purpose-built for extracting values from nested XML API responses. It handles namespaces, attributes, and hierarchical traversal that flat parsers cannot.

Answer

Parse Delimited Text

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Parse JSON

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Parse Name-Value pair

Question 6

What happens if a pattern execution encounters an error in a step that is marked as 'Continue on error'?

Accepted Answer

The pattern proceeds to the next step in the sequence.. The 'Continue on error' flag allows the discovery to proceed to the next step despite failure.

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The error is logged, and the pattern restarts.

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The entire pattern execution stops.

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The pattern skips to the next section.

Question 7

Which of the following is the correct order of operations in a horizontal pattern?

Accepted Answer

Identification, Connection, Extension. The standard flow is Identification, then Connection, then Extension sections.

Answer

Connection, Identification, Extension

Answer

Identification, Extension, Connection

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Extension, Identification, Connection

Question 8

What is the benefit of using an Extension section in a pattern?

Accepted Answer

To allow for modularity and reuse of logic.. Extension sections promote code reusability across multiple patterns.

Answer

To bypass the need for identification.

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To increase the execution speed.

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To automatically update CMDB schemas.

Question 9

When should you use the 'Lookup' step in a pattern?

Accepted Answer

To retrieve data from an existing CMDB record.. The 'Lookup' step in a pattern is used to retrieve data from an existing CMDB record. It allows you to query the CMDB for a CI based on certain criteria and then use the returned data in subsequent steps. This is useful for correlating discovered data with existing records or for populating related fields.

Answer

To create a new CI.

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To delete a CI.

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To identify the primary CI.

Question 10

Which UI tool is used to visualize the pattern execution flow?

Accepted Answer

Pattern Designer. The Pattern Designer includes a graphical interface that displays the steps and flow of the pattern.

Answer

Discovery Dashboard

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Service Mapping view

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CI Class Manager

Question 11

What is the purpose of the 'Pre-sensor' script?

Accepted Answer

To perform custom logic before the payload is processed.. Pre-sensor scripts allow developers to manipulate data before it is processed by the identification engine.

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To stop a pattern from running.

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To reset the MID server cache.

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To run commands on the target device.

Question 12

When using the 'Parse Delimited' step, what is the 'Separator' attribute used for?

Accepted Answer

To define the character that splits the data fields.. The separator defines the character (e.g., comma, pipe) that splits the columns in the text.

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To define the row identifier.

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To identify the end of the file.

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To escape special characters.

Question 13

What happens to the data extracted by a pattern if it is not mapped to an attribute?

Accepted Answer

It is discarded.. If data extracted by a pattern is not mapped to an attribute, it is discarded. ServiceNow Discovery only retains data that is explicitly mapped to a CI attribute or used in a step; unmapped data is not stored.

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It is kept as a temporary CI.

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It is stored in the error table.

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It is saved in the discovery log.

Question 14

You are parsing a multi-line string containing key-value pairs separated by colons. Which tool is most appropriate for a single step extraction?

Accepted Answer

Parse Name-Value pair. The 'Parse Name-Value pair' step is designed to automatically extract multiple key-value pairs from a text block.

Answer

Regex

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Parse Delimited

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XPath

Question 15

You want to run a command only if a previous step was successful. How is this configured?

Accepted Answer

Using a 'Pre-condition' on the step.. You can use the 'Condition' field on a step to check the state of previous steps.

Answer

This is not possible.

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Using an Extension section.

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Using a 'Wait' step.