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ServiceNow CIS-Discovery Sample Question Answers
Question # 1
Which of the following executes the osquery commands on agents to gather attribute details from a
CI?
A. Agent Collector B. Agent listener C. ACC for Discovery D. Check Definitions E. Policies
Answer: A
Explanation:
Agent Collector is the component that executes the osquery commands on agents to gather attribute
details from a CI. Agent Collector is a feature of the Agent Client Collector (ACC) for Discovery, which
is an integration that enables ServiceNow Discovery to use osquery to collect data from Linux and
Windows devices that have the Elastic Agent installed1. Agent Collector allows you to define osquery
queries and assign them to policies that target specific devices or groups of devices2. Agent Collector
then runs the queries on the agents and sends the results back to the instance, where they are
processed by the Agent Listener and stored in the CMDB3.
Reference: 1: Agent Client Collector for Discovery - ServiceNow 2: Create an Agent Collector policy -
ServiceNow 3: Agent Client Collector for Discovery architecture - ServiceNow
Question # 2
From an SNMP Query pattern operation, which of the choices are valid Variable Types? (Choose two.)
A. Test B. Table C. Scalar D. CI Type
Answer: B, C
Explanation:
The SNMP Query pattern operation executes an SNMP query on a target device and stores the results
in a variable. The Variable Type field determines the format of the results. There are two valid
Variable Types for this operation: Table and Scalar. Table is used when the query returns multiple
values, such as a list of interfaces or processes. Scalar is used when the query returns a single value,
such as the system name or uptime12.
Reference:
SNMP Query pattern operation - Product Documentation: San Diego - Now Support Portal
SNMP Query pattern operation - Product Documentation: Vancouver - ServiceNow
Which of the following choices explain differences between Service Mapping and Discovery? (Choosetwo.)
A. Discovery requires agent installation to find hardware devices, Service Mapping requires agentsfor software. B. Discovery finds applications and devices on your network, Service Mapping monitors thosedevices. C. Discovery utilizes IP address ranges for initial discovery, Service Mapping uses entry points. D. Discovery addresses inventory-related use-cases, while Service Mapping allows for the creation ofaccurate maps of application service topologies.
Answer: C, D
Explanation:
Discovery and Service Mapping are both products that help to identify and map the IT infrastructure
and services in an organization. However, they have different approaches and objectives. Discovery
uses IP address ranges as the starting point for finding devices and applications on the network, and
then runs probes and sensors to collect information and classify them. Discovery focuses on
inventory-related use-cases, such as asset management, configuration management, and
compliance. Service Mapping uses entry points, such as URLs or host names, as the starting point for
mapping business services and their dependencies. Service Mapping runs patterns, which are
sequences of operations that follow the traffic connections between devices and applications, and
then creates a service map that shows the logical and semantic relationships. Service Mapping
focuses on service-related use-cases, such as service availability, impact analysis, and root cause
analysis12.
Reference:
1: ServiceNow Discovery Overview, page 9
2: ServiceNow Discovery Documentation, Service Mapping section
What entry point type must a horizontal pattern have to execute from a process classifier?
A. A subnet entry point type. B. HTTP(S) entry point type if the pattern is running on a web server application. C. TCP entry point type or ALL entry point type. D. It does not matter, it is triggered for all entry point types.
Answer: C
Explanation:
A horizontal pattern must have a TCP entry point type or an ALL entry point type to execute from a
process classifier. A process classifier is a rule that matches a process running on a host and triggers a
horizontal pattern to discover the application associated with that process1. The entry point type
determines the type of connection that the pattern uses to access the target host. A TCP entry point
type means that the pattern uses a TCP port to connect to the host, while an ALL entry point type
means that the pattern can use any available connection method2.
Reference:
1: Process classifiers - Product Documentation: San Diego - ServiceNow
2: Horizontal Pattern probe - Product Documentation: San Diego - ServiceNow
Which of the following are contained in an extension section of a discovery pattern?
A. Connection sections B. Network libraries C. Identification sections D. Shared libraries
Answer: D
Explanation:
An extension section of a discovery pattern is a section that allows you to modify or extend the
functionality of an existing pattern without customizing it. An extension section can contain shared
libraries, which are reusable code snippets that can be invoked from any pattern or extension
section. Shared libraries can be used to define common functions, variables, or constants that are
used across multiple patterns or extension sections. Shared libraries can also be used to override the
default behavior of some built-in functions, such as identification or classification12. Reference = 1:
ITOM: Extending Discovery/Service Mapping Patterns - GlideFast ServiceNow 2: How to Create
Discovery Pattern Extensions and Why to Use Them
Question # 14
Given a custom column named u_custom_column on table cmdb_ci_linux_server, which variablesyntax should be used to populate the column in a horizontal discovery pattern using the SetParameter Value operation?
A. $user_var_custom_column B. $cmdb_ci_linux_server.u_custom_column.INSERT C. $u_custom_column[1].cmdb_ci_linux_server D. $cmdb_ci_linux_server[*].u_custom_column
Answer: B
Explanation:
The correct variable syntax to populate a custom column in a horizontal discovery pattern
is $cmdb_ci_linux_server.u_custom_column.INSERT. This syntax indicates that the value of the
custom column will be inserted into the cmdb_ci_linux_server table for the current CI. The other
options are either invalid or incorrect syntaxes for this operation12.
Reference:
Set Parameter Value operation
Pattern variables
Question # 15
File-based Discovery is triggered during the .
A. Classify Phase B. Scan Phase C. Exploration Phase D. Pattern Phase E. Identification Phase
Answer: C
Explanation:
File-based Discovery is a process that helps identify what software is running on your Windows and
UNIX servers and devices, even if there is no registration information available. File-based Discovery
is triggered in the exploration phase of normal Discovery, after the target device has been classified
and identified. File-based Discovery probes execute a scan searching for specific file extensions or file
names in paths that you configure. The resulting file information is returned in the probe payload.
The sensor attempts to match the discovered files with installed software, using the file name, size,
and version returned by the probe.
Reference: File-based Discovery, File Based Discovery - Support and Troubleshooting
In a pattern operation, which of the following correctly calls the value of the executableDir variable
from the tabular process variable?
A. process(executableDir) B. "process_executableDir" C. $process_executableDir D. $process.executableDir
Answer: D
Explanation:
The $process.executableDir expression correctly calls the value of the executableDir variable from
the tabular process variable. The process variable is a tabular variable that contains the output of the
ps command, which lists the processes running on a CI. The executableDir variable is a column name
that holds the directory path of the executable file for each process. To access the value of a column
name from a tabular variable, you need to use the dot notation, such as $variable.columnName12.
Reference
1: Pattern variables - Product Documentation: Tokyo - Now Support Portal
2: Examples of EVAL scripts used in Discovery patterns - ServiceNow
Question # 19
Which choice best describes how to use a Behavior for discovery?
A. The MID Server selection method on a Discovery Schedule. B. The Behavior drop-down menu on a Discovery IP Range. C. The Behavior drop-down menu on a Discovery Status. D. The Behavior checkbox on a CI.
Answer: B
Explanation:
A Behavior is a set of rules that determines which MID Servers launch which types of probes during
a Discovery1. It can be assigned to a Discovery IP Range, which is a range of IP addresses that
Discovery scans for CIs2. By using the Behavior drop-down menu on a Discovery IP Range, one can
control how Discovery behaves for each IP address in that range3. The other options are not related
to using a Behavior for discovery. The MID Server selection method on a Discovery Schedule is a way
to specify which MID Servers are eligible to run Discovery for a given schedule4. The Behavior dropdown
menu on a Discovery Status is a way to filter the Discovery Status records by the Behavior used.
The Behavior checkbox on a CI is a way to indicate whether the CI was discovered using a Behavior or
not.
Reference: 1: Discovery behaviors 2: Discovery IP ranges 3: Assign a behavior to an IP range 4: MID
Server selection method : Discovery Status : Behavior field on the cmdb_ci table
Which choice allows the following functionality to occur?If this value is set to 1000 and a discovery must scan 10,000 IP addresses using a single MID Server, itcreates 10 Shazzam probes with each probe scanning 1000 IP addresses.
A. MID Server Clusters B. MID Server selection method C. Shazzam Batch Size D. Behaviors
Answer: C
Explanation:
The Shazzam Batch Size property determines how many IP addresses are scanned by a single
Shazzam probe1. If this value is set to 1000 and a discovery must scan 10,000 IP addresses using a
single MID Server, it creates 10 Shazzam probes with each probe scanning 1000 IP addresses. This
property can be configured in the Discovery Properties module under Discovery Definition2.
Reference: 1: Shazzam probe, port probes, and protocols - Now Support 2: [Discovery properties -
ServiceNow]
Question # 21
The deletion strategy is set to 'Mark as absent' for related Disk Cls discovered via the Linux Server
pattern. If a related Disk Cl is discovered during the Linux Server discovery and then the same related
Disk CI is not found the next time the Linux Server is discovered, the following will happen:
A. The Linux Server CI Status (install_status) is set to Absent. B. The Disk Status CI (install_status) is set to Absent. C. The Disk CI Operational Status (operational_status) is set to Non-Operational. D. The Linux Server CI Operational Status (operational_status) is set to Non-Operational.
Answer: B
Explanation:
The deletion strategy ˜Mark as absent means that when a related CI that was previously discovered
by a pattern is no longer found, the install_status attribute of that CI is set to Absent. This indicates
that the CI is missing or removed from the network. The main CI (in this case, the Linux Server CI) is
not affected by the deletion strategy of the related CI (in this case, the Disk CI)12.
Reference
1: Set a deletion strategy - Product Documentation: San Diego - ServiceNow
2: Network adapter status setting to œAbsent in EMC ¦ - ServiceNow ¦
Question # 22
Discovery finds and maps dependencies for the following types of storage devices. (Choose three.)
A. Direct-attached storage (DAS) B. Network-attached storage (NAS) C. Storage area network (SAN) D. Multiple area network (MAN) E. Redundant Array of Independent Disks (RAID)
Answer: ABC
Explanation:
Discovery finds and maps dependencies for the following types of storage devices: Direct-attached
storage (DAS), network-attached storage (NAS), or storage area network (SAN)1. NAS or SAN storage
that is discovered via a Storage Management Initiative Specification (SMI-S) and Common
Information Model (CIM) is also supported2. Discovery collects information about storage area
networks from specialized devices, such as storage arrays and Fibre Channel (FC) switches, and
creates specific references between the tables in the SAN3. Discovery does not support Multiple area
network (MAN) or Redundant Array of Independent Disks (RAID) as types of storage devices.
Reference:
1: Storage device discovery
2: Storage Discovery via SMI-S and CIM
3: Discovery of storage area networks (SAN)
Question # 23
While discovering a new SNMP network device, which choice could cause the error ˜Active, couldn't classify" to occur on a Discovery Status?
A. SNMP credentials are incorrect. B. SNMP only behavior is not configured. C. A firewall blocking the communication between the MID Server and the target device. D. An SNMP Classification must be updated or created for the new device.
Answer: D
Explanation:
In ServiceNow Discovery, when encountering the error 'Active, couldn't classify' during the discovery
of a new SNMP network device, it typically indicates an issue with the classification process.
Classification is a crucial initial step in the Discovery process, where the system determines the type
of device it is interacting with. If an SNMP Classification rule for the new device type does not exist or
needs updating, Discovery will be unable to classify and thus properly discover the device. Incorrect
SNMP credentials or firewall issues usually result in different types of errors, such as authentication
failures or no response from the device.
Question # 24
Which method is used by Discovery to determine if a Host IP is active or alive?
A. Port Scan B. Traceroute C. Ping D. Classification
Answer: C
Explanation:
Discovery uses the ping method to determine if a host IP is active or alive. Ping is a network utility
that sends an ICMP echo request packet to a target IP address and waits for an ICMP echo reply
packet. If the target IP address responds, it means that the host is active or alive12.
Reference:
1: ServiceNow Discovery Documentation, Discovery Process section
2: ServiceNow Discovery Overview, page 8
Question # 25
A Discovery Schedule contains a subnet IP Range and a Shazzam batch size of 5000. How manytimes will a Shazzam probe be launched during discovery?
A. 1 B. 2 C. 5000 D. 254
Answer: C
Explanation:
A subnet IP Range means that there are 256 possible IP addresses in the range, from 0 to 255. A
Shazzam batch size of 5000 means that Discovery will send 5000 ICMP packets at a time to scan the
IP addresses. Therefore, Discovery will launch the Shazzam probe once for every 5000 IP addresses in
the range, or 256 / 5000 = 0.0512 times. Since the number of times must be an integer, Discovery will
round up to 1 and launch the Shazzam probe once. However, since the Shazzam probe is launched for
each MID Server that is assigned to the Discovery Schedule, the actual number of times will depend
on how many MID Servers are available. If there are N MID Servers, then the Shazzam probe will be
launched N times, each sending 5000 ICMP packets to the same IP range. Therefore, the total
number of times that the Shazzam probe will be launched during discovery is N * 1 = N.
Reference:
Discovery Schedule form
Shazzam Probe
Discovery IP range
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