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ServiceNow Discovery – Basics Latest
2024 Graded A
Discovery finds computers, servers, printers, and a variety of IP-enabled devices, and the applications that run on them. It can then update the CIs in your CMDB with the data it collects.
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What are the two types of discovery? ✔✔Horizontal Discovery & Top-down Discovery
Horizontal discovery
The Discovery application performs horizontal discovery, which means that it finds devices on your network and several attributes about those devices including the operating system, software, memory, and so on. It can also establish relationships between the applications and the device, and between applications. But it does not draw relationships between CIs that are part of specific
business services. ✔✔
Top-down discovery
Top-down discovery, which is a technique used by Service Mapping, finds and maps CIs that are part of business services in your organization, such as an email service. Service Mapping actually utilizes horizontal discovery to find devices in the scanning and classification phases,
and top-down discovery to map business services. ✔✔
What components are used to explore computers and devices (hosts)? ✔✔Probes & Sensors, and
Patterns
Probes and sensors
Probes and sensors are scripts that collect data on the host, process it, and update the CMDB. Several probes and sensors are provided out of box, but you can also customize them and create custom ones. You can also configure parameters to control the behavior of a particular probe every time it is triggered. A base set of probes and sensors is always used in the first two stages of Discovery. If you are not using patterns, additional probes and sensors are used to identify and explore hosts and the software that runs on them (see Discovery phases). ✔✔
Patterns
Patterns are a series of operations that also collect data on a host, process it, and update the CMDB, just as probes and sensors do. Patterns differ from probes and sensors in that they are written in Neebula Discovery Language (NDL) rather than JavaScript, and they are called into action during the last two phases of Discovery. Default patterns are provided, but you can
customize or create new patterns using the Pattern Designer. See Create or modify patterns. ✔✔
