Home
Guardian
User Guide
Information and resources about the main features of Guardian, and the tasks that you can do from the user interface (UI).
Queries
Queries
You can use the Nozomi Networks Query Language (N2QL) syntax to create complex data processes to obtain, filter, and analyze lists of information from the Nozomi Networks software.
Examples
Pie chart
An example on how to create a pie chart to understand the media access control (MAC) vendor distribution in a network.

Guardian
- Introduction
  An overview of Guardian.
- Installation Guide
  Information and resources on how to install Guardian, and the different options and settings that are available.
- Administrator Guide
  Information and resources about the Administration section of Guardian, and the tasks that you can do in this part of the software.
- User Guide
  Information and resources about the main features of Guardian, and the tasks that you can do from the user interface (UI).
  - Sensors
  - Alerts
  - Assets
  - Queries
    - Queries
      You can use the Nozomi Networks Query Language (N2QL) syntax to create complex data processes to obtain, filter, and analyze lists of information from the Nozomi Networks software.
      - Data sources
      - Basic operators
      - Commands
      - Functions
      - Examples
        Pie chart
        An example on how to create a pie chart to understand the media access control (MAC) vendor distribution in a network.
        Column chart
        An example on how to create a column chart with the top nodes by traffic.
        Where with multiple conditions in OR
        An example of a query to get all the nodes with a specific role, in particular all the nodes which are web or domain name server (DNS) servers.
        Bucket and history
        An example of a query to calculate the distribution of link events towards an internet protocol (IP) address.
        Join
        An example query to join two data sources to obtain a new data source with more information. In particular, how to list the links with the labels for the source and destination nodes.
        Compute the availability history
        An example query to compute the availability history for a link.
        Complex field types
  - Smart Polling
  - Arc
  - Network
  - Process
  - Reports
  - Assertions
  - Time machine
  - Vulnerabilities
  - Administration
  - Personal settings
- Maintenance Guide
  Information about the maintenance tasks of Guardian, to help you administer and maintain the solution in a production environment.
- Print format documentation
  A list of all the print-format documentation that is available for Guardian.

Pie chart

An example on how to create a pie chart to understand the media access control (MAC) vendor distribution in a network.

We choose nodes as our query source and we start to group the nodes by mac_vendor:

nodes | group_by mac_vendor

We can see the list of the vendors in our network associated with the occurrences count. To better understand our data we can use the sort command, so the query becomes:

nodes | group_by mac_vendor | sort count desc

In the last step we use the pie command to draw the chart with the mac_vendor as a label and the count as the value.

nodes | group_by mac_vendor | sort count desc | pie mac_vendor count