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YAML

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

YAML is a human-readable text-based data serialization format that represents structured information using indentation and concise syntax.

YAML is a human-readable data serialization format for converting structured application data into a form suitable for storage, transmission, and reconstruction by another application. section 24.1

YAML emphasizes readability through concise syntax. Significant whitespace means indentation defines data structure and hierarchy rather than merely improving visual formatting. section 24.3.2

---
wirelessAccessPoint:
 name: AP350
 location: Office Floor 3
 operatingMode: dual-band
 ssids:
   - name: OfficeWiFi-2G
     band: 2.4GHz
     maxClients: 30
   - name: OfficeWiFi-5G
     band: 5GHz
     maxClients: 50

Read the indentation-based YAML representation of a wireless access point, including nested SSIDs and client limits. section 24.3.2

Same data, different formats

A wireless access-point data structure can be represented in YAML, JSON, or XML. YAML uses indentation and minimal punctuation, whereas JSON uses braces, commas, and brackets and XML uses tags. section 24.3.2

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Defines YAML’s naming, readability, and indentation behavior, but stops short of detailed syntax or parser internals.
Examples
Uses a wireless access-point structure with nested SSIDs, bands, and maximum-client values.
What it assumes
Introduces data serialization as conversion for storage or transmission before contrasting YAML with JSON and XML.
What you can do after
Evaluate YAML representations by recognizing indentation-defined hierarchy and comparing their readability with JSON and XML.
How it connects
Compares YAML with data serialization, JSON, and XML.
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