350-601 Automation Practice Question
A Python script using the pyATS framework to parse 'show interface' output on a Nexus 9000 switch fails with a parsing error, even though the CLI command runs successfully. What is the most likely missing component?
⚠ Common exam trap
Cisco often tests the distinction between command execution success and parsing success, trapping candidates who assume a working CLI command guarantees pyATS/Genie parsing will work without the correct version-specific parser installed.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Genie parser for the specific NX-OS version is not installed or imported.
The pyATS framework relies on Genie parsers to convert raw CLI output into structured data. If the Genie parser for the specific NX-OS version is missing or not imported, the script cannot parse the 'show interface' output, resulting in a parsing error even though the CLI command itself runs successfully. This is the most likely missing component because pyATS/Genie parsers are version-specific and must be installed for the exact platform and OS version.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The script does not include the correct authentication method.
Why it's wrong here
Authentication failure would prevent the CLI command from running at all, not cause a parse error.
- ✓
The Genie parser for the specific NX-OS version is not installed or imported.
Why this is correct
pyATS uses Genie parsers that are version-specific; missing parser leads to parse error.
- ✗
The script uses the wrong device type (e.g., iosxe instead of nxos).
Why it's wrong here
Wrong device type would cause connection issues, but not specifically a parsing error after successful command execution.
- ✗
The switch is not configured with NETCONF.
Why it's wrong here
pyATS works over CLI (ssh) and does not require NETCONF for parsing show commands.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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