hardMultiple ChoiceObjective-mapped
200-901 Practice Question: A developer is using Cisco NSO to create a service
A developer is using Cisco NSO to create a service. They are evaluating whether to use Python or Java for plan callbacks. Which consideration is most important?
⚠ Common exam trap
Cisco often tests the misconception that Python is the only or primary language for NSO customizations, when in fact both Python and Java are fully supported, and the choice depends on factors like library availability and developer expertise, not exclusivity or raw performance.
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
✓
Both are equally supported, but Python has more extensive libraries for networking
Cisco NSO supports both Python and Java for plan callbacks, and the choice between them often hinges on the developer's familiarity and the specific requirements of the service. Python is particularly favored in many networking contexts due to its extensive ecosystem of libraries (e.g., for NETCONF, RESTCONF, or SNMP), which can accelerate development. However, Java is equally supported and may be chosen for performance-critical or deeply integrated components within NSO's Java Native Interface (JNI).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Java is preferred due to better integration with NSO's internal data model
Why it's wrong here
Both have equivalent integration capabilities.
- ✗
Python is the only supported language for custom service code in NSO
Why it's wrong here
NSO supports both Python and Java.
- ✓
Both are equally supported, but Python has more extensive libraries for networking
Why this is correct
Python's rich ecosystem and readability make it a common choice.
- ✗
Python is preferred due to faster execution
Why it's wrong here
Python is generally slower than Java for execution.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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