Twenty questions, two per lesson. Answer all of them to reveal your grade. No peeking at the lessons — this is the retrieval practice that makes the material stick.
🧠 Grand Quiz
The Map & LangChain
1. Which layer does the Langfuse platform occupy?
2. Who makes LangGraph?
3. What abstraction lets you swap OpenAI for Anthropic with minimal code change?
4. Which package holds the core interfaces?
LCEL & LangGraph
5. What does chain.with_fallbacks([...]) do?
6. LCEL's biggest limitation is…
7. What does the add_messages reducer do in LangGraph state?
8. Which LangGraph feature pauses execution for human approval and resumes later?
Observability
9. Which of these is a LangSmith feature?
10. How do you enable LangSmith tracing on a LangChain app?
11. Which statement about Langfuse is true?
12. What makes observability platforms interchangeable?
13. Which scenario favors Langfuse over LangSmith?
14. Which observability tool operates as a proxy in front of model APIs?
Serving, Memory & Swapping
15. LangServe is best suited for…
16. Which capability belongs to the LangGraph Platform but not LangServe?
17. What does LangMem add on top of LangGraph's checkpointer?
18. Short-term memory in LangGraph is scoped by…
19. When should you skip LangChain and use a plain SDK?
20. Which framework is the strongest alternative for RAG/ingestion-heavy apps?