1Z0-1127-25 LangChain and AI Application Development Practice Question
Which LangChain memory type stores the entire conversation history as a list of messages and is best for simple, short conversations?
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
✓
ConversationBufferMemory
ConversationBufferMemory stores the full history, making it suitable for short dialogues but not for long ones due to token limits.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ConversationTokenBufferMemory
Why it's wrong here
TokenBufferMemory limits history by token count.
- ✗
ConversationSummaryMemory
Why it's wrong here
SummaryMemory compresses history into a summary, not a full buffer.
- ✓
ConversationBufferMemory
Why this is correct
BufferMemory stores the complete list of messages.
- ✗
ConversationBufferWindowMemory
Why it's wrong here
WindowMemory keeps only the last k messages.
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