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AIF-C01 Practice Question: Using Amazon Bedrock Agents to build a travel…
A company is using Amazon Bedrock Agents to build a travel booking assistant that can search for flights, book hotels, and answer questions about travel policies. Which TWO components are required to enable the agent to call external services? (Select TWO.)
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
✓
Action group with API schema
Option A (Action group with API schema) is correct because an action group defines the set of tasks the Bedrock Agent can perform and includes an OpenAPI schema that describes the external APIs the agent can invoke, which is the mechanism for calling external services. Option B (AWS Lambda function) is correct because Bedrock Agents use Lambda functions as the compute layer to execute the business logic for action groups, receiving the agent's request and returning the API response. Option C (Amazon DynamoDB table) is not required; it is only a possible data store for the Lambda function's implementation, not a component that enables external service calls. Option D (Amazon SageMaker endpoint) is not required; it is used for hosting custom ML models, not for enabling agent action groups. Option E (Bedrock Knowledge Base) is not required; it provides retrieval-augmented generation over data sources for answering questions, not for calling external services.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Action group with API schema
Why this is correct
An action group with an API schema defines the operations the agent may invoke and maps them to external endpoints, satisfying the requirement to call services such as flight search and hotel booking. Amazon Bedrock Agents uses the OpenAPI schema to determine parameters and orchestrate each API call during task execution.
- ✓
AWS Lambda function
Why this is correct
AWS Lambda functions serve as action groups in Amazon Bedrock Agents, executing the business logic that calls external APIs for flight searches and hotel bookings. The agent invokes Lambda with parsed parameters from the user's request, satisfying the requirement to call external services. Lambda returns results the agent uses to formulate its response.
- ✗
Amazon DynamoDB table
Why it's wrong here
DynamoDB stores data but cannot be invoked as an action; Bedrock Agents call external services through action groups backed by Lambda functions. DynamoDB is tempting because agents may persist session state, and would be right for storing booking records, but it provides no callable service interface.
- ✗
Amazon SageMaker endpoint
Why it's wrong here
A SageMaker endpoint hosts a separately trained model; Bedrock Agents invoke external services through action groups backed by Lambda functions, not SageMaker. SageMaker is tempting because it also serves models, and would be correct for custom inference, but it provides no action-group integration for the agent.
- ✗
Bedrock Knowledge Base
Why it's wrong here
A Bedrock Knowledge Base provides a repository of static documents for retrieval-augmented generation (RAG), not the ability to execute live API calls to external services. It is tempting because it can store travel policy documents, which an agent might query for answers, but it lacks the action groups or Lambda functions required to invoke external flight or hotel booking systems. It would be correct only if the agent needed to answer policy questions from a fixed corpus, not to perform transactional operations.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AIF-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AIF-C01 exam.