50 MuleSoft Integration Foundations Practice Questions: Question Bank 2025

An integration team is explaining REST to business stakeholders. Which statement best describes a RESTful API?

A customer system occasionally responds slowly, causing timeouts in a Mule integration. Which approach best improves resilience without changing the customer system?

A developer wants to discover and reuse an existing Customer API specification and documentation published by another team. Where should they look in the MuleSoft platform?

An organization is adopting API-led connectivity. Which API layer is primarily responsible for orchestrating calls to multiple systems and applying business logic for a specific process (for example, "Order Fulfillment")?

A team wants a consistent contract-first approach so consumers can understand the API before it is implemented. Which artifact best supports this in MuleSoft?

A Mule application is deployed to CloudHub and is running, but consumers cannot reach it using the expected public URL. Which is the most likely cause?

An API consumer reports receiving HTTP 401 responses from an API deployed on the MuleSoft platform. Which explanation is most accurate?

A company needs to integrate an on-premises database with CloudHub applications without opening inbound firewall ports to the data center. Which MuleSoft component best supports this requirement?

A Mule flow calls a back-end system that enforces strict rate limits. The team wants to prevent spikes from overwhelming the back end while still accepting requests from clients. Which pattern best fits this need?

A deployment pipeline uses environment-specific values (for example, endpoint URLs and credentials) that should not be hard-coded in the Mule application. What is the recommended approach?

A team is building a new integration and wants consumers to understand how to use the API without direct support. Which MuleSoft asset best provides a standardized, self-describing API contract?

A company needs to ensure that only approved applications can call an internal API and that calls are rate limited. Which platform capability is primarily used to enforce these controls?

A retailer wants to integrate a new mobile app with several backend systems. They plan to create reusable APIs for key capabilities such as Customer, Orders, and Inventory. Which approach best aligns with API-led connectivity?

A company has an order-processing flow that must call an external payment provider. The payment provider can occasionally take several seconds to respond and sometimes times out. What is a recommended design approach to improve resiliency without blocking the main processing thread for long periods?

A team needs to reuse a common transformation and error-handling approach across multiple Mule applications. Which Anypoint Exchange asset type is most appropriate for sharing this reusable implementation logic?

A developer deploys an application to CloudHub and it fails to start. They need to quickly find the root cause. Where should they look first for startup errors and stack traces?

An integration exposes an HTTP endpoint that internal systems call. The callers sometimes send duplicate requests due to network retries. The business requires that processing occur only once per unique order ID. Which pattern best addresses this requirement?

An organization wants to manage multiple environments (Dev, Test, Prod) with different endpoint URLs and credentials without changing the application code each time. Which practice best supports this requirement?

A team applies an OAuth 2.0 policy in API Manager to an API, but client applications still access the API without providing an access token. What is the most likely reason?

A Mule application integrates with an external SaaS that enforces strict API limits. The integration must smooth traffic spikes and ensure requests are eventually processed, even if the SaaS is temporarily unavailable. Which design is most appropriate?

A team is building a new API and wants client applications to discover how to call it, understand request/response schemas, and test endpoints without reading custom documentation. Which approach best supports this goal on the MuleSoft platform?

A Mule application calls a third-party system that enforces a strict limit of 100 requests per minute per client. The integration must prevent exceeding this limit while still allowing internal clients to make requests. Which policy/approach is most appropriate?

In API-led connectivity, which API type is primarily responsible for implementing business logic by orchestrating one or more System APIs into a reusable capability?

A company wants API consumers to request access and obtain credentials in a controlled way, while allowing the API team to approve and manage who can call the API. Which MuleSoft capability best supports this?

A retailer needs to integrate order data from an internal system to a partner system. The partner is frequently unavailable, but orders must not be lost and should be delivered when the partner returns. Which integration pattern best fits?

A Mule flow is supposed to call an HTTP service at a URL stored in a property named "service.host". At runtime, the app fails with an error indicating the property cannot be resolved. Which is the most likely cause?

An API is being designed for multiple consumers, and the backend data model changes frequently. The team wants to minimize breaking changes for consumers and evolve the implementation independently. Which approach best supports this?

A financial services organization must ensure sensitive fields (for example, SSNs) are not visible in logs while still enabling troubleshooting. Which practice best addresses this requirement in Mule applications?

A company is building API-led connectivity for customer data. Multiple downstream systems will be used (CRM, billing, and support). The organization wants to avoid duplicating connectivity logic and credentials handling across projects. Which design choice best aligns with API-led best practices?

An API is deployed behind an API gateway. Clients intermittently receive 401 Unauthorized responses even though they provide a client ID and client secret. Which is the most likely explanation?

An organization wants to expose data to external partners but must prevent those partners from learning the underlying backend system details. Which API-led layer is best suited for this purpose?

A developer is asked to publish an API so other teams can discover it, review its documentation, and request access in a self-service way. Which MuleSoft capability supports this goal?

A team is designing an integration that calls a system which can take several seconds to respond. They want to avoid having the client wait synchronously for the full processing. Which integration style best fits this requirement?

An API returns HTTP status code 404 to a client. What does this indicate?

A team wants to apply consistent client authentication, rate limiting, and IP allowlisting policies across multiple APIs without changing each API implementation. Where should these policies be applied?

A retailer needs to integrate Salesforce, an on-premises ERP, and a shipping provider. They want to reuse the same ERP connectivity across multiple business processes (order, returns, inventory). Which API-led approach best supports this reuse?

An integration receives thousands of messages per minute. The backend can only handle a limited number of concurrent updates. Which approach best helps protect the backend while still accepting incoming requests?

A Mule application deployed to CloudHub is not processing messages, and logs show repeated connection failures to an on-premises database. The database is reachable only from the corporate network. What is the most likely missing component?

A company needs to ensure that a client can safely retry a request without creating duplicate orders in the backend. Which design principle best addresses this?

A team wants to deploy the same Mule application to dev, test, and prod with different endpoint URLs and credentials, while keeping the artifact identical across environments. Which approach is most appropriate?

An API consumer reports they cannot tell whether a request failed due to invalid input or a server error. Which API design practice most directly addresses this?

A team wants to standardize access to system APIs and apply policies (such as client ID enforcement) consistently for all environments. Which MuleSoft component is primarily used to manage and apply these API policies at runtime?

A flow calls an external REST service. The service responds with HTTP 401 Unauthorized. What is the most likely root cause?

A retail company needs near real-time integration between an eCommerce platform and an ERP system. The ERP supports asynchronous messaging and the company wants to avoid tight coupling and handle intermittent downtime. Which integration approach best fits?

A company uses an Experience API consumed by multiple mobile apps. They plan to introduce a breaking change to a response field name. What is the recommended approach to minimize impact on existing consumers?

An organization wants to ensure developers can discover reusable APIs, connectors, and templates across teams, and also publish internal assets for reuse. Which Anypoint Platform capability best supports this?

A Mule application processes customer updates. Occasionally the downstream CRM is slow, causing requests to pile up. The team wants to protect the CRM and fail fast when it is unhealthy, while automatically recovering when it improves. Which resiliency pattern best fits?

A team notices that a Mule app deployed to a shared CloudHub environment sometimes fails under load. They suspect insufficient compute resources for the worker. Which CloudHub concept most directly relates to sizing the runtime resources for an application?

A Mule app publishes messages to a queue and a separate flow consumes and processes them. The business requires that each message be processed exactly once. Which statement is most accurate regarding this requirement in distributed integrations?

A team wants to create a CI/CD pipeline that promotes the same Mule application artifact through dev, test, and prod with environment-specific settings (for example, endpoints and credentials) without modifying code between environments. Which approach best supports this?