The IBM C1000-138 exam validates your ability to implement and manage API solutions using IBM API Connect v10.0.3. This certification, part of the IBM Certified Solution Implementer, API Connect v10.0.3 credential, is designed for architects, developers, and operations professionals who design and deploy API ecosystems. This page maps the exam syllabus, explains question formats, and guides your preparation strategy so you can approach the test with confidence.
Use this topic map to guide your study for IBM C1000-138 (IBM API Connect v10.0.3 Solution Implementation) within the IBM Certified Solution Implementer, API Connect v10.0.3 path.
The C1000-138 exam uses a mix of question types to assess both foundational knowledge and practical decision-making in real-world API implementation scenarios.
Questions progress in difficulty and reward candidates who understand not just "what" to do, but "why" certain decisions matter in production environments.
A structured study plan aligned to the five core topics ensures you cover all exam domains without gaps. Dedicate time each week to one or two topics, hands-on practice, and progressive review of weaker areas.
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API Developer Role and API Product Manager Role typically account for the largest portion of the exam because they directly impact how APIs are built, packaged, and delivered to consumers. However, all five domains are tested, so a balanced study approach is essential. Strong coverage of policy application, versioning, and product lifecycle management will strengthen your overall score.
In practice, the Provider Organization Owner establishes governance and roles, the API Developer builds the API and applies policies, the API Product Manager packages it for consumption, and the Developer Portal (managed by administrators) exposes it to consumers. Understanding these interdependencies helps you see how decisions in one role affect downstream operations and consumer experience. For example, a developer's choice of authentication policy must align with the organization's security standards and the portal's credential management capabilities.
Hands-on experience with IBM API Connect significantly improves retention and confidence. Prioritize labs that cover API creation, policy application, product publishing, and portal configuration. If you have limited lab access, focus on simulating real scenarios: create a simple API, apply rate-limiting and security policies, package it as a product, and test consumer onboarding in the portal. Even 10-15 hours of guided practice can reinforce exam concepts.
Many candidates confuse role-based permissions and attempt to perform tasks outside their assigned scope. Others misunderstand how policies stack and interact, leading to incorrect answers about security or performance outcomes. A third common error is overlooking portal configuration details, such as how consumer credentials are generated or how usage analytics are tracked. Review the role definitions and policy interaction patterns carefully during your final week of study.
In your final week, dedicate three days to reviewing high-value topics (policies, organization roles, and product lifecycle), two days to a full-length timed practice test and detailed review, and two days to targeted review of any remaining weak areas. Avoid cramming new topics; instead, focus on reinforcing concepts you have already studied and building speed and accuracy. Get adequate sleep the night before the exam to ensure mental clarity.
The GraphQL developer incorporated a field that should not be available for introspection or validation by the client.
How would the API developer obfuscate the field so clients will not view them?
To obfuscate a field in a GraphQL schema so that it is not available for introspection or validation by the client, the API developer can apply the @hide directive to the field. This directive tells the GraphQL engine to exclude the field from the schema introspection and validation process, making it invisible to clients.
IBM API Connect: GraphQL API Development
IBM API Connect: GraphQL Schema Directives
Which set of APIs should be used to register users in the Developer Portal, create applications, and subscribe to APIs?
The Consumer APIs should be used to register users in the Developer Portal, create applications, and subscribe to APIs. These APIs provide the necessary endpoints and functionality for Consumers to interact with the Developer Portal and manage their API usage.
IBM API Connect: Consumer APIs
IBM API Connect: Using the Consumer APIs
What is a key requirement when creating an OpenAPI 3.0 API secured by basic authentication, API Key, or OAuth?
When creating an OpenAPI 3.0 API in IBM API Connect v10.0.3 that is secured by basic authentication, API Key, or OAuth, it is essential that the security-schema-name follows a specific pattern. This pattern is required to ensure proper validation and application of the security definitions according to the OpenAPI 3.0 specification. The security definitions help define the methods of authentication that are enforced for accessing the API endpoints, which is crucial for maintaining the API's integrity and security.
Which two image formats are supported for use in the developer portal?
The Developer Portal in API Connect supports the following image formats:
JPEG (.jpg): This is a widely used image format that is commonly used for photos and other images.
GIF (.gif): This format is often used for animated images and simple graphics.
While other formats may be technically possible to use in the Developer Portal, these two are the most widely supported and recommended formats.
IBM API Connect: Developer Portal User Guide
IBM API Connect: Creating and Managing Products
Given the API Endpoint, "https://cor.client.rtc/savings/annual/", which statement is correct with default Catalog settings?
API Endpoint Structure: In IBM API Connect, the structure of an API endpoint URL typically includes the base URL, followed by the catalog name, and then the API name.
Catalog Name: The segment of the URL immediately following the base URL (in this case, ''savings'') is generally the name of the catalog to which the API is deployed. This is a default setting in IBM API Connect.
API Name: The last segment of the URL (in this case, ''annual'') is usually the name of the API being called.
Default Catalog Settings: With default catalog settings, the catalog name is included in the URL to distinguish between different catalogs. This helps in organizing and managing APIs across different environments or stages (e.g., development, testing, production).
IBM API Connect documentation on API endpoint structure and catalog settings.
General principles of API management and deployment in IBM API Connect.