What is a best practice when building System APIs?

• A.Document the API using an easily consumable asset like a RAML definition
• B.Model all API resources and methods to closely mimic the operations of the backend system
• C.Build an Enterprise Data Model (Canonical Data Model) for each backend system and apply it to System APIs
• D.Expose to API clients all technical details of the API implementation's interaction with the backend system

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An API experiences a high rate of client requests (TPS) vwth small message paytoads. How can usage limits be imposed on the API based on the type of client application?

• A.Use an SLA-based rate limiting policy and assign a client application to a matching SLA tier based on its type
• B.Use a spike control policy that limits the number of requests for each client application type
• C.Use a cross-origin resource sharing (CORS) policy to limit resource sharing between client applications, configured by the client application type
• D.Use a rate limiting policy and a client ID enforcement policy, each configured by the client application type

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What is typically NOT a function of the APIs created within the framework called API-led connectivity?

• A.They provide an additional layer of resilience on top of the underlying backend system, thereby insulating clients from extended failure of these systems.
• B.They allow for innovation at the user Interface level by consuming the underlying assets without being aware of how data Is being extracted from backend systems.
• C.They reduce the dependency on the underlying backend systems by helping unlock data from backend systems In a reusable and consumable way.
• D.They can compose data from various sources and combine them with orchestration logic to create higher level value.

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How can the application of a rate limiting API policy be accurately reflected in the RAML definition of an API?

• A.By refining the response definitions by adding the x-ratelimit-* response headers with description, type, and example
• B.By refining the response definitions by adding the out-of-the-box Anypoint Platform rate-limit-enforcement securityScheme with description, type, and example
• C.By refining the resource definitions by adding a description of the rate limiting policy behavior
• D.By refining the request definitions by adding a remaining Requests query parameter with description, type, and example

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The responses to some HTTP requests can be cached depending on the HTTP verb used in the request. According to the HTTP specification, for what HTTP verbs is this safe to do?

• A.PUT, POST, DELETE
• B.GET, HEAD, POST
• C.GET, PUT, OPTIONS
• D.GET, OPTIONS, HEAD

Correct Answer: D

Correct answer: GET, OPTIONS, HEAD

http://restcookbook.com/HTTP%20Methods/idempotency/

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