🔌 Using APIs - DEVCOR Practice Questions

Master REST, SOAP, GraphQL APIs, webhooks, pagination, rate limiting, and how to consume and build APIs for network and infrastructure automation.

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DEVCOR APIs Question Bank (21 Questions)

Browse all 21 practice questions covering Using APIs for the DEVCOR certification exam. Answers are intentionally hidden on this page so you can self-test first before checking results in quiz mode.

  1. Question 1Using APIs

    Which API pagination approach uses a cursor/token to fetch the next page of results?

    AOffset-based pagination
    BCursor-based pagination
    CPage number pagination
    DRandom pagination

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  2. Question 2Using APIs

    What advantage does GraphQL provide over traditional REST APIs?

    AGraphQL uses XML instead of JSON
    BClients specify exactly which fields they need, preventing over-fetching and under-fetching of data
    CGraphQL eliminates the need for authentication
    DGraphQL only supports GET requests

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  3. Question 3Using APIs

    What is API rate limiting and how should clients handle HTTP 429 responses?

    ARate limiting blocks all API access permanently
    BIt restricts the number of requests per time period; clients should implement exponential backoff and retry
    CRate limiting only applies to GET requests
    DClients should switch to a different API

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  4. Question 4Using APIs

    Which HTTP method is idempotent and used to update an entire resource?

    APOST
    BPUT
    CPATCH
    DDELETE

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  5. Question 5Using APIs

    What is pagination in REST APIs?

    APage layout
    BBreaking large result sets into smaller pages with metadata (total count, next/prev links) to improve performance and usability
    CPrinting pages
    DDocument formatting

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  6. Question 6Using APIs

    How do webhooks differ from polling for receiving event notifications from an API?

    AWebhooks require the client to repeatedly check for updates
    BWebhooks push notifications to a client's URL when events occur, eliminating the need for repeated polling
    CWebhooks are slower than polling
    DWebhooks only work with SOAP APIs

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  7. Question 7Using APIs

    What does HATEOAS (Hypermedia as the Engine of Application State) add to a REST API?

    AAuthentication mechanisms
    BLinks in API responses that guide clients to available next actions and related resources
    CDatabase connection pooling
    DAutomatic caching

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  8. Question 8Using APIs

    Which HTTP status code range indicates client-side errors in a REST API?

    A1xx
    B4xx
    C2xx
    D3xx

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  9. Question 9Cisco Platforms

    Which Cisco security platform provides REST APIs for managing firewall rules, access policies, and intrusion detection?

    ACisco Meraki
    BCisco Firepower Management Center (FMC)
    CCisco Webex
    DCisco UCS

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  10. Question 10Using APIs

    What are key differences between REST and SOAP APIs?

    AREST uses XML exclusively; SOAP uses JSON
    BREST is lightweight using HTTP methods/JSON; SOAP is protocol-heavy using XML envelopes with strict typing
    CREST requires WSDL; SOAP does not
    DSOAP is stateless; REST is stateful

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  11. Question 11Using APIs

    What is the relationship between YANG models and RESTCONF/NETCONF APIs on network devices?

    AThey are unrelated technologies
    BYANG defines the data structure; RESTCONF and NETCONF provide the transport protocols to interact with YANG-modeled data
    CRESTCONF replaces YANG
    DYANG is only for monitoring, not configuration

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  12. Question 12Using APIs

    What is the purpose of API rate limiting?

    AImprove API response quality
    BPrevent abuse and ensure fair usage by limiting the number of requests per time period
    CEncrypt API data
    DManage API versions

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  13. Question 13Using APIs

    What is pagination in API responses used for?

    ASorting results
    BBreaking large result sets into manageable pages to reduce response size and improve performance
    CFiltering duplicates
    DEncrypting responses

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  14. Question 14Using APIs

    What is the purpose of API pagination?

    ASpeed up APIs
    BReturn large result sets in smaller chunks (pages) to reduce response size, memory usage, and improve performance
    CEncrypt API data
    DVersion APIs

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  15. Question 15Using APIs

    What is GraphQL and how does it differ from REST?

    AA database query language
    BA query language for APIs where clients specify exactly what data they need in a single request, reducing over/under-fetching vs REST
    CA graph database
    DA monitoring tool

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  16. Question 16Using APIs

    What is API rate limiting and why is it important?

    ALimiting API features
    BControlling the number of API requests per time period to prevent abuse, ensure fair usage, and protect backend resources
    CLimiting API versions
    DLimiting response size

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  17. Question 17Using APIs

    What is rate limiting in APIs?

    ASpeed up API calls
    BControlling the number of requests a client can make within a time window to prevent abuse and ensure fair usage
    CLimit data returned
    DLimit API features

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  18. Question 18Application Deployment and Security

    How does a JSON Web Token (JWT) work for API authentication?

    AThe server stores session data for each JWT
    BA self-contained, digitally signed token carries claims (user info, permissions) that the server can verify without storing session state
    CJWT tokens never expire
    DJWT uses symmetric encryption only

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  19. Question 19Software Development and Design

    What is the purpose of a REST API's idempotent methods?

    ASpeed up API responses
    BEnsure that making the same request multiple times produces the same result
    CEncrypt API traffic
    DAuthenticate users

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  20. Question 20Using APIs

    Which authentication mechanism uses tokens obtained after initial authentication to authorize subsequent API requests?

    ABasic Authentication
    BOAuth 2.0 Bearer Token
    CAPI Key in URL
    DClient Certificate

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  21. Question 21Using APIs

    Which data format is MOST commonly used for REST API request and response bodies?

    AXML
    BJSON
    CYAML
    DCSV

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Key APIs Concepts for DEVCOR

restapigraphqlwebhookpaginationrate limitoauthtoken

DEVCOR APIs Exam Tips

Using APIs questions in DEVCOR are typically scenario-based. Focus on service-level decision making aligned to official exam objectives. Priority concepts: rest, api, graphql, webhook, pagination, rate limit.

What DEVCOR Expects

  • Anchor your answer in select the most practical, secure, and scalable answer for the stated scenario.
  • APIs scenarios for DEVCOR are frequently mapped to Domain 2 (20%), so read the objective carefully before picking controls or architecture.
  • Expect multi-topic scenarios where APIs interacts with routing, switching, security, or automation patterns rather than appearing as an isolated question.
  • When two options are both technically valid, prefer the choice that best aligns with the exam's operational scope (Professional) and vendor best practices.

High-Value APIs Concepts

  • Know the core APIs building blocks cold: rest, api, graphql, webhook.
  • Review the edge-case features and limits for pagination, rate limit; these details are commonly used to differentiate answer choices.
  • Practice service-integration reasoning: how APIs pairs with Software Design, Cisco Platforms in real deployment patterns.
  • For DEVCOR, explain why the chosen APIs design meets reliability, security, and cost expectations better than the alternatives.

Common DEVCOR Traps

  • Watch for answers that partially solve the requirement but miss operational constraints.
  • Questions in Using APIs often include distractors that look correct for APIs but violate security policy, convergence, or redundancy requirements.
  • Avoid picking options purely by feature name; validate data path, failure handling, and governance impact before answering.
  • If the prompt hints at automation or repeatability, eliminate manual-only operational answers first.

Fast Review Checklist

  • Can you compare at least two APIs implementation paths and justify which one best fits the scenario?
  • Can you map the chosen answer back to Using APIs (20%) outcomes for DEVCOR?
  • Can you explain security and access boundaries for APIs without relying on default-open assumptions?
  • Can you describe how APIs integrates with Software Design and Cisco Platforms during failure, scaling, and monitoring events?

Exam Domains Covering APIs

Domain 2Using APIs20%

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