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  • Placement 360 CourseExplore

    • Address Resolution in DNS (Domain Name Server)

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    Question 1

    What is the primary function of DNS address resolution?

    • A

      Encrypting domain names for secure browsing

    • B

      Converting human-readable domain names to IP addresses like a digital phonebook

    • C

      Assigning static IP addresses to devices

    • D

      Monitoring network traffic for threats

    Question 2

    In DNS resolution, what does the resolver do if the local server lacks the mapping?

    • A

      Returns an error immediately

    • B

      Queries higher-level servers like root or TLD until resolved

    • C

      Ignores the request

    • D

      Broadcasts to all devices

    Question 3

    What key difference defines recursive resolution versus iterative?

    • A

      Recursive returns referrals; iterative gives final answers

    • B

      Recursive has the server fully resolve; iterative makes client query each server

    • C

      Iterative uses only root servers; recursive skips TLD

    • D

      Recursive disables caching; iterative requires it

    Question 4

    How does DNS caching improve performance during resolution?

    • A

      Increases query time by contacting root servers always

    • B

      Stores resolved mappings with TTL to answer future queries quickly from cache

    • C

      Deletes all records immediately after use

    • D

      Only caches IP-to-domain mappings

    Question 5

    What security risk in DNS caching redirects users to malicious sites?

    • A

      TTL expiration

    • B

      Recursive referral overload

    • C

      Inverse domain queries

    • D

      Cache poisoning by injecting false mappings

    There are 5 questions to complete.

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