What is the primary operational task of a 'Local DNS Cache' operating within an individual computer's operating system environment? MCQ with Answer and Explanation

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What is the primary operational task of a 'Local DNS Cache' operating within an individual computer's operating system environment?

A. To temporarily store recently resolved domain-to-IP address lookups locally, avoiding the need to query external DNS servers for repeat visits

B. To filter email spam items from corporate mail boxes

C. To parse HTML structural page data inside browser applications

D. To track local physical network interface hardware performance logs

Answer: Option A

Solution (By JKExamLibrary)

The local DNS cache retains recent domain resolutions in device memory, reducing latency and network traffic by accelerating address lookups for frequently visited websites.

This question belongs to: Computer Internet and Web Technologies

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Question #1 Report Error

What is the purpose of the 'Expires' header in HTTP?

A. To set the expiration time of a cookie

B. To specify the maximum age of the resource

C. To indicate when the response is no longer valid

D. To control the cache

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Correct Answer: Option C

Explanation:
The Expires header gives the date/time after which the response is considered stale, used for caching control.

This question belongs to: Computer Internet and Web Technologies

Question #2 Report Error

What mechanism does a web server implement to gracefully instruct a browser that an old web resource has changed its location permanently to a new URL address asset?

A. Setting a temporary session tracking cookie inside memory

B. Issuing an HTTP 301 Moved Permanently response code with the new location header

C. Issuing a general 500 Internal Error crash notification alert

D. Altering the local computer DNS router configurations

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Correct Answer: Option B

Explanation:
An HTTP 301 redirect informs browsers and search engines that a page has permanently relocated, prompting them to update their links and pass SEO ranking history to the new URL.

This question belongs to: Computer Internet and Web Technologies

Question #3 Report Error

Which specific browser feature or utility allows web developers to test mobile responsive web configurations by mimicking different smartphone screen aspect ratios natively within the desktop display window?

A. Standard bookmark navigation manager

B. Local server cache monitoring index

C. Device Mode / Responsive Design View

D. Incognito browser window frame

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Correct Answer: Option C

Explanation:
Responsive Design View inside browser DevTools lets developers simulate various device viewports, touch interactions, and network throttling states directly on their desktop monitors.

This question belongs to: Computer Internet and Web Technologies

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