What does a web browser perform when executing a 'DNS Lookup' operation? MCQ with Answer and Explanation

What does a web browser perform when executing a 'DNS Lookup' operation?
A. It downloads heavy multimedia files to local cache blocks.
B. It queries DNS servers to resolve a domain name string into its underlying IP address.
C. It clears out localized hardware registry errors.
D. It establishes a secure tunnel path via proxy configurations.
Answer: Option B
Solution (By JKSSB Mock Tests)
DNS resolution looks up human-readable text domain destinations to find their matching numerical IP addresses so network connections can be established.

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Practice More Internet and Web Technologies Questions

Question #1
Which of the following is a common protocol for streaming media?
A. RTSP
B. RTMP
C. RTP
D. All of the above

Correct Answer: Option D


Explanation:
RTSP, RTP, and RTMP are all protocols used for streaming media, each serving different aspects of real-time data delivery.

This question belongs to: Computer Internet and Web Technologies
Question #2
Which of the following parameters uniquely distinguishes a 'Deep Web' page from a standard surface web page?
A. It is encrypted using military-grade security.
B. It requires high-speed fiber optic connectivity to load.
C. It is not indexed by conventional search engine crawlers.
D. It can only be accessed using specialized Tor networks.

Correct Answer: Option C


Explanation:
The Deep Web encompasses parts of the internet not indexed by traditional search engines, including password-protected portals and private databases.

This question belongs to: Computer Internet and Web Technologies
Question #3
Which standard port is used by default by the IMAP protocol for secure, encrypted email communication (IMAPS)?
A. 993
B. 995
C. 465
D. 143

Correct Answer: Option A


Explanation:
While port 143 is default for unencrypted IMAP, port 993 is the standard allocated port for secure IMAP (IMAPS) over SSL/TLS.

This question belongs to: Computer Internet and Web Technologies