Which of the following is a protocol used for network time synchronization? MCQ with Answer and Explanation

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Which of the following is a protocol used for network time synchronization?

A. NTP

B. DNS

C. Both

D. SNTP

Answer: Option C

Solution (By JKSSB Mock Tests)

NTP (Network Time Protocol) and its simplified version SNTP are used to synchronize computer clocks over a network.

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

A. To control the cache

B. To set the expiration time of a cookie

C. To indicate when the response is no longer valid

D. To specify the maximum age of the resource

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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.

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Question #2

What is the function of a DNS server?

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B. To encrypt data

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D. To store web pages

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Correct Answer: Option C

Explanation:
DNS (Domain Name System) servers resolve human-readable domain names (e.g., www.example.com) to numerical IP addresses (e.g., 192.0.2.1) required for network routing.

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Which email infrastructure component is responsible for receiving inbound emails from external domains and placing them into the correct individual user's mailbox storage?

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Correct Answer: Option D

Explanation:
The Mail Delivery Agent (MDA) accepts messages handed down from mail transport systems and writes them directly into the recipient's localized mailbox storage.

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