What is the purpose of a subnet mask? MCQ with Answer and Explanation

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What is the purpose of a subnet mask?

A. To resolve domain names

B. To define the network portion and host portion of an IP address

C. To assign MAC addresses

D. To encrypt data

Answer: Option B

Solution (By JKSSB Mock Tests)

A subnet mask separates the IP address into network and host bits.

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Question #1

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Which type of network covers an individual's immediate personal space, typically using Bluetooth to sync a smartwatch and phone within a 10-meter radius?

A. PAN

B. LAN

C. WAN

D. MAN

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Correct Answer: Option A

Explanation:
A Personal Area Network (PAN) connects personal electronic devices immediately surrounding an individual user.

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Question #2

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Which device simply acts as a multiport signal repeater, copying incoming bits blindly out to all other ports without reading any address headings?

A. Router

B. Hub

C. Gateway

D. Switch

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Correct Answer: Option B

Explanation:
A hub lacks processing logic to check frame targets. It serves as a Layer 1 broadcast device, repeating signals out across all connected nodes.

This question belongs to: Computer Computer Networking