Which class of IP address has the first octet ranging from 128 to 191? MCQ with Answer and Explanation

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Which class of IP address has the first octet ranging from 128 to 191?

A. Class B

B. Class C

C. Class D

D. Class A

Answer: Option A

Solution (By JKSSB Mock Tests)

Class B addresses have first octet between 128 and 191.

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Question #1

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What is the primary operational objective of the Dynamic Host Configuration Protocol (DHCP) framework?

A. To encrypt frame headers across a network interface.

B. To manage physical hardware MAC sorting rules.

C. To map alphanumeric domain paths to server IP records.

D. To automatically assign temporary logical IP address configurations and subnets to connecting network client devices.

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Correct Answer: Option D

Explanation:
DHCP automatically assigns IP addresses, subnet masks, and default gateways to devices when they connect to a network.

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Question #2

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Which protocol is used for sending email between servers?

A. SMTP

B. HTTP

C. IMAP

D. POP3

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Correct Answer: Option A

Explanation:
SMTP (Simple Mail Transfer Protocol) is used for sending email from client to server and between servers.

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Question #3

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Which device is used to extend a network's physical range by amplifying signals?

A. Repeater

B. Switch

C. Router

D. Gateway

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Correct Answer: Option A

Explanation:
A repeater amplifies and regenerates signals to extend cable length.

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