What is the default subnet mask for a Class C IP address? MCQ with Answer and Explanation

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What is the default subnet mask for a Class C IP address?

A. 255.255.255.0

B. 255.255.255.255

C. 255.255.0.0

D. 255.0.0.0

Answer: Option A

Solution (By JKSSB Mock Tests)

Class C has a default subnet mask of 255.255.255.0, providing up to 254 hosts.

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What is the purpose of the TTL (Time-to-Live) field in an IP packet?

A. To encrypt the packet

B. To indicate packet length

C. To prioritize packets

D. To prevent packets from looping indefinitely

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Correct Answer: Option D

Explanation:
TTL limits the lifespan of a packet; each hop decrements it, and when it reaches 0, the packet is discarded.

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Question #2

Which device is used to connect a computer to a digital subscriber line (DSL) service?

A. Cable modem

B. Switch

C. DSL modem

D. Router

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Correct Answer: Option C

Explanation:
A DSL modem connects a computer or router to the telephone line for DSL internet.

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Question #3

Which of the following is a dynamic routing protocol?

A. Static routing

B. Default routing

C. Routing table

D. OSPF

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Correct Answer: Option D

Explanation:
OSPF (Open Shortest Path First) is a dynamic routing protocol that automatically adapts to network changes.

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