What default subnet mask is mapped to standard Class A IP network address tracks under traditional classful sorting models? MCQ with Answer and Explanation

Question

What default subnet mask is mapped to standard Class A IP network address tracks under traditional classful sorting models?

A. 255.255.255.255

B. 255.0.0.0

C. 255.255.0.0

D. 255.255.255.0

Answer: Option B

Solution (By JKSSB Mock Tests)

Class A networks allocate the first 8 bits (octet) to the network ID, which corresponds to a default subnet mask of 255.0.0.0.

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Which network topology is used in early Ethernet networks with coaxial cable?

A. Ring

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C. Mesh

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Correct Answer: Option B

Explanation:
Early Ethernet used a bus topology with coaxial cable (thicknet/thinnet).

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Question #2

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Which of the following is a private IP address designated for exclusive use within local area networks?

A. 10.0.0.1

B. 168.192.1.1

C. 200.100.50.1

D. 8.8.8.8

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Correct Answer: Option A

Explanation:
The 10.0.0.0 to 10.255.255.255 range is defined by RFC 1918 as a private Class A IP block reserved for internal networks.

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What does a modem do?

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Correct Answer: Option C

Explanation:
A modem (modulator-demodulator) converts digital data from a computer to analog for transmission over telephone lines and vice versa.

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