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. 255.255.0.0

C. 255.255.255.0

D. 255.0.0.0

Answer: Option D

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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Question #1

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Which of the following IPv4 address blocks is strictly reserved by the IETF for private local area networks and is non-routable over the public internet?

A. 12.0.0.0 /8

B. 192.168.0.0 /16

C. 8.8.8.0 /24

D. 224.0.0.0 /4

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Correct Answer: Option B

Explanation:
The 192.168.0.0 to 192.168.255.255 range is a standard private IP address block designated by RFC 1918 for internal LAN use.

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Question #2

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Which network topology is most resistant to cable failure?

A. Ring

B. Bus

C. Mesh

D. Star

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Correct Answer: Option C

Explanation:
Mesh provides multiple redundant paths, so a single cable failure does not disconnect the network.

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Question #3

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What is the range of dynamic ports in TCP/UDP?

A. 0-1023

B. 1024-49151

C. 49152-65535

D. 1-65535

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Correct Answer: Option C

Explanation:
Dynamic or private ports are from 49152 to 65535, used for temporary sessions.

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