What is the default subnet mask for a standard Class A IP address under classic classful routing rules? MCQ with Answer and Explanation

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What is the default subnet mask for a standard Class A IP address under classic classful routing rules?

A. 255.255.0.0

B. 255.255.255.255

C. 255.255.255.0

D. 255.0.0.0

Answer: Option D

Solution (By JKSSB Mock Tests)

Class A networks allocate the first octet to the network identity, mapping to a default subnet mask of 255.0.0.0 (or /8).

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Question #1

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What does an IPv4 address configuration use to determine the broadcast address for a specific subnet?

A. The MAC registration lookup

B. The external DNS resolution system

C. The network mask and host bit combinations

D. The loopback hardware interface

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Correct Answer: Option C

Explanation:
Setting all host bits of an IP network block to binary 1 yields the specific broadcast address used to send data to all devices on that subnet.

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Question #2

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What is the role of a DNS resolver?

A. To query DNS servers for domain name resolution

B. To forward packets

C. To assign IP addresses

D. To filter traffic

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Correct Answer: Option A

Explanation:
A DNS resolver is a client that initiates queries to DNS servers to translate domain names.

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Question #3

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What does the term broadcast domain mean?

A. A set of devices that share the same IP network

B. A set of devices that can collide

C. A set of devices that can receive broadcast frames

D. A set of devices connected to a hub

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Correct Answer: Option C

Explanation:
A broadcast domain is a logical division where a broadcast frame sent by one device can reach all other devices.

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