Which IP address class has the first octet range of 1 to 126? MCQ with Answer and Explanation

Question
Which IP address class has the first octet range of 1 to 126?
A. Class B
B. Class C
C. Class D
D. Class A
Answer: Option D
Solution (By JKSSB Mock Tests)
Class A addresses range from 1.0.0.0 to 126.255.255.255, with first bit 0.
This question belongs to: Computer Computer Networking
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Practice More Computer Networking Questions

Question #1
What is the primary function of a Router in a computer network ecosystem?
A. To convert analog signals directly into serial bitstreams.
B. To regenerate weak signals across long cable lengths.
C. To act as a physical patch panel for structural wiring.
D. To connect distinct networks and route data packets based on logical IP addresses.
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Correct Answer: Option D

Explanation:
Routers operate at the Network Layer (Layer 3) and use IP addresses to determine the optimal path for forwarding data packets across different networks.
This question belongs to: Computer Computer Networking
Question #2
What is the default subnet mask for a standard Class A IP address under classic classful routing rules?
A. 255.255.0.0
B. 255.255.255.0
C. 255.0.0.0
D. 255.255.255.255
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Correct Answer: Option C

Explanation:
Class A networks allocate the first octet to the network identity, mapping to a default subnet mask of 255.0.0.0 (or /8).
This question belongs to: Computer Computer Networking
Question #3
Which address is used by an operating system to send a packet to all host devices residing on the local subnet simultaneously?
A. Gateway Address
B. Broadcast Address
C. Loopback Address
D. MAC Identifier
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Correct Answer: Option B

Explanation:
The broadcast address (such as 255.255.255.255 publicly or the last address of a subnet) allows data to target all nodes on that network block.
This question belongs to: Computer Computer Networking
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