What is the loopback IP address in IPv4? MCQ with Answer and Explanation

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What is the loopback IP address in IPv4?

A. 0.0.0.0

B. 192.168.1.1

C. 255.255.255.255

D. 127.0.0.1

Answer: Option D

Solution (By JKSSB Mock Tests)

127.0.0.1 is the loopback address used for testing network software on the local machine.

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Practice More Computer Networking Questions

Question #1

What is a default gateway in a network?

A. The network switch

B. The primary DNS server

C. The DHCP server

D. The device that routes traffic to other networks

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Correct Answer: Option D

Explanation:
The default gateway is a router that connects the local network to external networks.

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Question #2

Which type of network spans across multiple office locations in different cities or states, typically requiring leased telecommunication lines?

A. MAN

B. WAN

C. LAN

D. PAN

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Correct Answer: Option B

Explanation:
A Wide Area Network (WAN) connects separate business branches across regional, national, or global boundaries.

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Question #3

What structural advantage does a full Mesh Topology layout offer compared to alternative network configurations?

A. It minimizes physical cabling costs.

B. It provides maximum fault tolerance and reliability by establishing direct redundant connections between all nodes.

C. It removes the requirement for hardware MAC profiles.

D. It can operate without network interface cards.

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Correct Answer: Option B

Explanation:
Because a full mesh topology links every device directly to every other device, a failed line can be easily bypassed using alternative redundant paths.

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