Question

Which of the following IP address can be used as a loop-back address?

• A. 255.255.255.255
• B. 127.0.0.1
• C. 0.0.0.0
• D. 255.255.255.0

Hint:

Always remember that **127.0.0.1** is the reserved loopback address in IPv4, commonly used to test network connectivity locally.

Answer 1

The Correct Option is B

The **loopback address** is used by a computer to send network traffic to itself. The IP address **127.0.0.1** is the standard loopback address in IPv4. - **127.0.0.1** is the most commonly used loopback address and refers to the local machine. - **255.255.255.255** is the **broadcast address**, used to send a message to all devices on a network. - **0.0.0.0** is the **default route** address. - **255.255.255.0** is a subnet mask, not a loopback address. Step 2: Conclusion.
The correct loopback address is **127.0.0.1**, which is used for testing network applications within the same machine. Thus, the correct answer is **(2) 127.0.0.1**.