TestOut LabSim A+ Certification Practice Exam

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In a network using the 192.168.1.0 address, what is the loopback address for a computer on that network?

192.168.1.1
192.168.1.55
192.168.1.254
127.0.0.1

The correct answer is: 127.0.0.1

The loopback address is a special IP address used by a device to communicate with itself. It serves as a way for the system to send and receive its messages internally. The standard loopback address defined by the Internet Protocol (IP) is 127.0.0.1, which is commonly referred to as "localhost." Regardless of the network address the device is part of, such as the 192.168.1.0 network in this case, the loopback address remains the same. This means that a computer on the 192.168.1.0 network can always refer to itself using 127.0.0.1 for local communication. The other addresses listed (192.168.1.1, 192.168.1.55, and 192.168.1.254) are not loopback addresses; instead, they are valid addresses within the 192.168.1.0 subnet that could be assigned to devices for communication within that specific network. However, they would not serve the unique purpose of the loopback address, which is dedicated solely for local self-communication.