CompTIA Network+ Practice Test

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What is the role of Duplicate Address Detection (DAD) in IPv6?

Assigns unique addresses to each device
Verifies that no other device is using the same address
Configures the router settings
Simplifies address allocation

The correct answer is: Verifies that no other device is using the same address

Duplicate Address Detection (DAD) is an essential process in the IPv6 protocol that ensures the uniqueness of IP addresses assigned to devices on a network. Its primary role is to verify that no other device on the same local network is using the same address before a device configures itself with that address. When a device attempts to use an IPv6 address, it sends a Neighbor Solicitation message to check for any other device utilizing that address. If no response is received, the address is deemed unique, and the device can proceed to configure itself with that address. This process helps prevent address conflicts that can lead to communication failures, as two devices with the same IP address would cause network ambiguity. DAD is a critical mechanism in IPv6's Address Auto-configuration process, ensuring that each device can confidently claim its address without the risk of duplication within the local network.