100-140 Question 199
Single answerA network administrator notices that a device using IPv6 is not receiving a global unicast address, but instead is assigned a link-local address. The administrator suspects an issue with DHCPv6. What is the primary purpose of DHCPv6 in this scenario?
- A
To assign link-local addresses to devices automatically
- B
To provide devices with global unicast addresses and additional configuration settings
- C
To ensure devices communicate exclusively within the local link
- D
To configure IPv6 routing between different subnets
Show answer and explanation
Correct answer: B
Explanation
DHCPv6 is primarily used to assign global unicast addresses to devices in an IPv6 network and provide additional configuration options such as DNS settings. Link-local addresses, on the other hand, are automatically generated and used for communication within the local link, and they do not require DHCPv6. If a device is only using a link-local address, it indicates that DHCPv6 is not properly assigning a global unicast address to the device.
- A. Incorrect.
Link-local addresses are automatically generated by the device itself and do not require DHCPv6. This is not the purpose of DHCPv6.
- B. Correct.
The primary purpose of DHCPv6 is to assign global unicast addresses and provide additional configuration settings like DNS servers to devices in an IPv6 network.
- C. Incorrect.
While link-local addresses are used for local link communication, DHCPv6 is not responsible for limiting communication to the local link.
- D. Incorrect.
Configuring routing between subnets is handled by routing protocols like OSPFv3 or static routes, not by DHCPv6.