100-140 Question 200
Single answerAn IT technician is troubleshooting an IPv6 network issue where a host is unable to communicate with other devices on the same subnet. Upon inspecting the host's IPv6 address, they notice the device has only a link-local address assigned. How can DHCPv6 help resolve this issue?
- A
DHCPv6 can assign the host a global unicast address, enabling communication beyond the local link.
- B
DHCPv6 replaces the link-local address with a new link-local address that supports global communication.
- C
DHCPv6 allows the host to communicate directly with other devices on the same subnet without needing a global address.
- D
DHCPv6 assigns a unique MAC address to the host to ensure proper IPv6 functionality.
Show answer and explanation
Correct answer: A
Explanation
Link-local addresses in IPv6 are automatically generated and are used for communication within the same link (e.g., devices on the same subnet). However, to communicate beyond the local link, a global unicast address is required. DHCPv6 enables the assignment of such global addresses, resolving the issue in this scenario.
- A. Correct.
Correct. DHCPv6 can assign a global unicast address to the host, enabling communication with devices outside the local link. Link-local addresses are only valid for communication within the same link.
- B. Incorrect.
Incorrect. DHCPv6 does not replace link-local addresses, as they are automatically generated by the system and are mandatory for IPv6 communication. It instead provides global addresses for broader communication.
- C. Incorrect.
Incorrect. While link-local addresses allow communication within the same subnet, DHCPv6 is used to assign additional addresses like global unicast addresses for external communication.
- D. Incorrect.
Incorrect. DHCPv6 does not handle MAC address assignment; it is responsible for assigning IPv6 addresses and other configuration options.