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A network administrator configures a router to send RA messages with M flag as 0 and O flag as 1. Which statement describes the effect of this configuration when a PC tries to configure its IPv6 address?

  • It should contact a DHCPv6 server for all the information that it needs.
  • It should use the information that is contained in the RA message exclusively.
  • It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information.
  • It should contact a DHCPv6 server for the prefix, the prefix-length information, and an interface ID that is both random and unique.
Answers Explanation & Hints:

ICMPv6 RA messages contain two flags to indicate whether a workstation should use SLAAC, a DHCPv6 server, or a combination to configure its IPv6 address. These two flags are M flag and O flag. When both flags are 0 (by default), a client must only use the information in the RA message. When M flag is 0 and O flag is 1, a client should use the information in the RA message and look for the other configuration parameters (such as DNS server addresses) on DHCPv6 servers.

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