Cisco 400-051 Exam

You consider using RPL in a new loT environment. Which definition of a DIO is true?

  • A. A DIO is an ICMPv6 RPL control message whose main function is to perform DODAG secure message counters
  • B. A DIO is an ICMPv4 RPL control message whose main function is to perform DODAG discovery, formation, and maintenance
  • C. A DIO is an ICMPv6 RPL control message whose main function is to perform DODAG discovery, formation, and maintenance
  • D. A DIO is an ICMPv4 RPL control message whose main function is to propagate destination information in a RPL network
Answer: Option C.
Explanation: 
RPL messages are carried via ICMPv6 message. The following messages are available: DAG Information Solicitation (DIS) DAG Information Object (DIO) Destination Advertisement Object (DAO) RPL DIO messages are sent for DODAG discovery and maintenance. DIO are multicasted according to trickle timers. DIO messages are used for DODAG discovery and maintenance. Use the dao solicit-interval command to configure the frequency (in minutes) at which the root can solicit destination advertisement messages from the downstream nodes. The mode of operation setting is specified as part of instance ID definition. You can also increment the version number using the version-number version keyword argument pair in the rpl command.

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