Which three message types are used for prefix delegation in DHCPv6? (Choose three.)
Correct Answer: B,C,E
Explanation/Reference:
Explanation:
DHCPv6 Message Types
For a client to get an IPv6 address successfully from a DHCPv6 server, the Client-Server Conversation happens using the following messages.
Client--->Server Messages
Server--->Client Messages
Solicit, Request, Confirm, Renew, Rebind, Release, Decline, Information-Request Advertise, Reply, Reconfigure Lets look at each message types in detail:
SOLICIT
This is the first step in DHCPv6, where a DHCPv6 client sends a Solicit message to locate DHCPv6 servers.
ADVERTISE
Upon receiving a Solicit Message from the client, the DHCPv6 server sends an Advertise message to indicate that it is available for DHCP service, in response to a Solicit message received from a client.
REQUEST
This message is sent by the DHCPv6 client.Client sends a Request message to request configuration parameters which includes IP addresses or delegated prefixes, from a specific server.
CONFIRM
Confirm message is sent by the client to any available server in the network to confirm that the client is still on the same link or it has to be removed. This message also confirms the IPv6 addresses that are assigned to the link are still valid. This could happen in case when a client detects a change in link-layer connectivity or if the device is powered on and it is found that one or more leases are still valid. Note that only the prefix portion of the addresses are validated and not the actual leases.
RENEW
A client sends a Renew message to the server when it wants to extend the lifetimes on the addresses and other configuration parameters assigned to the client and also to update other configuration parameters.
REBIND
In case of No response from the DHCPv6 Server for the Renew message, the client sends a Rebind message to any available server to extend the lifetimes on the address and to update other configuration parameters.
REPLY
A Reply message is sent by the DHCPv6 Server in response to a Solicit, Request, Renew, Rebind message received from a client. The reply message is sent by the server in response to a confirm message (either confirming or denying) that the addresses assigned to the client are appropriate.In short the server acknowledge receipt of a Release or Decline message by sending a REPLY message.
RELEASE
Release message as the name implies, is sent by the client to the server that has assigned the addresses, to indicate that the client will no longer use the assigned addresses (one or more).
DECLINE
Client sends a Decline message to the DHCPv6 server to tell that the one or more addresses assigned by the server is already in use RECONFIGURE The Reconfigure Message is sent by the DHCPv6 server to the client when the server has new or updated information of configuration parameters. It tells the client to initiate a information- request/reply message to the server so as to receive the updated information.
INFORMATION-REQUEST
Information-Request message is sent by the client to the server to update the configuration parameters Reference: https://supportforums.cisco.com/blog/153426/implementing-dhcpv6-introduction