Which packets are used by the DHCPv6 client and the DHCPv6 server to determine whether the client uses DHCPv6 stateful autoconfiguration or DHCPv6 stateless autoconfiguration? (Muitiple choice)

• A.RS
• B.NS
• C.NA
• D.DA

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Refer to the graphic.

In order to improve security, the two hosts use IPsec VPN to transmit data.
Which IPsec mode and protocol can be used to hide the host's IP address? (Multiple Choice)

• A.ESP.
• B.AH.
• C.Tunnel mode.
• D.Transport mode.

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