IPv6 RS and RA Messages

ABE.

IPv6 Router Solicitation (RS) and Router Advertisement (RA) messages are part of the IPv6 protocol suite and are used to provide communication between routers and hosts. Here are the correct statements that describe the purpose and operation of IPv6 RS and RA messages:

A. Both IPv6 RS and RA packets are ICMPv6 messages.

This statement is correct. IPv6 RS and RA messages are types of ICMPv6 messages.

B. IPv6 RA messages can help host devices perform stateful or stateless address autoconfiguration; RS messages are sent by hosts to determine the addresses of routers.

This statement is also correct. IPv6 RA messages contain information that is used by hosts to configure their network interfaces, including IP addresses and other network parameters. Hosts send RS messages to learn the addresses of routers on the network.

C. RS and RA packets are always sent to an all-nodes multicast address.

This statement is incorrect. IPv6 RS and RA messages are sent to specific multicast addresses. RS messages are sent to the all-routers multicast address, while RA messages are sent to the all-nodes multicast address.

D. RS and RA packets are used by the duplicate address detection function of IPv6.

This statement is incorrect. Duplicate address detection is a separate function that is used by hosts to ensure that their configured addresses are not already in use on the network. It is not directly related to the RS and RA messages.

E. IPv6 hosts learn connected router information from RA messages which may be sent in response to an RS message.

This statement is correct. When a host sends an RS message, routers on the network respond with RA messages that contain information about the network configuration, including the addresses of the routers themselves. Hosts use this information to configure their network interfaces.

F. RS and RA packets are used for IPv6 nodes to perform address resolution that is similar to ARP in IPv4.

This statement is incorrect. IPv6 uses a different mechanism for address resolution, called neighbor discovery, which is part of the ICMPv6 protocol. The RS and RA messages are not used for address resolution.