What are two characteristics of the SLAAC method for IPv6 address configuration? (Choose two.)

  • Clients send router advertisement messages to routers to request IPv6 addressing.
  • IPv6 addressing is dynamically assigned to clients through the use of ICMPv6.
  • This stateful method of acquiring an IPv6 address requires at least one DHCPv6 server.
  • The default gateway of an IPv6 client on a LAN will be the link-local address of the router interface attached to the LAN.
  • Router solicitation messages are sent by the router to offer IPv6 addressing to clients.
Explanation & Hint:

SLAAC, or Stateless Address Autoconfiguration, is a method that allows devices on an IPv6 network to automatically configure their own IP addresses without the need for a centralized server like DHCPv6. Here are two characteristics of the SLAAC method:

  1. IPv6 addressing is dynamically assigned to clients through the use of ICMPv6: With SLAAC, IPv6 addresses are generated by clients using a combination of locally available information and router advertisements. The Internet Control Message Protocol version 6 (ICMPv6) is used by routers to announce their presence and by hosts to configure their own IPv6 address based on the prefix advertised by the router.
  2. The default gateway of an IPv6 client on a LAN will be the link-local address of the router interface attached to the LAN: In a SLAAC configuration, the router’s link-local address is used as the default gateway for devices on the network. The link-local address is derived from the router’s interface MAC address and the FE80::/10 prefix.

The other options listed are not characteristics of SLAAC:

  • Clients send router advertisement messages to routers to request IPv6 addressing: This is incorrect. In SLAAC, routers send Router Advertisement (RA) messages that clients listen for. Clients do not request addressing; they listen for these unsolicited RA messages.
  • This stateful method of acquiring an IPv6 address requires at least one DHCPv6 server: SLAAC is stateless and does not require a DHCPv6 server. A stateful method that requires a DHCPv6 server would be DHCPv6 itself, not SLAAC.
  • Router solicitation messages are sent by the router to offer IPv6 addressing to clients: This is incorrect. Router solicitation messages are sent by clients when they first start up to prompt routers to send a Router Advertisement immediately rather than at their next scheduled time.

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