| 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:
- 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.
- 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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