8.2.7 Check Your Understanding – SLAAC Answers

1. Which two ICMPv6 messages are used in the SLAAC process? (Choose two.)

  • Neighbor Advertisements (NA)
  • Neighbor Solicitation (NS)
  • Router Solicitation (RS)
  • Router Advertisements (RA)

Explanation: The SLAAC process uses RA messages and can also respond to RS messages from a host.

2. Which command must be configured on a router to enable it to join the IPv6 all-routers multicast address ff02::2?

  • ip routing
  • ipv6 unicast-routing
  • ipv6 address ipv6-address/prefix-length
  • ipv6 address ipv6-address link-local

Explanation: The ipv6 unicast-routing global config command is required for a router to join the IPv6 all-routers group.

3. What are the flag settings when a host should use the SLAAC only option?

  • A=1, M=0, O=0
  • A=1, M=1, O=0
  • A=1, M=0, O=1
  • A=0, M=1, O=1

Explanation: SLAAC sets the flags to A=1. M=0, O=0.

4. Which ICMPv6 message is sent by a host in an attempt to locate an online IPv6enabled router to obtain IPv6 addressing information?

  • Neighbor Advertisements (NA)
  • Neighbor Solicitation (NS)
  • Router Solicitation (RS)
  • Router Advertisements (RA)

Explanation: A host sends a Router Solicitation (RS) message to the IPv6 all-routers group to locate an online router.

5. What method is used by a host to verify an IPv6 address is unique on the local network before assigning that address to an interface?

  • ARP
  • DAD
  • PING
  • SLAAC

Explanation: A host uses DAD to ensure an IPv6 address is unique on the local network.

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