Global unicast includes all prefixes unless reserved for other purposes. Although 2 & 3 fall in that range, they are not the only assignable global unicast addresses.
D. FF02::1 - This is the all-nodes multicast address. It is used to reach all devices on a local-link (same subnet).
E. FF02::2 - This is the all-routers multicast address. It is used to reach all routers on a local-link.
A. 2000::/3 and C. FC00::/7 are not multicast addresses, 2000::/3 is an unicast address range, FC00::/7 is an unique-local address range, both are unicast address ranges. B. 2002::5 is not a multicast address either, it's an unicast address.
It's important to note that multicast addresses are used to reach a group of devices instead of a single device, unlike unicast addresses.
Ref: IP Multicast: PIM Configuration Guide, Cisco IOS Release 15SY
“C H A P T E R 3
…
Information About Configuring Basic IP Multicast in IPv6 Networks
…
IPv6 Multicast Groups
An IPv6 address must be configured on an interface before the interface can forward IPv6 traffic. Configuring a site-local or global IPv6 address on an interface automatically configures a link-local address and activates IPv6 for that interface. Additionally, the configured interface automatically joins the following required multicast groups for that link:
…
• All-nodes link-local multicast group FF02::1
• All-routers link-local multicast group FF02::2
…”
Answer: D. FF02::1 and E. FF02::2
Explanation: IPv6 multicast groups are joined when configuring IPv6 on an interface. The two IPv6 multicast groups that are joined are FF02::1 and FF02::2. FF02::1 is the all-nodes multicast group and FF02::2 is the all-routers multicast group.
For router to act like IPv6 router (to get it joined to FF02::2 is all-routers multicast group), we need to issue "ipv6 unicast-routing" command. That means configuring only interface with IPv6 address does not mean it will definitely join FF02::2 group unless you add "ipv6 unicast-routing" command on global config mode
Thanks for adding this helpful configuration critical information.
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