When configuring IPv6 on an interface, which two IPv6 multicast groups are joined? (Choose two.)
When configuring IPv6 on an interface, which two IPv6 multicast groups are joined? (Choose two.)
When configuring IPv6 on an interface, the interface automatically joins two important IPv6 multicast groups. The first group is FF02::1, known as the all-nodes multicast group. This group is used to communicate with all IPv6-enabled devices on the local link. The second group is FF02::2, known as the all-routers multicast group. However, it's important to note that an interface will only join the FF02::2 group if the device is functioning as a router, which generally requires the 'ipv6 unicast-routing' command to be issued in the global configuration. These multicast addresses are essential for the basic operation and communication within an IPv6 environment.
Multicast - FF Global Unicast - 2/3 Unique Local - FC/FD Link Local - FE80
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.
All-nodes link-local multicast group FF02::1 All-routers link-local multicast group FF02::2
Answer is D. FF02::1 (All Nodes Multicast) E. FF02::2 (All Routers Multicast) These multicast addresses are automatically joined by IPv6-enabled interfaces.
Tested. This is the correct answer.
When configure Ipv6 the interface will join multicast groups as follows as per answer If its a node :FF02::1 If its a router :FF02::2
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
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.
FF02::1 - all nodes/hosts FF02::2 - all routers
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DE Selected FF is link-local multicast group
All-nodes link-local multicast group FF02::1 All-routers link-local multicast group FF02::2
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.
DE correct answer
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