IPv6 Address Scope

Correct Answer: Multiple devices might simultaneously try to answer a request

If a device is assigned a multicast address, it means that the address is not unique. In a network, each device should have a unique address to ensure accurate data communication. Therefore, when a multicast address, intended for multiple devices, is assigned to a single device, other devices with the same address might simultaneously try to answer a request leading to complications in the network operation. The other answers are incorrect because: 1. A device with a multicast address can communicate, but with issues. 2. The situation does not relate to IPv6 data transmission rates. 3. It will certainly not work as intended due to the potential conflicts in device addressing.

Correct Answer: Anycast address

The correct address to which firewall rules should be applied in an IPv6 network with devices using Anycast addresses is the Anycast address. An Anycast address is a global address, which is assigned to more than one interface, usually belonging to different nodes. When a packet is sent to an Anycast address, it's delivered to the closest interface (in terms of routing distance) having that address. Therefore, applying firewall rules to the Anycast address ensures the appropriate rules apply no matter to which device the packet is delivered. Unicast addresses are wrong because firewall rules applied to them would only affect the specific device with that address, not all devices using an Anycast address. Link-local and Unique Local addresses are also wrong because these addresses are not used in routing on the IPv6 internet and therefore are not relevant when configuring a firewall for devices using Anycast addresses.

Correct Answer: Global Unicast

Global Unicast should be used after the merge as it is intended for inter-organizational communications and works across the entire IPv6 Internet. Site-local is only valid within the site and cannot be used for inter-organizational communication. Link-local is used for communication on the local network link and is not valid beyond that link. Unique Local is meant for local communication within a specific region and is not routable over the internet. So, Global Unicast is the most suitable for interconnecting two different company networks.