What is the link-local all-nodes IPv6 multicast address?
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Correct answer: ff02:0:0:0:0:0:0:1.
Why this is the answer
The correct answer is ff02:0:0:0:0:0:0:1. This is the well-known IPv6 link-local all-nodes multicast address. Devices on the same local link use this address to communicate with all other IPv6-enabled devices on that link. It's similar to the IPv4 broadcast address but for multicast. The other options are incorrect: 2004:33c:94d9:431e:255:: and fffe:034:0dd:45d6:789e:: are examples of global unicast addresses, which are routable and unique across the internet. fe80:4433:034:0dd::2 is an example of a link-local unicast address, used for communication only on a single link and not routable.
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