Cisco Certified Network Associate (CCNA) Practice Exam

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Which IPv6 address indicates a loopback function?

0:0:0:0:0:0:0:1
2000::/3
FF00::/8
FE80::/10

The correct answer is: 0:0:0:0:0:0:0:1

The IPv6 address that indicates a loopback function is represented by 0:0:0:0:0:0:0:1. This address is also commonly written as ::1, utilizing the shorthand notation for IPv6 addresses where consecutive sections of zeros can be collapsed into a double colon. The loopback address in IPv6 serves the same purpose as the IPv4 address 127.0.0.1, providing a method for a device to communicate with itself for testing and configuration purposes. When data is sent to this address, it is looped back to the local machine, allowing for the verification of network stack implementations and configurations without sending packets over an external network. The other address choices have different purposes. For instance, 2000::/3 denotes global unicast addresses that are routable on the internet, while FF00::/8 indicates multicast addresses used to send data to multiple destinations simultaneously. Lastly, FE80::/10 is related to link-local addresses used for communication within a single network segment and is not meant for loopback functions. Understanding these distinctions is crucial for accurate network configuration and management in IPv6.