Cisco Certified Network Associate (CCNA) Practice Exam

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Study for the Cisco Certified Network Associate (CCNA) exam with our comprehensive quiz featuring multiple-choice questions and detailed explanations. Prepare effectively and enhance your understanding of networking concepts!

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Which address type is represented by 0:0:0:0:0:0:0:1?

Unspecified
Loopback
Link-Local Unicast
Unique Local Address

The correct answer is: Loopback

The address represented by 0:0:0:0:0:0:0:1 is indeed a loopback address in IPv6. Loopback addresses are used by a host to send packets to itself, which can be useful for testing the network stack locally without sending traffic on the network. In IPv6, the loopback address is specifically defined as ::1, which is a shorthand for 0:0:0:0:0:0:0:1. While other address types are important within the IPv6 addressing architecture, they serve different purposes. The unspecified address, represented as :: (or 0:0:0:0:0:0:0:0), is used to indicate the absence of an address. Link-local unicast addresses are used for communication within the same local network segment and typically start with the prefix FE80::/10. Unique local addresses are similar to private addresses in IPv4, designed for local communications within a network and beginning with the prefix FC00::/7. Recognizing the specific function of various address types in IPv6 is key to understanding how devices communicate within and outside of their local networks, with loopback serving a crucial role in self-testing and debugging.