Cisco Certified Network Associate (CCNA) Practice Exam

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What is a correct characteristic of IPv6 interfaces?

Every IPv6 interface must contain two loopback addresses.
Every IPv6 interface contains at least one loopback address.
A single interface may only have one IPv6 address.
The first 64 bits of an IPv6 address are reserved for the dynamically created interface ID.

The correct answer is: Every IPv6 interface contains at least one loopback address.

Every IPv6 interface must contain at least one loopback address, which is a designated address used to facilitate testing and communication within the host itself. The loopback address in IPv6 is represented as ::1, serving a similar purpose as the 127.0.0.1 address in IPv4. It allows for communication without needing external network resources, making it an essential feature for troubleshooting and validating stack functionality on the local device. Furthermore, while it is true that there can be multiple global or link-local addresses assigned to an interface, the requirement for at least one loopback address stands out and is a fundamental characteristic of IPv6 interfaces. This reinforces the design's intent to provide a reliable way for devices to self-test and communicate internally without depending on the external network configuration.