Cisco Certified Network Associate (CCNA) Practice Exam

Which of the following statements about IPv6 addresses is true?

1. There are three types of IPv6 addresses: unicast, multicast, anycast, and broadcast.

2. A single interface may be assigned multiple IPv6 addresses of any type.

3. The first 32 bits represent the interface ID.

4. Leading zeros in an IPv6 address are mandatory.

The correct answer is: A single interface may be assigned multiple IPv6 addresses of any type.

The statement that a single interface may be assigned multiple IPv6 addresses of any type is indeed correct. In IPv6, it is common and permissible for a single network interface to have multiple types of addresses assigned to it, including unicast, multicast, and anycast addresses. This allows for a more flexible addressing system, enabling hosts to engage in various types of communications simultaneously. For example, a device can have a unique unicast address for its primary communications while also belonging to multiple multicast groups and having anycast addresses to facilitate certain types of routing. In contrast, the reference to three types of IPv6 addresses includes a mention of broadcast, which is incorrect since IPv6 does not use broadcast addresses. Instead, it employs unicast, multicast, and anycast. Furthermore, the assertion about the first 32 bits representing the interface ID is incorrect; in IPv6, the first 64 bits typically represent the network prefix, while the interface ID, which is unique within that network, makes up the remaining 64 bits. Lastly, leading zeros in an IPv6 address are not mandatory, as they can be omitted to simplify the address notation.