IPv6 Unicast Addressing Characteristics | Cisco Exam 200-125

IPv6 Unicast Addressing

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Which two statements describe characteristics of IPv6 unicast addressing? (Choose two.)



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A. B. C. D. E.


IPv6 unicast addressing is used to identify a single network interface on a node. Here are the two statements that describe characteristics of IPv6 unicast addressing:

A. Global addresses start with 2000::/3:

Global unicast addresses are used on the Internet, and their first three bits are always set to 001. This means that they start with 2000::/3. The first three bits of an IPv6 address are used to identify the address type, and global unicast addresses are just one of the many types of addresses that can be used in IPv6. The remaining 61 bits in a global unicast address are used to identify the network and interface.

B. Link-local addresses start with FE80::/10:

Link-local addresses are used for communication between nodes on the same link or network segment. Their first ten bits are always set to 1111 1110 10, which means they start with FE80::/10. Link-local addresses are automatically configured on each interface of an IPv6-enabled device, which means that every IPv6-enabled device will have at least one link-local address. Link-local addresses are not routable, which means they cannot be used to communicate between nodes on different network segments.

C. Link-local addresses start with FF00::/10:

This statement is incorrect. The correct starting value for link-local addresses is FE80::/10.

D. There is only one loopback address and it is ::1:

In IPv6, the loopback address is always ::1. It is similar to the IPv4 loopback address of, and it is used by a node to send traffic to itself. There is only one loopback address in IPv6, and it is always assigned to the loopback interface.

E. If a global address is assigned to an interface, then that is the only allowable address for the interface:

This statement is incorrect. A network interface in IPv6 can have multiple addresses, including multiple global unicast addresses. An interface can also have link-local addresses and anycast addresses in addition to global unicast addresses. This allows for more flexible addressing and better network design.