Which command automatically generates an IPv6 address from a specified IPv6 prefix and MAC address of an interface?
Correct answer:
Automatic IPv6 address generation with EUI-64
When configuring IPv6 addresses on network interfaces, it is sometimes necessary to generate addresses automatically. One of the most common methods is to use EUI-64. But what is EUI-64?
EUI-64 is a standard that converts a 48-bit MAC address, commonly used to identify network interfaces, into a unique 64-bit identifier. In the context of IPv6, this is extremely useful, as it allows an interface to automatically generate the “host” part of its IPv6 address from its MAC address.
To use this feature on Cisco equipment, the command is “ipv6 address [préfixe] eui-64”. When this command is applied to an interface, it generates its IPv6 address using the prefix provided and filling in the last 64 bits with the EUI-64 identifier derived from its MAC address.
As future network professionals, it’s essential to understand not only how to configure addresses, but also how they are generated and which methods offer the most efficiency and security.
