Which command enables a router to configure a link-local address without using an IPv6 DHCP server?

Which command enables a router to configure a link-local address without using an IPv6 DHCP server?

• A. ipv6 enable
• B. ipv6 unicast-routing
• C. ipv6 dhcp enable
• D. ipv6 address autoconfig

Answer: (B)

The command that enables a router to configure a link-local address automatically is related to the process of link-local address generation. In IPv6, a link-local address is generated based on the interface's MAC address and does not require a DHCP server for its configuration. The correct command, "ipv6 address autoconfig," allows the interface to automatically create a link-local address. When this command is applied, the router uses the interface's MAC address to form the link-local address in accordance with the IPv6 addressing rules. This capability is inherent to IPv6 and is automatically executed on an interface configured with IPv6, ensuring that the router can communicate on the local link even without outside DHCP intervention. In this case, the other options focus on different functionalities unrelated to automatic link-local address configuration. The command related to enabling IPv6 routing is relevant but does not specifically pertain to link-local addresses. Similarly, another option refers to enabling IPv6 DHCP, which is not applicable since the question specifically asks how to configure a link-local address without using DHCP. Hence, the focus on the correct command reveals its significance in achieving the automatic configuration of link-local addresses.

The command that enables a router to configure a link-local address automatically is related to the process of link-local address generation. In IPv6, a link-local address is generated based on the interface's MAC address and does not require a DHCP server for its configuration.

The correct command, "ipv6 address autoconfig," allows the interface to automatically create a link-local address. When this command is applied, the router uses the interface's MAC address to form the link-local address in accordance with the IPv6 addressing rules. This capability is inherent to IPv6 and is automatically executed on an interface configured with IPv6, ensuring that the router can communicate on the local link even without outside DHCP intervention.

In this case, the other options focus on different functionalities unrelated to automatic link-local address configuration. The command related to enabling IPv6 routing is relevant but does not specifically pertain to link-local addresses. Similarly, another option refers to enabling IPv6 DHCP, which is not applicable since the question specifically asks how to configure a link-local address without using DHCP. Hence, the focus on the correct command reveals its significance in achieving the automatic configuration of link-local addresses.