Cisco Certified Network Associate (CCNA) Practice Exam

How can EIGRP for IPv6 be disabled on an interface?

1. interface INTERFACE

2. no ipv6 eigrp AS NUMBER

3. show ipv6 eigrp interfaces

4. ipv6 router eigrp AS NUMBER

The correct answer is: no ipv6 eigrp AS NUMBER

Disabling EIGRP for IPv6 on an interface requires using the command that specifically removes the EIGRP process associated with that interface. The command "no ipv6 eigrp AS NUMBER" effectively disables EIGRP for the specified Autonomous System (AS) on the interface in question. When this command is issued, the EIGRP routing process is no longer active for that interface, preventing it from participating in EIGRP routing updates. This can be important for managing EIGRP configurations and ensuring that specific interfaces do not participate in the routing process due to design decisions or troubleshooting needs. The other options presented do not achieve the task of disabling EIGRP for IPv6 on an interface. For instance, entering the "interface INTERFACE" command simply allows you to configure the specific interface but does not disable anything. The "show ipv6 eigrp interfaces" command provides information about the interfaces participating in EIGRP but does not modify their configuration. Lastly, "ipv6 router eigrp AS NUMBER" is a command used to enable the EIGRP process for a specified AS, rather than disabling it. Thus, the correct choice directly aligns with the action required to disable EIGRP on an interface effectively.