Cisco Certified Network Associate (CCNA) Practice Exam

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What command configures an interface as passive on an EIGRP for IPv6 router?

passive-interface INTERFACE
show ipv6 protocols
interface INTERFACE
ipv6 hello-interval OR hold-time TIME NUMBER

The correct answer is: passive-interface INTERFACE

The command that configures an interface as passive on an EIGRP for IPv6 router is "passive-interface INTERFACE." This command prevents EIGRP from sending or receiving routing updates on the specified interface while still allowing the interface to participate in EIGRP's routing decisions. This is particularly useful in scenarios where you want to maintain the integrity of routing information on certain interfaces, such as connections to end hosts or in areas where you do not want EIGRP updates to be propagated, thereby reducing unnecessary overhead and potential exposure of routing information. The other options provided serve different purposes: - "show ipv6 protocols" is used to display information about the EIGRP configuration and status but does not alter the configuration of any interface. - "interface INTERFACE" is a command used to enter the interface configuration mode but does not itself create any passive configuration. - "ipv6 hello-interval OR hold-time TIME NUMBER" pertains to adjusting the timing parameters for EIGRP hello packets and hold times, which are related to maintaining neighbor relationships rather than specifically configuring an interface as passive. Thus, "passive-interface INTERFACE" is the appropriate command for making an interface passive in EIGRP for IPv6 configurations.