Cisco Certified Network Associate (CCNA) Practice Exam

What command is used to enable OSPF on a specific interface in an IPv6 network?

1. ipv6 ospf PROCESS NUMBER area AREA NUMBER

2. router ospf PROCESS NUMBER

3. enable ospf INTERFACE

4. configure ospf area AREA

The correct answer is: ipv6 ospf PROCESS NUMBER area AREA NUMBER

The command used to enable OSPF (Open Shortest Path First) on a specific interface in an IPv6 network is "ipv6 ospf PROCESS NUMBER area AREA NUMBER." This command must be entered in the interface configuration mode. In this command, the "PROCESS NUMBER" refers to the OSPF routing process identifier that is locally significant and helps in differentiating multiple OSPF instances on the same router. The "AREA NUMBER" indicates the OSPF area to which this interface belongs, which is essential for OSPF's hierarchical structure that allows for more efficient routing within large networks. Utilizing this command allows the router to participate in OSPF operations on that specific interface, advertising its routes and learning about intersecting routes from other routers within the specified area, thus enabling dynamic routing in the IPv6 network. This is a crucial step in the configuration of OSPF, as only interfaces explicitly configured to run OSPF will take part in the OSPF routing process. The other options either pertain to different aspects of OSPF configuration or do not apply to enabling OSPF on a specific interface, which is why they do not fulfill the requirement of the question.