Cisco Certified Network Associate (CCNA) Practice Exam

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What command is used to enable RIPv2 on a Cisco router?

router rip
router eigrp
router ospf
ip routing

The correct answer is: router rip

To enable RIPv2 on a Cisco router, the command "router rip" is significant because it initiates the Routing Information Protocol (RIP) process within the router's configuration mode. When this command is entered, the router recognizes that the user intends to configure the RIP routing protocol. Following the execution of the "router rip" command, the administrator can then specify the RIP version by using "version 2" if required, allowing the router to utilize RIPv2's features, such as supporting classless routing and sending subnet mask information along with route advertisements. This is essential for modern networks that often include variable-length subnet masking (VLSM) and classless inter-domain routing (CIDR). The other commands listed would initiate different routing protocols or settings. "router eigrp" is used to enable the Enhanced Interior Gateway Routing Protocol (EIGRP), "router ospf" initiates the Open Shortest Path First (OSPF) protocol, and "ip routing" enables IP routing on the device but does not specifically configure a routing protocol like RIPv2. Therefore, the command "router rip" is the appropriate choice for enabling RIPv2 on a Cisco router.