RIPng vs RIPv2

Routing Information Protocol next generation (RIPng) is a distance vector protocol that uses hop count as the metric. If a device has two paths to the destination network, the path with fewer hops will be chosen as the path to forward traffic.

RIPng operates using UDP port 521 for the transport layer protocol.

Routing Information Protocol next generation (RIPng) is enabled on an interface using the "ipv6 rip name enable interface" subcommand. If IPv6 is not enabled on the interface and you are trying to enable this same interface for RIPng, the "ipv6 rip name enable" command will be rejected.

RIPv2 sends routing updates via multicast address 224.0.0.9. RIPng uses multicast address FF02::9 to send routing updates.

RIPv2 advertises routes for IPv4 and uses IPv4 for transport. RIPng advertises routes for IPv6 and uses IPv6 for transport.

Question: Which command do you need to use to allow RIPv2 to advertise a route out of an interface from which the routing information originated?

A. ip summary-address rip

B. no validate-update-source

C. no ip split-horizon

D. default-information originate

Correct answer: C

Explanation: The split horizon feature is used to reduce the possibility of routing loops by preventing information about routes from being advertised out any interface from which the routing information originated. However, there are some network types, such as Frame Relay, that you may want the routing updates to be advertised out of an interface from which the information originated. The no ip split-horizon interface configuration command can be used to disable split horizon on the interface and allow the routes to be advertised.
Source IP addresses of incoming RIP routing updates are validated by default. The routing updates are discarded if the source address is not valid. The no validate-update-source command prevents the source IP address of incoming RIP routing updates from being validated. The no validate-update-source command is not used to allow RIPv2 to advertise a route out of an interface from which the routing information originated.
The default-information originate command is used to allow a router that is running RIP to source the default network. The default-information originate command is not used to allow RIPv2 to advertise a route out an interface that the routing information originated.
The ip summary-address rip command is used to configure the router to summarize routes that are learned via RIPv2 or that has been redistributed into RIPv2. The ip summary-address rip command is not used to allow RIPv2 to advertise a route out of an interface that the routing information originated.