Refer to the exhibit. What is the function of the Null0 route in the outputs displayed for R1 and R2?
- to advertise the local /48 summary route
- to force advertisements of only the /64 route entries to the neighbor routers
- to force advertisements of only the /128 route entries to the neighbor routers
- to invoke the split horizon rule to prevent routing loops
Explanation: In EIGRPv6, a Null0 route with an administrative distance of 5 is added to the routing table as a loop-prevention mechanism. Only the /48 summary prefix is received from the neighbor router and any of the more specific /64 and /128 route entries are suppressed. In this instance a Null0 route is populated on the router for the local /48 summary route advertisement.
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