Which two options can you use to configure an EIGRP stub router?

The valid EIGRP stub options listed are receive-only and summary. Cisco EIGRP stub routing lets a remote or spoke router advertise only selected route types to upstream neighbors, which reduces query scope and improves stability in hub-and-spoke designs. The summary option permits the stub router to advertise summary routes. The receive-only option makes the router receive routes but not advertise routes, which is useful when the device should not be considered a transit or route source. “External” is also a real EIGRP stub keyword in Cisco IOS, but in this specific option set the verified pair expected by the question is receive-only and summary. “Summary-only” is not the correct EIGRP stub keyword. “Totally-stubby” and “not-so-stubby” are OSPF area concepts, not EIGRP stub router options. In design terms, EIGRP stub routing is used to prevent unnecessary queries from being sent toward routers that cannot provide alternate paths. This is especially important for low-resource branch routers and DMVPN spokes, where limiting control-plane workload directly improves convergence behavior.