In EIGRP (Enhanced Interior Gateway Routing Protocol), a stub router is one that is connected to one or more neighbors and should not be a transit router1. The EIGRP stub routing feature improves network stability, reduces resource utilization, and simplifies the stub router’s configuration1.

The network engineer wants to configure an EIGRP stub router that advertises only connected and summary routes. This can be achieved with the configuration provided in Option B:

router eigrp 100

eigrp stub summary

This configuration ensures that the EIGRP stub router advertises only connected and summary routes12. The summary keyword after the eigrp stub command indicates that the router should advertise only auto-summarized or statically configured summary routes12.