R3#sh run | b router eigrp
router eigrp 100
 network 17.80.1.1 0.0.0.0
 network 208.28.1.2 0.0.0.0
 no auto-summary
!


R4#sh run | b router
router eigrp 100
 network 17.80.0.1 0.0.0.0
 network 17.80.1.2 0.0.0.0
 network 17.80.2.1 0.0.0.0
 network 17.80.3.1 0.0.0.0
 no auto-summary
!