Solution:
Router_B
hostname Router_B
enable secret 5 ...
$1$eZ3D$vnTjKaCLtbSCcMF1mGzZm0
enable password ccnaprep
!
frame-relay switching
isdn switch-type ntt
!
interface Serial0
no ip address
no ip mroute-cache
shutdown
no fair-queue
clockrate 4000000
!
interface Serial1
encapsulation frame-relay
no ip mroute-cache
keepalive 15
clockrate 2000000
frame-relay lmi-type cisco
frame-relay intf-type dce
frame-relay route 100 interface Serial2 ...
200
!
interface Serial2
encapsulation frame-relay
frame-relay lmi-type ansi
no ip mroute-cache
keepalive 15
clockrate 115200
frame-relay intf-type dce
frame-relay route 200 interface Serial1 ...
100
!
interface Serial3
no ip address
no ip mroute-cache
shutdown
no cdp enable
!
interface TokenRing0
no ip address
no ip mroute-cache
shutdown
no cdp enable
!
interface BRI0
no ip address
no ip mroute-cache
shutdown
no cdp enable
!
ip classless
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
password ccieprep
login
end
Router_C
Current configuration:
!