ocr: BACKUP TO FAILURE Backbone Backbone 2 Backbone - Backbone 2 192.168.1.0/24 192.168.2.0/24 192.168.1.0/24 192.168.2.0/24 Failed 8 link - 1681 - 68 a 121812 Foiled Fanure link Ra Rb Ra: b 2 Network A Network A 192.168.3.0/24 192.168.3.0/24 Figure 4: Figitr 40 Uas Ra uplink atlins ad Figure AD strar a ruiter Rafoilure.