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OCR: RETURNING CONNECTIVITY THROUGH ALTERNATE PUC PATHS Permanent Virtual Circuit PVC-L PVC:5 PVC-3 P.VC'4 Routerif Figure 2. One technique for verifying connectivity is to try to reach the potentially downed device directly. If you can't reach the device in question directly, try using a backdoor Il" address In this example, traffic can't pass from Router 1 10 Rouler 2 vid PVC-1, but an alternate path via PVC-2 and PVC-5 can be used to attempt a linkup with Routter 2.