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Here is my topology and my problemRouter (R1)Serial 1/1 connected to s1/1 of R2 12.0.0.1/30Loopback 0 100.0.0.1/24Router (R2)Serial1/1 connected to s1/1 of R1 12.0.0.2/30Serial1/3 connected to s1/3 of R3 23.0.0.1/30Serial1/2 connected to s1/1 of...