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... the port in a basic router and activate the port in a spare router. But if a number of devices can connect with a router and connect the half of this number in each network, addresses must not be repeated in the two networks. This so- lution will decrease the risk factor and connect a number of devices in a network together. Ex As shown in Fig. 4 connected N1 with port in R1 basic and with R2 spare, if any DoS attack happen in R1 AS. will deacti- vate R1 and activate R2. In this case the risk factor will be de- creased to zero and the same will happen between N2, N3. ...