This number right here matches the feasibility distant third saying okay this number is the best cost past this best cost period to this destination subnet 172 16 20 dot are 22 to 0 through next hop router 20 dot to what this is this is the next hop routers cost so it throws the next top routers cost in them there is an additional route this is thefeasible successor its 642-813  entered into the Paul Datable because it meets that feasibility condition next top router 172 1621 not to destination summit 22 got 0 it would cost 4673 8176 to get to the 2207 that through this next hop router and the reason it entered into the routing table is because the next hop router has a cost a 2169 856 which is lower van the successor cost up to 69 to 856 so since this next hop router has a lower cost than the best cost past that this router has to the destination it's allowed to get entered in to the topology table the feasible successor because this router knows that this router right here twenty 1.2 willnot try to send the packet back  642-813  through people Esther one router to ghetto the destination sewing noses no routing loop if this number right here was a 27 69 this information would not get entered in the party table would be ignored because the next-hop router has higher-cost than this router has to get to the destination.

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