networking - Numerical on Distance Vector Algorithm -

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i solving assignment on routing protocols , following question came up. unable come solution. please help.

a network of 4 routers a, b, c , d arranged this: 

a_____b_____c_____d    3     2     1

the routers use distance vector routing, using number of hops metric. value “8” used routers indicate “infinity” (to conclude router unreachable).

the link c-d goes down.

a. how many exchanges require each of them conclude d unreachable? @ each exchange, show distances routers maintain router d.

b. assume routers follow split horizon. how many exchanges needed routers conclude d unreachable? @ each exchange, show distances routers maintain router d.

solution

i wrote hand, hope legible. solution part (a).


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