1) A /20 block of addresses is granted to an organization. We know that one of the addresses is 129.118.40.12. How many IP addresses are contained in this subnet? What is its x.y.z.t representation?

2) illustrate how the three nodes exchange and update their distance table to converge, when the link cost between the three nodes are: c(x,y)=3, c(y,z) = 6, c(x,z) = 2.