If the objective of routing is to find the path with the largest available bandwidth (called widest path), how do we define the link cost? What needs to be changed when computing the path cost? (Not...

If the objective of routing is to find the path with the largest available bandwidth (called widest path), how do we define the link cost? What needs to be changed when computing the path cost? (Not just adding link costs into the path cost!)

What is longest prefix matching? Why should the router use longest prefix matching? Will this still be a problem for IPv6? (Why and why not, justify your answer.)