Case proiect 6-1 as the network administrator for a growing isp, you want to make efficient use of your network addresses. one of the network addresses iana assigned to you is a class c network of 197.14.88.0. you have decided to use the addresses in this class c network to satisfy the ip address requirements of 16 corporate customers who need between 10 and 14 addresses each. calculate a subnet mask that meets their needs. list the subnet mask and the first four subnet addresses the mask will create.

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?