Consider a router that interconnects three subnets: subnet 1, subnet 2, and subnet 3. suppose all of the interfaces in each of these three subnets are required to have the prefix 223.1.17/24. also suppose that subnet 1 is required to support at least 60 interfaces, subnet 2 is to support at least 90 interfaces, and subnet 3 is to support at least 12 interfaces. provide three network addresses (of the form a. b.c. d/x) that satisfy these constraints.

3. bob is arguing that if you use output feedback (ofb) mode twice in a row to encrypt a long message, m, using the same key each time, it will be more secure. explain why bob is wrong, no matter what encryption algorithm he is using for block encryption (15 points).

What is a distinguishing feature of today’s graphic application software?) graphic applications are used today on a variety of devices, including touch-screen kiosks and mobile phones.

Implement a document scanning function wordcountengine, which receives a string document and returns a list of all unique words in it and their number of occurrences, sorted by the number of occurrences in a descending order. if two or more words have the same count, they should be sorted according to their order in the original sentence. assume that all letters are in english alphabet. you function should be case-insensitive, so for instance, the words “perfect” and “perfect” should be considered the same word.