For this exercise, you are going to create a part of an Animal hierarchy. Unlike some of our examples and the previous exercises, this exercise is going to have 3 levels in the hierarchy. At the top is the Animal class. Below that, we are going to have a subclass for Pets. Under pets, we are going to have 2 subclasses, Dogs and Fish. You will need to create your class hierarchy and add instance variables, getters, and setter methods to accommodate the following information: I need to save what type of animal I have (String variable) I want to be able to save a name for my fish and dog (String variable) I want to know which fish need salt water v. fresh water (String variable) I want to know if my dog has been trained (boolean variable) I want to know the size of my dog and fish (String variable) None of your classes should have constructors. Instead, create setter and getter methods to set the value of the instance variables that you create. Make sure you use common sense names for your variables!

Some of the first computer games were created in the early 1970s by college students experimenting after hours to see what the were capable of doing.

Consider a slotted aloha system, where the time slot equals the fixed duration of each packet. assume that there are 4 stations a,b,c,d sharing the medium. (a) stations a,b,c,d receive one packet each from higher layers at times 1.3, 1.5, 2.6,5.7 respectively. show which transmissions take place when, according to the slottedaloha protocol; describe all transmissions until all four packets have been successful.when needed, each station has access to the following sequence of random number, provided by a random number generator and drawn uniformly between 0 and 1: (1) station a draws numbers: 0.31, 0.27, 0.78, 0.9, 0.9, 0.11, 0. (2) station b draws numbers: 0.45, 0.28, 0.11, 0.83, 0.37, 0.22, 0. (3)station c draws numbers: 0.1, 0.2, 0.3, 0.4, 0. (4) station d draws numbers: 0.36, 0.77, 0.9, 0.1, 0.1, 0.1, 0.1, 0. (b) in slotted aloha, a station transmits in each time slot with a given probability. what probabilities would you assign to each of the four stations so as to: (i) maximize the efficiency of the protocol? (ii) maximize fairness among the four stations? (c) will the efficiency increase or decrease if we modify slotted aloha as follows: (i) get rid of slots and allow stations to transmit immediately? (ii) implement carrier sensing? (iii) implement collision detection? (iv) implement collision avoidance?

My has been slow anyone else’s ?