A. IPOS Project 1) Project Description: This project is a large-sized project to develop an Intelligent Power Optimization System (IPOS). 2) Project attributes of the IPOS project : (i) Project Size: Large (between 1000 to 4000) (ii) Project Complexity: Very High (iii) Requirement Volatility: Very Low (iv) Degree of Criticalness: High (v) Time and cost constraint: Low (vi) existing Project for the domain: Existingi. Describe the most appropriate software development methodology options to be chosen by the system analyst, discuss the reasons for choosing these options ii. Discuss the set of requirements elicitation techniques selected by the requirement Analysts, give the reason for selecting each of them.

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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?

Q14 what is most important for you to choose before you build a network? a. private network b. nos c. network media d. network protocol e. directory service