BITS WILP Software Architecture EC-3

Birla Institute of Technology & Science, Pilani

Work-Integrated Learning Programmes Division

Second Semester 2020-2021

 

Comprehensive Examination

(EC-3 Regular)

 

Course No.                   : SS ZG653  

Course Title                  : SOFTWARE ARCHITECTURES

Nature of Exam             : Open Book

Weightage                    : 45%

Duration                       : 2 Hours 

Date of Exam                : Saturday, 01/05/2021   (FN)

Note:

1.      Please follow all the Instructions to Candidates given on the cover page of the answer book.

2.      All parts of a question should be answered consecutively. Each answer should start from a fresh page. 

3.      Assumptions made if any, should be stated clearly at the beginning of your answer.

 

Q.1Set.(A)      Case Study: Bus Transport Corporation                                                           [28]

 

Company ABC, Ltd has been approached by a City Bus Transport Corporation (CTBC) for a custom development contract. You are the Application Architect at ABC, Ltd. The information shared by CTBC is summarized below

·     CTBC operates about 6000 buses and intends to add another 2000 buses in the next 2 to 3 years; they own 45 depots

·     CTBC has 50 bus stations (terminals) – typically where a trip starts

·     CTBC operates on 400 different routes; they serve people through 3000 bus shelters (bus stops) over and above the bus stations

·     The primary goal of the project is to provide Real-time Information (Bus Timings, ETA etc) on LCD/LED Display Boards at Bus Stops, Bus Terminals and other identified locations.

You, as an architect had discussions with the IT team at CTBC and collected the following information

·       Every bus has a bus id. All the routes are also numbered. On each route, there are multiple trips. A bus on the road is identified by bus-id, route-no and trip-no. It has a start time when the trip starts

·       The size (number of lines) of the display boards varies depending on the location.

·       It is expected that the display shows information about the next few trips

·       CTBC will invest in additional infrastructure to track the buses

·       CTBC team mentioned multiple times about Uber like service

 

In the internal discussions at ABC, it was concluded that Back-end data will be critical for the success of the project. Your GM has asked you to come out with a document with the following information which can be used for further discussions. He has asked you to make appropriate assumptions.

 

(a)           Create a Solution Design – how will the application achieve the primary objective

(b)          Draw the module view of the application(s) involved in the system, with a one-line description of each module; high light various HW components needed for the system

(c)           Define the back-end data format and contents, that will enable the display, how does the data get updated?

(d)          Recommend a cloud-based architecture. Represent it with a diagram (s). Highlight architecture style (s), pattern(s) and relevant tactics

(e)           Highlight specific patterns for high availability and scalability (Note: they are adding additional busses)

(f)            One of the key success factors for the system is: “the passengers getting the right arrival information about the buses”. Name two quality attributes that will enable this. Justify your answer with detailed explanations.

(g)           With a sequence diagram explain the logic of displaying the arrival information in the Display board kept in the bus shelter

 

 

 

Q.1Set.(B) Case Study: Smart City                                                                                         [28]

 

You are an architect for a set of Smart City Projects in your companies(?). Your company has decided to propose a new project to the Government to increase the use of City Buses in major cities. Your idea came from a limited survey. Many of the existing and potential users of the bus services complained about the lack of arrival information at the bus stops. Your manager asked you to meet with officials in the Transport Corporation to know more about their operation. This is the summary of the meeting

·         A Major transport corporation operates in excess of 5000 buses and typical number routes they serve is about 400. In each route there are minimum of 15 to 20 bus stops.

·         Every bus has been assigned an id number. Every route has an id. There are multiple trips in a route. For example, a bus starting at 8 AM in a route will be called trip 1. The second bus starting at 8:15 in the same route will be call trip 2 etc

·         A bus on the road is identified by bus-id, route-no and trip-no.

You have internal brainstorming on the project. The summary of the meeting is

·       We need to have LCD display boards in each of the bus shelters

·       The LCD should display arrival time of the buses coming to that bus stop

·       Bus Tracking is the key requirement of the project…more like Uber

·       Develop Project document with the following information(?), which can be used for further discussion

 

(a)           Create a Solution Design – how will the application achieve the primary objective

(b)          Draw the module view of the application(s) involved in the system, with a one-line description of each module; High light the various HW components needed for the solution to work

(c)           Define the back-end data format and contents, that will enable the displays; please note the core of the application collect, calculate and display data

(d)          Recommend a cloud-based architecture. Document the architecture with diagrams. Highlight architecture style (s), pattern(s) and relevant tactics

(e)           Highlight specific patterns for high availability and scalability (so that larger coporations can use the solution)

(f)            One of the key success factors for the system is: “the passengers getting the right arrival information about the buses”. Name two quality attributes that will enable this. Justify your answer with detailed explanations.

(g)           With a sequence diagram explain the logic of displaying the arrival information in the Display board kept in the bus shelter

 

Q.1Set.(C) Case Study: Project Green                                                                       [28]

 

You are a senior application architect. At a social gathering, you met with your old friend who is into environment protection. He was worried about the increasing number of private vehicles on the road and was wondering how to encourage people to take public transport. He expects the government to add more buses and feels that could be one of the solutions.

 

After a few days, you need to go to the airport to catch a flight. You notice a few things during your trip to the airport. You book an Uber to come pick you up, there is a notification for ETA (expected time of arrival). When you are in the Uber, you can see the expected time to destination. Even at the airport there are displays showing ETD (expected time of departure) of your flight. You realize that this lack of information at the bus stops probably discourages people in using public bus transport. You decide to work on a potential solution.

 

You did some research and also met with employees in the transport corporation. The summary of your research

·       A bus on the road can be uniquely identified by Bus-Id.Route-No.Trip-No

·       The transport corporation owns many busses

·       They operate on multiple routes

·       Each route had many Bus stops

·       There are multiple trips in each route. For example, when one says that every one hour there are buses between Point A and Point B from 5AM to 10 PM, it means there are 18 trips in that route.

·       Bus tracking is the key problem to be solved

 

You discuss this with your colleagues and as a first step decide to create a document with the following information. The assumption is to have display boards in all the bus stops that will display the ETA of the buses in that particular bus stop.

(a)           Create a Solution Design – how will the application achieve the primary objective

(b)          Draw the module view of the application(s) involved in the system, with a one-line description of each module; High light the various HW components needed for the solution to work

(c)           Define the back-end data format and contents, that will enable the displays

(d)          Recommend a cloud-based architecture. Represent it with a diagram (s). Highlight architecture style (s), pattern(s) and relevant tactics

(e)           Highlight specific patterns for high availability and scalability (so that larger corporations can use the solution)

(f)            One of the key success factors for the system is: “the passengers getting the right arrival information about the buses”. Name two quality attributes that will enable this. Justify your answer with detailed explanations.

(g)           With a sequence diagram explain the logic of displaying the arrival information in the Display board kept in the bus shelter

 

Q.2Set.(A)      You have been hired as a consulting architect by a large company XYZ, Ltd. They are in the process of architecting an Enterprise application for internal use. They have asked you to help them to decide between SOA, Container and FAAS – when to use what, by way of scenarios.                                                                                                                  [6]

 

(a)           For each of the above patterns, provide two scenarios, where the pattern will be more useful

(b)          Justify your answer.

 

Q.2Set.(B) You have been hired as a consulting architect by a large company XYZ, Ltd. They are in the process of architecting an Enterprise application for internal use. They have asked you to help them to decide between Microservices, Container and FAAS – when to use what, by way of scenarios.                                                                                          [6]

(a)           For each of the above patterns, provide two scenarios, where the pattern will be more useful

(b)          Justify your answer.

 

Q.2Set.(C) You have been hired as a consulting architect by a large company XYZ, Ltd. They are in the process of architecting an Enterprise application for internal use. They have asked you to help them to decide between SOA, Microservices, Container and FAAS – when to use what, by way of scenarios.                                                                            [6]

(a)           For each of the above patterns, provide two scenarios, where the pattern will be more useful

(b)          Justify your answer

 

Q.3Set.(A)      Create a check list for Mobile App developers on when to use Native vs Web app models. Check list should be in the form of example scenarios                                                         [6]

 

(a)           For each of the above Mobile App Development models, provide three scenarios where the model will be more useful

(b)          Justify your answer

 

Q.3Set.(B) Create a check list for Mobile App developers on when to use Native vs Hybrid models. Check list should be in the form of example scenarios                                                         [6]

 

(a)           For each of the above Mobile App Development models, provide three scenarios where the model will be more useful

(b)          Justify your answer

 

 

 

Q.3Set.(C) Create a check list for Mobile App developers on when to use Hybrid vs Web app models. Check list should be in the form of example scenarios                                                     [6]

 

(a)           For each of the above Mobile App Development models, provide three scenarios where the model will be more useful

(b)          Justify your answer

 

Q.4Set.(A)      Hardware Manufacturers claim that multicore processor improves performance. Software architects use design tactics to improve Software performance.

How do they work together? Use the following format to give the answer.                               [5]

 

(a)           Explain Multi Core

(b)          Name the Software Design tactic(s) enabled / supported by multicore

(c)           How does the multicore enable the implementation of the design tactic(s)?

 

 

Q.4Set.(B) Using private and public key infrastructure,  How can we prevent fake job offers. Make necessary assumptions                                                                                              [5]

 

Q.4Set.(C) One sees the message “Do Not Close This Window (Or Click The Back Button)” especially while doing banking transaction.

What is happening behind the scenes?                                                                    [5]

 

 

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