IT computer science

Anonymous
timer Asked: Feb 28th, 2018
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Question Description

Read the attached instruction before a answering the question

Question 1 (30 marks)

This question allows you to demonstrate your ability to carry out calculations such as those introduced in Block 3 Parts 1 and 2 and the Using Numbers (maths) booklet.

In each case you should demonstrate how you worked out your answer, as well as giving the answer. You must show your working to gain full marks. In each case about half of the marks awarded are for a clear explanation of your working.

  • a.You saw in Part 1 of Block 3 that frequency is the number of cycles per second and period is the duration of a cycle.
    • i.If a sine wave completes one cycle in 5µs, how many cycles are completed in 1 second?
    • ii.Give your answer in scientific notation.
    (5 marks)
  • b.Convert the following hexadecimal MAC address to binary form (as shown in the ‘Using Numbers (maths)’ booklet): AB-34-E5-F0-28-CA (9 marks)
  • c.Convert the following binary IP address to dotted decimal form (as shown in Block 3 Part 2): 00001010.01100011.01011000.01001101(8 marks)
  • d.How many possible host addresses are available for:
    • i.an IPv6 address?
    • ii.an IPv4 address where the first octet is reserved for network addresses? Express your final answer in scientific notation to four significant figures.
    (8 marks)
  • Question 2 (30 marks)

    • a.
      • i. Explain how an ad hoc wireless area network differs from an infrastructure wireless area network. The maximum word limit for Question 2a (i) is 75 words.(5 marks)
      • ii. What characteristics of ad hoc networks in general, and Zigbee specifically, make this sort of network especially suitable for home automation, particularly where some devices on the network might be battery powered? The maximum word limit for Question 2a (ii) is 100 words.(5 marks)
    • b.
      • i. At 100m from the antenna of a cellular base station in open country, measurements show that the power per square metre is 400µW/m2. What power per square metre could be expected at 200m from the base station? Show your working and explain any assumptions you make. (5 marks)
      • ii .A base station is located in an urban environment, and the power per square metre at 100m is measured to be 4µW/m2. What would be a reasonable value to expect at 200m? (You will have to make an assumption to calculate your answer. State the assumption you make.) (5 marks)
      • iii. In parts (i) and (ii) of this question you looked at signal attenuation caused by increasing distance from a base station, and also by environmental factors. Briefly explain the problem that signal attenuation leads to in digital communications and the techniques that can be used to remedy the effects of signal attenuation. Then give a concise outline of how signal attenuation is put to beneficial use in cellular communications. The maximum word limit for Question 2b (iii) is 200 words. (10 marks)
  • Question 3 (30 marks)

    • a.
      • i. In Block 3 Part 5 Activity 5.12 you found a web resource and added a page section about it to a wiki. Now that you have studied Part 6 of Block 3, find a web resource that you think is interesting and relevant specifically to Part 6. Add a page section about this resource to the TM111 TMA03 tutor group wiki. In your wiki section you should include a link to your chosen resource, explain what it is about and how it is relevant to Part 6. You should write no more than 150 words.As your answer to this part of Question 3: - paste into your TMA document a copy of the text in your wiki section - make a screenshot showing your wiki section and paste it into your TMA document.(6 marks)
      • ii. Choose a section in the wiki which you find interesting, contributed by another student. Using the wiki’s ‘Edit section’ facility, add a comment to the wiki section you chose, explaining why it is of interest to you. You should write no more than 100 words. Precede your comment with ‘A comment from [your name]’ so that your tutor and other students can tell who the comment is from. As your answer to this part of Question 3: - paste into your TMA document a copy of your comment - make a screenshot showing your comment in the wiki section and paste it into your TMA document.(3 marks)
      • iii. Thinking back to your work in OpenStudio in Block 1, write a short piece of text comparing your experience of using the wiki with your experience of OpenStudio. Which did you prefer for this type of activity (i.e. adding web resources and making comments on them) and why? Relate your answer to two of the following concepts that you learnt about in Block 1 Part 6.5.1, ‘What is usability?’:- effectiveness - efficiency - satisfaction - learnability - recoverability The maximum word limit for Question 2a (iii) is 250 words.(6 marks)
    • b. In this part of Question 3 you will be working with the following extract from an opinion piece in the Times newspaper by the controversial journalist Matt Ridley (note that ‘ad hom’ is short for ‘ad hominem’; you may need to use a dictionary or search the web to see what this means).

    If we don’t tame Twitter, we’ll face mob rule - In the 1930s radio was the tool of dictators and propagandists. Now social media is fuelling abuse and driving us apart

    […] Social media is polarising our discourse more painfully than before. It amplifies the personal and the extreme, hots up the echo chamber and gives wings to lies. Confirmation bias rules, preaching to the converted dominates, nuance vanishes and moderates stay silent.I am a bit of a technological determinist about this. I think communications technologies can decide the political temperature. After decades in which they generally helped moderate discourse, outside autocracies, they are now inflaming it. When blogging was all the rage a decade ago, at least there was space for nuance. Now, opinions are boiled down to a single shout.I use Twitter mainly to find and pass on links to articles and reports on topics that interest me. To do so, though, I have to wade through bitter feuds, walk past vicious ad-homs, jump over blatant embellishments and bump into absurd hyperbole. “I can’t even remember what it is like to go to bed not feeling homicidal with rage,” read one tweet on Friday, not from a Black Lives Matter activist or a relative of a Dallas policeman, nor from an Islamist or the relative of a victim of Islamist bombing, but from a distinguished journalist upset about Brexit.I am not the first to make this point. A Pew Research Centre project in America found that “Polarised crowds on Twitter are not arguing. They are ignoring one another while pointing to different web resources and using different hashtags.” A group of Italian academics published a paper last year finding that “selective exposure to content ... generates the formation of homogeneous clusters, ie, ‘echo chambers’” […]
    (Source: Ridley, 2016)
    Matt Ridley says ‘I am a bit of a technological determinist about this’.
    • i.Based on your study of Block 3 Part 6, explain in your own words what is meant by ‘technological determinism’. What does Ridley say in the extract above that supports the idea that he is ‘a bit of a technological determinist’? (5 marks)
    • ii.Why are explanations based on technological determinism sometimes misleading? Illustrate your answer by presenting counter arguments to those of Ridley about social media. (5 marks)
    • iii.In Block 3 Part 5 you learned about the idea of the ‘filter bubble effect’. Explain in your own words what this means and how it relates to the ideas in first paragraph of the extract above. The maximum word limit for Question 3(b) is 300 words.(5 marks)
  • Question 4 (10 marks)

    What you should have already completedYou should have completed your PDP action plan form as part of Activity 6.21 in Block 1 Part 6, and submitted it in TMA02. You will find it helpful to revisit Steps 4 and 5 of Section 6.6.3 Reviewing your goals and action plan before answering this question.Answering this questionYour tasks here are to:
    • review and reflect on your progress in relation to the PDP action plan you submitted as part of TMA02
    • comment briefly on the knowledge and skills you have gained as a result of your studies
    • assess your progress towards your goals, and/or state clearly why/how they have changed.
    You should use the PDP action plan review template for this purpose, and you should then make an updated version of your PDP action plan form.Your commentary must include the goal(s) relating to improving your learning or study skills while studying TM111. You should submit both the PDP action plan review template and your updated PDP action plan form as your answer to this question.
  • References

    Ridley, M. (2016) ‘If we don’t tame Twitter, we’ll face mob rule’, The Times, 11 July, p. 17.

Assessment guide The purpose of this guide At some point in your life you will have been tested or assessed. You probably took examinations at school, had a driving test or have been assessed to make sure that you can do your job competently. Many people have poor experiences of tests or examinations from their earlier education and this can make them anxious about submitting a piece of work which is going to be assessed. You will certainly not be alone if you experience this feeling, and the purpose of this guide is to help you overcome any apprehension you may have about assessment at The Open University. This guide will explain the different types of assessment you are likely to encounter as you progress through your studies. It will help you to make the most of the assessments, so that you can demonstrate what you have learned. The other important document is the Assessment Handbook, which can be accessed online from your StudentHome page and the ‘Assessment’ page on your module website. The Assessment Handbook details University assessment policy and procedures, and you will need to refer to it from time-to-time, so it would be a good idea to bookmark this resource. This guide sets out the principles that apply to assessment on TM111 Introduction to computing and information technology 1. Types of assessment There are two types of assessment at the Open University: formative assessment and summative assessment. Both types are important for learning. Formative assessment Formative assessment is designed to help you consolidate your knowledge, understanding and skills and to help you reflect on your progress. It does not contribute towards your final grade on your module or qualification, so it would be easy to think that because of this it can be ignored. However, completing the formative assessments is essential to your development as a learner and will assist you in the assessments which do count towards your final grade. Formative assessment exists in many forms in the module materials, such as exploratory activities, selfassessment activities, programming exercises and quizzes. These may be found in both the printed and the online materials. You are encouraged to send a practice assignment, TMA 00, using the eTMA system at the start of the module. Summative assessment In contrast, summative assessment does contribute to the overall grade for your module. Just like formative assessment, summative assessment can take several forms. TM111 uses continuous assessment. There is no examination or end-of-module assessment. There are two forms of continuous assessment: •tutor-marked assignments (TMAs) •interactive computer-marked assignments (iCMAs). Typically, continuous assessment is used to assess your understanding of the most recently studied section of a module. There are three TMAs and three iCMAs for you to complete. The marks for all these assignments count towards your final grade for this module. Answering interactive computer-marked assignments As their name suggests, iCMAs are marked by a computer. These are usually short questions. You submit your answers via the module website. Usually, you are allowed more than one attempt in iCMA questions for TM111. It is important to remember to click the ‘submit’ button in order for the iCMA to be marked. Your overall mark will become available shortly after the submission date. You will find further information about iCMAs in the Computing Guide. Your first iCMA occurs in Week 3 of the module, so this will give you an opportunity to check your progress at an early stage of the module and you should gain some marks towards your final score at the end of the module. Answering tutor-marked assignments This section looks at how to tackle different types of TMA on TM111. For this module, the TMAs generally consist of short pieces of written work; practical work, such as producing a website and programming; and, later in the module, some numerical calculations. This may sound rather daunting, but the assessment is designed to build up your skills gradually, enable you to get feedback from your tutor, and help you gain confidence in your work. Writing answers It may sound obvious, but the first thing to do when attempting a TMA is to read the questions thoroughly. Read the questions several times and make sure you understand what each question is asking you to do. If you are unsure about something, do contact your tutor, who will be able to help you – but without giving you the answer, of course. Do not include extra material such as the question text or journal articles in your answer unless specifically asked. Academic English You will need to complete your TMAs in relatively formal English and use grammatically correct language. You should avoid the following: • • • slang or informal language – such as ‘kids’ instead of ‘children’ offensive language or swearing text-speak – such as ‘u’ instead of ‘you’. If you have any doubt about your ability to write in academic English, you may find it helpful to work through The Open University’s online resource Developing academic English (this is part of 'Core skills' in the 'Study skills' section of the Help Centre at StudentHome. There are links to other skills materials on the ‘Resources’ page on your module website. You will also be helped to develop your writing skills as you progress through your studies. Spelling The final version of your work should be spell-checked. It’s a good idea to ensure that your wordprocessing software is set up to check spelling in UK English, rather than US English. Word counts and marks You will sometimes find that TMAs have suggestions for the number of words to use when answering a particular question. These word counts are provided as a guideline for the expected length of your answer and are designed to help you. If you write far fewer words than suggested, you may be missing important points from your answer; if you write many more, you are likely to be including irrelevant information. In each of the above situations, you may risk losing marks. TMA questions will always state the maximum marks that could be awarded for the question and its parts. Use this information about marks as a guide to how much to write. For example, if part of a TMA question is worth only two marks, you will not be expected to write a whole page of content or draw a detailed diagram. However, if part of a question is worth 10 marks, then a more detailed answer will be expected. Numerical answers It is important when writing answers to numerical questions that you present your work in a logical way and that you state very clearly the steps in your calculations. Simply writing down a few numbers and an answer does not demonstrate to your tutor that you understand the method used in a particular calculation. It also makes it very difficult for your tutor to correct errors if they cannot see clearly what steps you have taken to arrive at your answer. Use one line for each stage of the calculation and include brackets and equals signs to make your meaning clear. There are many examples in the module materials, and you can find more help in the Using numbers booklet. Before you submit a TMA When preparing your assignment, you should take care in the construction, layout and clarity of your answers. This will aid your tutor, but more importantly it should help you to formulate a better answer. Some specific guidelines are as follows: • • • • your answers should have a clear structure, with separate section headings where appropriate your answers should be written in a clear and concise style if a question requires a numerical answer, all the steps in your mathematical reasoning should be written out clearly and logically so that your tutor can follow your line of thought your answers must be legible. All TMAs for TM111 Introduction to computing and information technology 1 must be submitted electronically via the University’s online TMA/EMA service, and detailed instructions on how to submit are given at StudentHome. Once your TMA has been marked, you will be able to collect it from StudentHome and see the feedback and mark given by your tutor. Using the feedback from your tutor Your tutor will mark your TMAs to assess your progress and how well you are learning from the module material. Your tutor will provide detailed comments and advice on your assignment. They will also comment on how well you have communicated and presented your ideas. You will receive a cover page your marks and a summary of the strengths and weaknesses of your assignment. Feedback from your tutor will guide you for future assignments and address any misunderstandings so they aren't repeated in other assignments. Think about what your tutor has said and then bear these points in mind when you come to complete your next assignment. It is worthwhile reading over your tutor’s comments on your last TMA immediately before you tackle the next one. If you are disappointed in your overall grade, try not to be discouraged. Leave it for a couple of days, then reread your assignment and your tutor’s comments. Remember that making mistakes is part of learning. It may not feel like it at the time, but the feedback we get from making mistakes is a powerful learning experience in itself. What to submit for TMAs Most of your work for your TMAs will be submitted in a word-processor document. However, you will be asked to include other types of files for some TMA answers – for example screenshots, audio files and OUBuild programs. File formats for assignments Your written answers to each TM111 assignment should be sent in a single, word-processed document. Do not submit answers to each question in separate documents because it makes them harder to mark. The University requires you to submit in a file format that is compatible with Microsoft Word. This means a file with a file extension of .doc, .docx or .rtf. If you use OpenOffice or LibreOffice, you need to use ‘Save As’ and choose Word 97/2000/XP (.doc) or Word 2007/2010 XML (.docx) as the file type. Similarly, any spreadsheet documents you submit must be in Microsoft Excel’s .xls or .xlsx format. You will find further information on document formats in the Help Centre. Audacity files In Block 1 you will be using Audacity, the sound editor application, as part of your study. You may be asked to embed an Audacity audio file in your TMA document. Alternatively, you can compress (zip) the Audacity file with your other TMA files. OUBuild In Block 2 you will be using OUBuild, the programming environment. You will be asked to submit program files for OUBuild as part of TMA 02. These files should be in .sb2 format. The .sb2 format is how your projects will be automatically saved by OUBuild. Taking screenshots You will be asked to take screenshots showing your work, and paste them in your TMA document. You should include only the item or section of the screen that you are asked for, therefore crop or resize the image as necessary. The screenshot must be clear enough for your tutor to assess your work. Instructions for taking screenshots in both Windows and MacOS are in the sidebar. You will find further information on taking screenshots in the Computing Guide. Windows Make sure your screen contains the item you want and that the window is active (click on the window to make sure). Press the PrintScreen key on your keyboard (or PrtScn on some keyboards). On most keyboards, this is found to the right of the 'F12' key. In more recent versions of Windows there is a more sophisticated screenshot-taking program called 'Snipping Tool'. You can start the program in two ways: • • click on the icon if it is already pinned to your taskbar either select the Windows Start button or press the Windows key, and type ‘Snipping’ into the Search bar. Select Snipping Tool. Use Snipping Tool to either take a screenshot of the whole screen or part of it (like snipping a piece of a page out of a magazine). Press and hold the triangle next to the New button to select one of the snip types. • Full-screen Snip Capture your entire screen – essentially the same as using PrtScn. • Free-form Snip Click and move your mouse cursor to capture within a free-form shape. • Rectangular Snip Drag your mouse cursor to capture a rectangular shape. • Window Snip Select an open window (for example your web browser) to capture just the window MacOS These are three options for creating a screenshot in MacOS: • • • use Preview open the Preview application go to the File menu and then select Take Screenshot. You have three options to choose from: • • • Selection Window Entire Screen. If you prefer, you can use keyboard shortcuts to take the screenshots and rather than 'Preview'. Use the keyboard shortcuts: • • • • • • Cmd + Shift + 3: lets you take a screenshot of the entire desktop Cmd + Shift + 4: lets you select an area of the screen to capture Cmd + Shift + 4, space bar: lets you capture a window Cmd + Control + Shift + 3: lets you take a screenshot of the entire screen and save it to your clipboard to be pasted in elsewhere Cmd + Control + Shift + 4: lets you can take a screenshot of an area of the screen and save it to the clipboard Cmd + Control + Shift + 4, space bar: lets you take a screenshot of a window and save it to the clipboard. You will find your screenshot saved as a PNG file on your desktop. Use Grab You will find Grab in the Utilities folder in Applications. In the Capture menu, you can choose to capture a: • • • • selection window screen or even a timed screen. You may then save the screenshot or copy it and paste it directly into your word-processor document. Your screenshots will automatically open in 'Preview', where they can be edited and saved. To edit your screenshot you will need the Markup Toolbar in Preview, View > Show Markup Toolbar. Compressing files You will need to submit more than one file for your answer to some TMAs (for example a .doc file and some .sb2 files). As the TMA system will accept only a single file, the files must be put into one folder and compressed together into a single .zip file. You must use .zip for your compressed file format. If you are using WinZip, you must select the ‘legacy’ zip format and not use its new .zipx format. Other formats, such as .rar should not be used. There is further information on zipping files in the Help Centre. There are several pages in the Computing Guide. to explain more about zip files. Plagiarism Assessments should be completed using the materials provided as part of the module, together with other sources of information as directed throughout the module. You may also choose to look other sources of information (for example reference books or the internet) for additional relevant information when completing an assessment. Very short extracts from published sources may be included in context, but you should avoid copying significant amounts of text. You should note that while the internet can provide lots of information, much of it is not reviewed by experts and should be treated with caution. If you take material from the module or elsewhere and incorporate it in your answer word-for-word, you must indicate where you have taken it from. Not to do so is termed ‘plagiarism’ and is regarded as an infringement of copyright. To attempt to pass off such work as your own is cheating. You must therefore acknowledge all your sources of information. For more information about what constitutes plagiarism or cheating, you should refer to the current Assessment Handbook. For study skills, support on writing in your own words and appropriate referencing, try the Study skills website and/or ask your tutor. (The Study skills website can also be accessed at StudentHome and the ‘Resources’ page on the module website.) You should be aware that submitted assignments are examined using a range of plagiarism detection software.

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anamae12
School: Duke University

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