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OXFORD CAMBRIDGE AND RSA EXAMINATIONS
Advanced GCE
INFORMATION AND COMMUNICATIONS TECHNOLOGY 2515Communications Technology and its Applications
Tuesday 24 JANUARY 2006 Morning 1 hour 30 minutes
No additional materials are required.Candidates answer on the question paper.
TIME 1 hour 30 minutes
INSTRUCTIONS TO CANDIDATES
• Write your name in the space above.
• Write your Centre number and Candidate number in the boxes above.
• Answer all the questions.
• Write your answers, in blue or black ink, in the spaces on the question paper.
• Read each question carefully and make sure you know what you have to do before starting youranswer.
INFORMATION FOR CANDIDATES
• The number of marks is given in brackets [ ] at the end ofeach question or part question.
• The total number of marks for this paper is 90, of which 4marks are allocated to the assessment of the quality ofwritten communication.
• You will be awarded marks for the quality of writtencommunication where an answer requires a piece ofextended writing.
• No marks will be awarded for using brand names ofsoftware packages or hardware.
This question paper consists of 16 printed pages, 3 lined pages and 1 blank page.
(NH) S92537/3© OCR 2006 [T/100/0796] Registered Charity Number: 1066969 [Turn over
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1 (a) A chain of book shops has recently introduced a facility for customers to buy booksusing electronic commerce (e-commerce).
(i) Explain two advantages and one disadvantage of e-commerce for the customer.
Advantages
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(ii) Explain two advantages and one disadvantage of e-commerce for the book shopmanagement.
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(b) Data sent over the Internet may be encrypted.
Explain the purpose of encryption.
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2 A small company based in the UK specialises in the manufacture and sale of hand-madewooden jigsaw puzzles for young children. The office staff use PCs linked through a localarea network (LAN).
(a) Explain the benefits and drawbacks of a star topology for this network.
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(b) Explain the purpose of each of the following network components:
(i) server
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(ii) hub
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(iii) router.
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(c) The company employs sales representatives to market their jigsaws throughout the UK.Each representative is equipped with a cellular (mobile) phone.
Explain how a cellular phone network operates.
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3 International communications often use satellites.
(a) Describe how satellites are used in making and receiving international telephone calls.
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An international manufacturing company has branches and employees throughout the world.
(b) Explain the advantages and disadvantages to the company in using satellites as ameans of voice communication between branches and employees.
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(c) Identify two other uses of satellite communication which may be used by the company.
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4 A national dating agency holds information about its clients on a database. Clients canaccess the database via the agency’s website.
(a) Circuit switching or packet switching could be used to transfer data.
Describe the differences between circuit switching and packet switching.
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(b) Explain why packet switching would be used when a client downloads data from thedatabase.
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(c) Identify concerns that a client might have about their details being held on the datingagency’s database, and describe ways of overcoming these concerns.
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5 (a) Intranets and Information Services are examples of common network environments.
(i) Describe the characteristics and purpose of an intranet.
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(ii) Describe the characteristics and purpose of an information service.
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(b) (i) Explain the importance of bandwidth with respect to the transmission of data.
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(ii) Describe how different types of transmission media determine the bandwidthavailable.
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6 (a) Explain how ICT may be used in making a telephone directory enquiry.
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(b) Chip and pin technology is replacing magnetic stripe technology on credit and debitcards.
Discuss the implications of chip and pin cards for users and for retailers.
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BLANK PAGE
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonablee�ort has been made by the publisher (OCR) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will bepleased to make amends at the earliest possible opportunity.
OCR is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local ExaminationsSyndicate (UCLES), which is itself a department of the University of Cambridge.
