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Past Papers Topical 3.2 Communication & internet technologies
9608/33/M/J/ 2 (a) Four descriptions and three types of local area network (LAN) are shown below. Draw a line to connect each description to the type of LAN it applies to.
(b) A user downloads a file using the FTP protocol. Explain the function played by each of the following: (i) Server ................................................................................................................................ ........................................................................................................................................... .......................................................................................................................................[2] (ii) Command .......................................................................................................................... ........................................................................................................................................... .......................................................................................................................................[2] (iii) Anonymous ....................................................................................................................... ........................................................................................................................................... .......................................................................................................................................[2]
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9608/33/M/J/
Answers
(b) (i) Server: central computer stores files that are to be downloaded (ii) Command: user can send action/instruction (or by example, e.g. change directory) that are carried out on server (iii) Anonymous: allows user to access files user does not need to identify themselves to server
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9608/32/M/J/
Answers
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9608/32/M/J/
1 A Local Area Network (LAN) consists of four computers and one server. The LAN uses a bus topology. (a) Complete the diagram below to show how the computers and the File server could be connected.
(b) Computer C sends a data packet to Computer A. Three statements are given below. Tick (✓) to show whether each statement is true or false.
(c) Computer A starts transmitting a packet to Computer C. At exactly the same time, the File server starts transmitting a packet to Computer D. This causes a problem.
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9608/31/M/J/
5 (a) A web browser is used to request and display a page stored on an internet web server. Explain how each of the following items is used in this event. (i) Packet: .............................................................................................................................. ........................................................................................................................................... ........................................................................................................................................... .......................................................................................................................................[2] (ii) Router: ............................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... .......................................................................................................................................[2]
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(iii) TCP/IP: .............................................................................................................................. ........................................................................................................................................... ........................................................................................................................................... .......................................................................................................................................[2] (b) The Internet can be used for video conferencing. Data can be transmitted over the Internet using either packet switching or circuit switching. (i) State two problems that could arise if video conferencing were to use packet switching. Problem 1 .......................................................................................................................... ........................................................................................................................................... Problem 2 .......................................................................................................................... ........................................................................................................................................[2] (ii) Explain what is meant by circuit switching. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... .......................................................................................................................................[2] (iii) Explain how the use of circuit switching overcomes the problems you have identified
in part (i).
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(b) BitTorrent is a protocol used at the Application layer for the exchange of data. (i) State the network model used with this protocol. .......................................................................................................................................[1]
(ii) State the use of BitTorrent. .......................................................................................................................................[1]
(iii) Explain how the exchange of data is achieved using BitTorrent.
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(c) State two additional protocols that are also used at the Application layer for the exchange of data. For each protocol, give an example of an appropriate exchange of data. Protocol 1 ................................................................................................................................. Example .................................................................................................................................... ............................................................................................................................................ Protocol 2 ................................................................................................................................. Example ............................................................................................................................................ ......................................................................................................................................[4]
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9608/31/M/J/
3 Star and bus are two types of topology that can be used in a Local Area Network (LAN).
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(ii) Peer-to-peer (P2P) file sharing uses the BitTorrent protocol. Explain how the BitTorrent protocol allows files to be shared. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... .......................................................................................................................................[3] 9608/31/M/J/ Answers
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