3.2. Communication and Internet technologies
A subsection of Computer Science, 9608, through 3. Advanced Theory
Listing 10 of 44 questions
Star and bus are two types of topology that can be used in a Local Area Network (LAN). Star topology Bus topology State one benefit and one drawback of the star topology. Benefit Drawback State one benefit and one drawback of the bus topology. Benefit Drawback The sequence of steps 1 to 7 describes what happens when the LAN transmits data from Computer X to Computer Y using circuit switching. Four statements (4 to 7) are missing from the sequence. A Computer X sends the data. B The sender signals node to deallocate resources. C Computer Y sends a receipt signal. D If available, Computer X sets up path between nodes. Write one letter (A to D) in the appropriate space to complete the sequence. Computer X sends a connection request to Computer Y. Computer Y sends ready or busy signal. If busy, Computer X waits and then resends the connection request to Computer Y. …………… …………… …………… …………… Protocols are essential for successful transmission of data over a network. The TCP/IP protocol suite operates on many layers. State the appropriate layer for each protocol in the following table. Protocol Layer TCP IP SMTP Peer-to-peer (P2P) file sharing uses the BitTorrent protocol. Explain how the BitTorrent protocol allows files to be shared.
9608_s18_qp_33
THEORY
2018
Paper 3, Variant 3
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Four descriptions and three protocols are shown below. Draw a line to connect each description to the appropriate protocol. Description Protocol used email client downloads an email from an email server HTTP email is transferred from one email server to another email server POP3 email client sends email to email server SMTP browser sends a request for a web page to a web server Downloading a file can use the client-server model. Alternatively, a file can be downloaded using the BitTorrent protocol. Name the model used. For the BitTorrent protocol, explain the function of each of the following: Tracker Seed Swarm To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cie.org.uk after the live examination series.
9608_s15_qp_31
THEORY
2015
Paper 3, Variant 1
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Four descriptions and three protocols are shown below. Draw a line to connect each description to the appropriate protocol. Description Protocol used email client downloads an email from an email server HTTP email is transferred from one email server to another email server POP3 email client sends email to email server SMTP browser sends a request for a web page to a web server Downloading a file can use the client-server model. Alternatively, a file can be downloaded using the BitTorrent protocol. Name the model used. For the BitTorrent protocol, explain the function of each of the following: Tracker Seed Swarm To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cie.org.uk after the live examination series.
9608_s15_qp_32
THEORY
2015
Paper 3, Variant 2
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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. Packet: Router: TCP/IP: The Internet can be used for video conferencing. Data can be transmitted over the Internet using either packet switching or circuit switching. State two problems that could arise if video conferencing were to use packet switching. Problem 1 Problem 2 Explain what is meant by circuit switching. Explain how the use of circuit switching overcomes the problems you have identified in part .
9608_s17_qp_31
THEORY
2017
Paper 3, Variant 1
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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. Packet: Router: TCP/IP: The Internet can be used for video conferencing. Data can be transmitted over the Internet using either packet switching or circuit switching. State two problems that could arise if video conferencing were to use packet switching. Problem 1 Problem 2 Explain what is meant by circuit switching. Explain how the use of circuit switching overcomes the problems you have identified in part .
9608_s17_qp_33
THEORY
2017
Paper 3, Variant 3
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A Local Area Network (LAN) consists of four computers and one server. The LAN uses a bus topology. Complete the diagram below to show how the computers and the File server could be connected. Computer D File server Computer B Computer A Computer C Computer C sends a data packet to Computer A. Three statements are given below. Tick (✓) to show whether each statement is true or false. Statement True False Computer C uses the IP address of Computer A to indicate that the packet is for Computer A. Computer B can read the packet sent from Computer C to Computer A. The File server routes the packet to Computer A. 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. State the name given to this problem. Give three steps taken by both Computer A and the File server to allow them to transmit their packets successfully. Step 1 Step 2 Step 3 Adding a switch to the LAN changes its topology. Explain how the use of a switch removes the problem identified in part .
9608_s16_qp_31
THEORY
2016
Paper 3, Variant 1
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Questions Discovered
44