3.2. Communication and Internet technologies
A subsection of Computer Science, 9608, through 3. Advanced Theory
Listing 10 of 44 questions
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_32
THEORY
2016
Paper 3, Variant 2
View
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_33
THEORY
2016
Paper 3, Variant 3
View
A Local Area Network (LAN) consists of four computers, one server and a switch. The LAN uses a star topology. Complete the diagram below to show how to connect the devices. Server Computer A Computer B Computer C Computer D Switch The LAN uses packets to transfer data between devices. Three statements are given below. Tick (✓) to show whether each statement is true or false. Statement True False All packets must be routed via the server. Computer B can read a copy of the packet sent from the Server to Computer A. No collisions are possible. In the same building as this star network, there is another star network. Name the device needed to connect the two networks together. Explain how the device in part decides whether to transfer a packet from one network to the other. 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_w16_qp_32
THEORY
2016
Paper 3, Variant 2
View
A Local Area Network (LAN) consists of three computers, one server and a router connected to the Internet. The LAN uses a bus topology. Complete the following diagram to show how the computers, the server and the router could be connected. Router Internet Computer A Computer B Computer C Server There are four statements in the following table. For each statement, place a tick (3) in the appropriate column to indicate whether it is true or false. Statement True False The server can send packets to Computer B and the router at the same time. Computer C uses the IP address of a web server to send a request for a web page on the web server. Computer B can read a packet sent from Computer A to Computer C. The server can read all incoming packets from the Internet. The user on Computer A and the user on Computer B are both using the Internet at the same time. On a few occasions, Computer A and Computer B start transmitting packets to the router at exactly the same time. This causes a problem called a collision. Explain what is meant by a collision in this context. As a result of the collision, both Computer A and Computer B stop transmitting. Computer A must carry out a number of steps to ensure the successful transmission of its packet. Give two of the steps. Step 1 Step 2 The LAN topology is redesigned. Describe the changes that could be made to the LAN topology to overcome the problem identified in part . Explain how the redesign has overcome the problem.
9608_w17_qp_32
THEORY
2017
Paper 3, Variant 2
View
Bart plays computer games on his stand-alone games console. The games console has an operating system. Describe the tasks performed by the operating system to manage the main memory in the games console. The computer games are written in a high-level language. Bart does not need a compiler or an interpreter to run the games he buys for his console. Explain why the games run without the need for a compiler or an interpreter. When Bart is at work, he connects his work laptop to his employer’s Local Area Network (LAN). The LAN has both a router and a gateway. Give two similarities and one difference between a router and a gateway. Similarity 1 Similarity 2 Difference
9608_s20_qp_11
THEORY
2020
Paper 1, Variant 1
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A Local Area Network (LAN) consists of three computers, one server and a switch. The LAN uses a star topology. Complete the following diagram to show how the computers, the server and the switch could be connected. Switch Computer A Computer B Computer C Server There are four statements in the following table. For each statement, place a tick (✓) in the appropriate column to indicate whether it is true or false. Statement True False The server can send packets to Computer B and Computer C at the same time. The network software on each computer needs to include collision detection and avoidance. Computer B can read a packet sent from the server to Computer C. Computer A can send a packet to Computer B and at the same time the server can be sending a packet to Computer C. The LAN shown in part will be connected to the Internet. A router will be attached to one of the devices on the LAN. State the device used. Give a reason for your choice. Device Reason Explain why a router is required. After the router has been connected, Computer A sends several packets to an internet web server. Explain how the packets are transmitted from the router to the web server.
9608_w17_qp_31
THEORY
2017
Paper 3, Variant 1
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A Local Area Network (LAN) consists of three computers, one server and a switch. The LAN uses a star topology. Complete the following diagram to show how the computers, the server and the switch could be connected. Switch Computer A Computer B Computer C Server There are four statements in the following table. For each statement, place a tick (✓) in the appropriate column to indicate whether it is true or false. Statement True False The server can send packets to Computer B and Computer C at the same time. The network software on each computer needs to include collision detection and avoidance. Computer B can read a packet sent from the server to Computer C. Computer A can send a packet to Computer B and at the same time the server can be sending a packet to Computer C. The LAN shown in part will be connected to the Internet. A router will be attached to one of the devices on the LAN. State the device used. Give a reason for your choice. Device Reason Explain why a router is required. After the router has been connected, Computer A sends several packets to an internet web server. Explain how the packets are transmitted from the router to the web server.
9608_w17_qp_33
THEORY
2017
Paper 3, Variant 3
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Questions Discovered
44