1 A Local Area Network (LAN) consists of four computers and one server. The LAN uses a bus topology.
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1 1 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. A D File server B C [2] (b) C sends a data packet to A. Three statements are given below. Tick ( ) to show whether each statement is true or false. Statement True False C uses the IP address of A to indicate that the packet is for A. B can read the packet sent from C to A. The File server routes the packet to A. (c) A starts transmitting a packet to C. At exactly the same time, the File server starts transmitting a packet to D. This causes a problem. [3] (i) State the name given to this problem....[1]
2 2 (ii) Give three steps taken by both A and the File server to allow them to transmit their packets successfully. Step 1... Step 2... Step [3] (d) Adding a switch to the LAN changes its topology. Explain how the use of a switch removes the problem identified in part (c)(i)....[4] 3 An is sent from one server to another using packet switching. (a) State two items that are contained in an packet apart from the data [2] (b) Explain the role of routers in sending an from one server to another....[3]
3 (c) Sending an message is an appropriate use of packet switching. Explain why this is the case. 3...[2] (d) Packet switching is not always an appropriate solution. Name an alternative communication method of transferring data in a digital network....[1] (e) Name an application for which the method identified in part (d) is an appropriate solution. Justify your choice. Application... Justification......[3] 3 (a) Explain what is meant by circuit switching....[2]
4 4 (b) There are many applications in which digital data are transferred across a network. Video conferencing is one of these. For this application, circuit switching is preferable to the use of packet switching. Explain why this is so....[6] (c) A web page is transferred from a web server to a home computer using the Internet. Explain how the web page is transferred using packet switching....[3]
5 6 (a) Four descriptions and three protocols are shown below. Draw a line to connect each description to the appropriate protocol. 5 Description Protocol used client downloads an from an server HTTP is transferred from one server to another server POP3 client sends to server SMTP browser sends a request for a web page to a web server (b) Downloading a file can use the client-server model. Alternatively, a file can be downloaded using the BitTorrent protocol. Name the model used....[1] (c) For the BitTorrent protocol, explain the function of each of the following: (i) Tracker......[2] (ii) Seed......[2] (iii) Swarm......[2] [4]
6 2 (a) Complete the diagram to show how the layers of the TCP/IP protocol are related. 6 Choose from the terms: Internet Layer, Presentation Layer, Data Link Layer, Application Layer, Transport Layer. Network Access Layer [3] (b) Give the names of two LAN network technologies that the Network Access Layer has to interface with. Network technology 1: Network technology 2: [2] One layer of the protocol makes use of IP addresses. An IP address is a 32-bit number; for example, is an IP address. Part of the IP address is used for the network ID, and part of the address is used for the host ID. (c) (i) Explain the terms: network ID: host ID: Most IP addresses fall into one of three classes: If the 32-bit address starts with a 0 bit, the address is a Class A address. If the 32-bit address starts with the bits 10, the address is a Class B address. If the 32-bit address starts with bits 110, the address is a Class C address. (ii) Show how to determine whether is a Class A, Class B or Class C address. [2] [2]
7 7 (iii) In a Class A address, the first byte represents the network ID and the remaining three bytes represent the host ID. In a Class B address, the first two bytes represent the network ID and the remaining two bytes represent the host ID. In a Class C address, the first three bytes represent the network ID and the remaining byte represents the host ID. For the address state the: network ID: host ID: [2]
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