ACSBR 2019 P1 Solution

Prelim Examination 2019 1 Secondary 4 Express Computing 7155/01 PRELIMINARY EXAMINATION 2019 SECONDARY FOUR EXPRESS COMPUTING PAPER 1 7155/01 Marking Scheme Anglo-Chinese S chool (Barker Road)

Anglo-Chinese School (Barker Road) Prelim Examination 2019 2 Secondary 4 Express Computing 7155/01 1 (a) Convert 32 KB into bytes. …………………………………………………………………………………….. [1] (b) Convert 3 MiB into bytes. …………………………………………………………………………………….. [1] 2 Draw a line to match the role to its correct description. Roles arithmetic logic unit • address bus • data bus • control unit • memory • output • Description • Stores data, instructions and the result of processing for immediate use memory • Transports required memory location from processor to memory; uni-directional address bus • Intermediate or final results produced by the computer; usually in the form of processed data output • Part of the processor that processes data by performing basic mathematical and logical operations arithmetic logic unit [4] 3 Insert four of the following phrases in the correct space below. Metropolitan Area Network Internet protocol Router Wide Area Network Service Set Identifiers Network Interface Card (a) ……………………………………………...…. provides the hardware interface to enable the transfer of data between a device and a network. (b) ……………………………………………...….. is a 32-byte string that indicates a wireless access point (WAP) and all devices connected to it. (c) …………………………………………...…….. allows separate networks that use different network protocols to be connected together (d) ……………………………………………...…..: Network of computing devices typically spanning across two or more buildings within the same town or city. [4] 32×10!=32000 3 ×10242 =3 145 728 Network interface card Service Set Identifiers Router Metropolitan Area Network

Prelim Examination 2019 3 Secondary 4 Express Computing 7155/01 4 Your company is setting up a new office and you as the manager of the new office need to decide to install wireless or wired nework. Give one advantage and one disadvantage of a wireless network as compared to a wired network. Advantage……………………………………………………………………..……………… ...........…………………………………………………………………………..……………... ...........…………………………………………………………………………..……………... Disavantage……………………………………………………………………..……………. ...........…………………………………………………………………………..……………... ...........……………………………………………………………………………........... [4] Advantage • For wireless network, mobility of users is higher as users can move about freely within the range of the wireless network. For wired networks, mobility of users is lower as network connections are fixed at specific spots and users cannot move to other locations. • For wireless network, adding new devices to the network is easier as the router can be easily configured. For wired networks, it is more cumbersome to add new devices to the network as physical constraints and the running of cables nee