IT Prelim Paper 2 Memo 2021_hlayiso.com_.pdf

Downloaded from hlayiso.com INFORMATION TECHNOLOGY PAPER 2 GRADE 12 MEMO September 2021 TIME: 3 HOURS MARKS: 150 This memo consists of 6 questions and 11 pages

Downloaded from hlayiso.com Question 1 1.1.1 C The flash drive is 'Read Only’ ✓ (1) 1.1.2 D Copy your own CD to play on your MP3 player. ✓ (1) 1.1.3 D Digital signature ✓ (1) 1.1.4 B Conditional loop ✓ (1) 1.1.5 A A method used by peripherals to gain the CPU’s attention when they need to communicate. ✓ (1) [5] 1.2.1 True ✓ (1) 1.2.2 False Rootkit ✓ (1) 1.2.3 False interpreter ✓ (1) 1.2.4 True ✓ (1) 1.2.5 False Popup ✓ (1) [5] 1.3.1 Firmware ✓ (1) 1.3.2 Green computing ✓ (1) 1.3.3 Microblog/ Tweet ✓ (1) 1.3.4 SEO – Search engine Optimization ✓ (1) 1.3.5 Blog ✓ (1) [5] Total Section A: [15]

Downloaded from hlayiso.com Question 2 2.1.1 Any TWO: CPU, Cache memory, RAM  (2) 2.1.2 Modular design (1) 2.2 The graphics card has its own CPU & RAM that handles the processing of graphics  (2) 2.3.1 RAM is a hardware component that plugs into the motherboard.  OR RAM is an electronic circuit board that fit into a DIMM slot.  (2) 2.3.2 RAM gives applications a place to store and access data on a short-term basis OR Temporary storage of operating instructions (2) 2.3.3 Point to Point connection (1) 2.3.4 Any TWO RAM is expensive The hardware of the system determines the number of RAM chips that can be used/ DIMM slots are limited The operating system determines the amount of RAM that can be used (2) 2.4 • Any TWO ✓✓ • They are much cheaper • Easily available • Can store more data • Can be repaired. (2) 2.5 Any TWO ✓✓ • HDMI • Firewire • Thunderbolt (2) 2.6.1 A program ✓ that gives instructions to the OS on how to communicate✓ with a device. (2)

Downloaded from hlayiso.com 2.6.2 The driver comes standard with the operating system✓ OR No extra drivers need to be installed when plugging the component into the computer. ✓ (1) 2.7.1 When the operating system✓ makes it possible for a program to divide itself into different tasks. ✓Different task is then executed at the same time. (2) 2.7.2 When more than one task is processed✓ by the CPU and it looks like it is done all at the same time.✓ The CPU splits time between tasks. (2) 2.8.1 Software that users can use primarily through the internet ✓, at least some of it is managed by a server and not the users' local machines. (1) 2.8.2 Any TWO ✓✓ • You have access to the latest software as long as you pay subscription. • Scalability • As long as you have internet connection you have access to the software from any device. • Working together made easy. • Outsourcing services. • The service provider is responsible for upgrading software and hardware. (2) 2.8.3 Highlight the differences: Cloud backup – a duplicate of the hard disk exists – backup / incremented backup is scheduled according to settings in the backup software✓ Synchronisation – the user decides which files should be uploaded from the computer. This process is automated when the user logs on to the service✓ (2) Total Section B [28]

Downloaded from hlayiso.com Question 3 3.1.1 Collection of computers/computing devices ✓ that are connected by some sort of communication media ✓ to allow users to share hardware, software, data, and information and to communicate. (2) 3.1.2 Router: a hardware device that makes communication between networks possible over the Internet by directing data to its correct destination ✓. Switch: a hardware device used to connect computers on a network so that communication can occur ✓. (2) 3.2.1 Star topology ✓ (1) 3.2.2 Any ONE: ✓ • Easy to install • Easy to bend • High bandwidth over short distances (1) 3.2.3 The NIC allows computers to communicate over a computer network ✓, either by using cables or wirelessly. The NIC translate the signal used by the communication media to a signal used by the device. (1) 3.3.1 Any TWO: ✓✓ • The URL must begin with HTTPS. • There should be a padlock symbol somewhere in the browser’s toolbar. (2) • Some browsers change to a green bar. 3.3.2 SSL is an encryption protocol which encodes and decodes data ✓ that is sent over the Internet using private and public keys. ✓ (2) 3.3.3 Phishing: you receive an email from pretentious people or institutions such as your bank prompting you to urgently give out your personal information as if they are checking it✓. Pharming: you do not receive an email. The user’s computer is infiltrated so that they are automatically redirected to another (fake) website even if they type in the correct URL for the website✓. (2) 3.4.1 Any TWO: ✓ ✓ • Creates, deletes, manages user accounts. • Updates software. (2) • Administer network security.

Downloaded from hlayiso.com 3.4.2 Administrator: have full control over the system. They can create and modify new user accounts and groups and they can reset passwords. They have full access to all the files and folders✓. Standard user: are permitted to log onto the computer, run programs, customize their accounts, and work with files in their user folders or common folders to which they have granted access. Standard users are restricted from making system changes✓. (2) 3.5.1 IP address stands for internet protocol address; it is an identifying number that is associated with a specific computer or computer network ✓ (1) 3.5.2 It is a network address for the computer so that data, email etc. can be delivered to the correct address/computer. ✓ (1) 3.6.1 The connection can become slow because of too many users connected to the Wi-Fi. ✓ (1) 3.6.2 Any TWO: ✓✓ • Personal information: Information in the password can easily be hacked because personal information is used to create the password • Length: Password should be at least 8 characters or more • Combination of characters: Upper- and lower-case letters and special characters must be included. • Change regularly: The password has a set pattern and can not be changed. (2) Total Section C: [22] DATA AND INFORMATION MANAGEMENT QUESTION 4 4.1 The primary key refers to a field/combination a field ✓ that identifies a record uniquely✓. (2) 4.2 Contains unique data of another table/entity✓ / Links with primary key of another table (1) 4.3.1 Physical data integrity deals with the physical ✓ storage and retrieval of data✓. (2) Any TWO: ✓✓ 4.3.2 • Power failure • Mechanical failure • Natural disaster (2)

Downloaded from hlayiso.com 4.3.3. Any TWO: ✓✓ • UPS • RAID • Locking up in safe areas • Biometric access or passwords (2) 4.4.1 Data validation use programming techniques to ensure that data meets a specific set of requirements✓ Data verification is checking/verifying from a human’s perspective that the data is correct✓ (2) 4.4.2 The data you enter into the computer will be used to generate output even if it is incorrect. Your output may be meaningless if the input is incorrect ✓ (1) 4.5.1 An audit trail is a record that is kept, to keep track of who ✓ made changes to the database and when ✓ they made those changes. (2) 4.5.2 Any TWO: ✓✓ • Extra costs • Chances of fraud • Personal information is captured during audit trail • Confidentiality not guaranteed (2) 4.6.1 Auto number or text ✓ (1) 4.6.2 Date/time✓ (1) 4.7.1 It will be difficult to sort the data according to the surname✓ because the initials and surname is combined in one field. ✓ (2) 4.7.2 Normalisation prevents composite/combined fields. ✓ The initials and surname should be split into two separate fields. (1) 4.8 Data mining - Software is used to identify trends/patterns ✓ in the vast amount of data ✓ (2) 4.9 A hacker types a SQL statement ✓ in a data field/query parameter instead of the required data. ✓ (2) Total Section D: [25]

Downloaded from hlayiso.com SOLUTION DEVELOPMENT QUESTION 5 5.1 Any TWO: ✓✓ • Private attribute is protected against changes from other users. • No access to private attribute from other classes/units. • Public methods can be called and used by other classes/units. (2) 5.2 procedure ✓ SETFullTime( bFullTime: Boolean); ✓ (2) 5.3 procedure DetermineGender; ✓ (no parameters) ✓ OR Function DetermineGender : char; (2) 5.4.1 The toString() method returns the string representation ✓of the fields of the object ✓ OR Combine the fields of the object ✓as a string value✓ to use as output. (2) 5.5.1 The compiler tried to convert the input value to a number value✓, but the brackets/spaces are text✓ Accept an answer that indicates that text /string clashes. (2) Any TWO: ✓✓ 5.5.2 • The message must clearly indicate the mistake • The message must indicate how the mistake can be solved (2) • The message must be friendly/polite/respectful 5.6 Array – a data structure that contains a group of variables containing values of the same data type✓ Index – an ordinal value indicating the position of the element in the array✓ (2) 5.7.1 Unconditional loop ✓ The number of months is known/only 12 months. ✓ (2) 5.7.2 The data types are different. ✓A 2-dimensional array can contain only 1 data type (1)

Downloaded from hlayiso.com 5.8 Read a 5-digit number in Answer 0 ✓ Value  5 Loop from 1 to 5✓ number  digit[loopcounter] multiplied by value ✓ answer  answer ✓ + number✓ value  value – 1 ✓ control digit  answer modulus 5✓ Permit number  5-digit number + control digit ✓ Display permit number (8) Total Section E: [25] Question 6 6.1.1 • Phone numbers ✓ • Address✓ • E-mail address✓ (3) 6.1.2 Identity theft – where someone obtains your personal information ✓ to assume your identity (pretends to be you) ✓ (2) 6.1.3 Any TWO: ✓✓ • Don't give out personal information • Install anti-spyware software • Keep documents that contain your personal information in a safe place • Only enter your personal information on reputable/safe websites (2) 6.1.4. A social engineer is a con artist who pretends to be what they are not✓ to benefit themselves (to gain access to information, money, etc.) ✓ (2) 6.1.5 Spyware ✓ Keylogger ✓ (2) 6.1.6 a) Cyber-bullying – when someone's reputation or integrity is attacked or undermined using an electronic communication medium.✓ (1)

Downloaded from hlayiso.com b) Any ONE: ✓ • Posting derogatory comments or photos about someone on a social networking site • Spreading rumours about a person via IM or chat room (1) 6.2.1 Web based email: access your email account through a web browser from any location that has Internet access✓. ISP-based email: You receive an email address when you sign up with an ISP✓. You access your email by using software such as Microsoft Outlook and Outlook Express on the computer where your account settings have been entered. (2) 6.2.2 Bcc: ✓ it is professional to use Bcc as not everyone needs to see all the email addresses the email is sent to. ✓ (2) 6.3 Any THREE: ✓✓✓ • Mobile apps aid promotion for businesses through push notifications • It’s easy to treat users with a personalized experience • Unlock the power of better connection with customers as online interaction is safer. • Driving high engagement levels as it is cost effective to reach their customers. (3) 6.4 A virtual office has a physical adress ✓ with reception and rooms for meetings. It is shared space for people that normally use mobile offices. ✓ (2) 6.5 Through the IP address ✓ (1) 6.6.1 Any TWO: ✓✓ • Effective utilization of assets, like stock control. • Acquiring sensor driven insights, e.g., climate control • Enhanced customer service, keep track of number of people using the app • Cost-effectiveness. Can advertise using location based apps. • IoT helps in machine learning. • Understanding your business requirements. (2) • System design and development 6.6.2 Any ONE: ✓ • A “smart” diaper embedded with a moisture sensor that can alert a caregiver when a diaper is wet. • Smart diapers may help record and identify certain health problems, such as signs of constipation or incontinence. (1)

Downloaded from hlayiso.com 6.7.1 Virtual reality (VR) immerses people in experiences, often with a lot of expensive technology such as headsets. ✓ The whole experience is imaginary. Augmented reality, on the other hand, usually starts with a real-life image of something (such as the camera of a mobile phone), and add virtual images to the screen or viewer. ✓ Examples: Try out a pair of frames after your eye test. Use a photo of a girl and do a virtual make-up session. Pick out paint by trying out different colors on the room walls by combining a photo of the room with virtual colors provided by an app. (2) 6.7.2 VR software take up a lot of space and requires a lot of computing power compared to other devices. ✓ (1) 6.8.1 Encryption functions through algorithms that convert data into unique, complex codes that are nearly impossible for even supercomputers to crack. ✓ If the receiver doen’t have the decryption key the transaction wont go through. ✓ (2) 6.8.2 Any TWO: ✓✓ • Bitcoins are still only accepted by a very small group of online merchants. • If a hard drive crashes, or a virus corrupts data, and the wallet file is corrupted, Bitcoins have essentially been “lost” • When goods are bought using Bitcoins, and the seller doesn’t send the promised goods, nothing can be done to reverse the transaction. • Since there is no central authority governing Bitcoins, no one can guarantee its minimum valuation. (2) 6.9.1 Any TWO: ✓✓ • The risk of malware. • The P2P file sharing method raises a risk of unauthorised access to organisation’s critical business information. • Once you go online, or once you download torrents, you become vulnerable to hack attacks. • Torrent files are known to contain copyrighted material (2) Total Section F: [35] Grand Total: [150]