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9608_s19_qp_12
A paper of Computer Science, 9608
Questions:
6
Year:
2019
Paper:
1
Variant:
2
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1
Computers on the Internet have IP addresses. IP addresses can be in either IPv4 or IPv6 format. Give an example of a valid IPv4 address. State why there is a need for IPv6 addressing. A computer’s IPv6 address is: C100:2235::1000:25AA:AA50 Explain why this IPv6 address would be an invalid IPv4 address. A company has computers in two separate buildings that communicate using the Internet over a Public Switched Telephone Network (PSTN). Describe the transmission of data using a PSTN. The company wants to install a dedicated line between the two buildings. Identify one benefit and one drawback of installing a dedicated line between the two buildings. Benefit Drawback A network can use routers and gateways. Explain the role of routers and gateways in a network. The company has an email server. Identify three other types of server.
1. Theory Fundamentals  →  1.2. Communication and Internet technologies
Open
2
Biyu is writing a computer program in a high-level language. Biyu uses a language translator. State the purpose of a language translator. Biyu uses an interpreter. State two benefits of Biyu using an interpreter instead of a compiler while writing the program. Name a translator other than an interpreter and a compiler. Biyu uses library files in the program. Explain why software is often developed using library files.
1. Theory Fundamentals  →  1.5. System software
2. Fundamental Problem-solving and Programming Skills  →  2.4. Software development
Open
3
The fetch-execute cycle is shown in register transfer notation. MAR [PC] PC [PC] - 1 MDR [MAR] CIR [MAR] There are three errors in the fetch-execute cycle shown. Identify the line number of each error and give the correction. Line number Correction Line number Correction Line number Correction A processor’s instruction set can be grouped according to their function. For example, one group is the input and output of data. Identify two other groups of instructions. The following table shows assembly language instructions for a processor which has one general purpose register, the Accumulator (ACC), and an Index Register (. Instruction Explanation Op code Operand LDM #n Immediate addressing. Load the denary number n to ACC LDD Direct addressing. Load the contents of the location at the given address to ACC LDX Indexed addressing. Form the address from + the contents of the Index Register. Copy the contents of this calculated address to ACC LDR #n Immediate addressing. Load the denary number n to IX STO Store contents of ACC at the given address ADD Add the contents of the given address to ACC INC Add 1 to the contents of the register (ACC or CMP #n Compare contents of ACC with denary number n JPE Following a compare instruction, jump to if the compare was True JPN Following a compare instruction, jump to if the compare was False JMP Jump to the given address OUT Output to the screen the character whose ASCII value is stored in ACC END Return control to the operating system The current contents of the main memory, Index Register (and selected values from the ASCII character set are: Address Instruction LDM #0 STO 401 LDX 300 CMP #0 JPE 62 ADD 400 OUT LDD 401 INC ACC STO 401 INC IX JMP 52 END … … IX ASCII code table (Selected codes only) ASCII code Character A B C D E The ASCII character code for ‘A’ is 65 in denary. Convert the denary ASCII character code for ‘A’ into 8-bit binary. Convert the denary ASCII character code for ‘A’ into hexadecimal. The Unicode character code for ‘G’ is 0047 in hexadecimal. State, in hexadecimal, the Unicode character code for ‘D’.
1. Theory Fundamentals  →  1.4. Processor fundamentals
Open
4
Shazia is creating a computer program that will be released to the public. The program includes a video. Shazia uses a microphone to record a sound track for the video. Describe the internal operation of a microphone. The script for the sound track is printed using a laser printer. Describe the internal operation of a laser printer. The video is recorded using progressive encoding. Describe progressive encoding. Shazia’s computer has Dynamic RAM (DRAM) and Static RAM (SRAM). Explain the differences between Dynamic RAM and Static RAM. Shazia wants to make sure her computer program is copyrighted. Define the term copyright. Shazia does not want to release the software as open source. Explain why Shazia does not want to use an open source licence. Name and describe two software licences, other than open source that Shazia could use. Licence 1 Licence 2
1. Theory Fundamentals  →  1.7. Ethics and ownership
Open
5
Moheem is creating a relational database to store data about his customers. Moheem has been told a relational database addresses some of the limitations of a file-based approach by reducing data redundancy. State what is meant by the term data redundancy. Explain how a relational database can help to reduce data redundancy. Moheem uses a Database Management System (DBMS) to ensure the security and integrity of the data. Explain the difference between security and integrity. Name and describe two security features provided by a DBMS. Feature 1 Feature 2 The DBMS provides software tools for the database developer. Fill in the names of the missing software tools in the following statements. A allows a developer to extract data from a database. A enables a developer to create user-friendly forms and reports.
1. Theory Fundamentals  →  1.8. Database and data modelling
Open