0478_w20_qp_11
A paper of Computer Science, 0478
Questions:
9
Year:
2020
Paper:
1
Variant:
1
Login to start this paper & get access to powerful tools
2
Ron is attending a music concert. He has bought three tickets. Each ticket number is displayed as a hexadecimal number. Complete the table to show the 12-bit binary values and the Denary values for each Hexadecimal ticket number. Hexadecimal ticket number 12-bit binary value Denary value 1A9 20C Working space Each ticket also has a QR code. The QR code is scanned at the entrance to the venue. A person can only enter the venue with a valid QR code that allows entry. When a person enters, a count is incremented to show how many people have entered the venue. Explain how the system scans the QR code, checks if a person can enter and counts how many people have entered.
1. Data representation  →  1.1. Number systems
Open
3
Transport Layer Security (TLS) protocol is used to secure the transmission of data over the Internet. Identify the two layers in the TLS protocol. Layer 1 Layer 2 The following paragraph explains how data is sent securely using the TLS protocol. Use the terms to complete the paragraph. Not all terms may need to be used. • authentic • binary • browser • certificate • internet service provider • signal • web page • web server • website The browser requests the to identify itself by providing its . This is sent and a check is performed to see if it is . If it is, the sends a back to the web server and data transmission begins. Identify one other protocol that can be used to secure data transmission over the Internet.
5. The internet and its uses  →  5.1. The internet and the world wide web
2. Data transmission  →  2.1. Types and methods of data transmission
Open
4
Consider the given logic statement: X = ((NOT (A NAND B)) OR (B NOR C)) Draw a logic circuit to represent the given logic statement. All logic gates must have a maximum of two inputs. Do not attempt to simplify the logic statement. A B X C Complete the truth table for the given logic statement. A B C Working space X The logic statement given has four different logic gates. Identify two other logic gates and complete a truth table for each. Logic gate Truth table A B X Logic gate Truth table A B X
10. Boolean logic  →  10. Boolean logic
Open
5
Luke is creating a website for his t-shirt design business. He is using HTML to create the website. HTML can be separated into structure and presentation. Give two examples of HTML structure. Example 1 Example 2 Give two examples of HTML presentation. Example 1 Example 2 Luke is concerned that his web server may be hacked or subjected to a denial of service (DoS) attack. State two security methods that Luke could use to help protect the web server from hacking or a DoS attack. Method 1 Method 2
5. The internet and its uses  →  5.1. The internet and the world wide web
5. The internet and its uses  →  5.3. Cyber security
Open
6
A Von Neumann model for a computer system contains several integrated circuits (IC). Parallel data transmission is used in an IC. Describe how data is transmitted using parallel data transmission. Give one benefit of using parallel, rather than serial, data transmission. The computer has a central processing unit (CPU). Identify the bus that carries signals around the CPU to control the components. Identify the register built into the arithmetic logic unit (ALU). Four statements about a Von Neumann model for a computer system are shown. Tick (3) to show if each statement is True or False. Statement True (3) False (3) Data and instructions are stored in the same memory unit The control unit manages operations within the CPU Data and instructions can be fetched into the CPU at the same time The control unit is responsible for decoding an instruction
3. Hardware  →  3.1. Computer architecture
Open
9
Victoria is entering data into a computer system. The data will be transmitted to cloud storage. An even parity check is used to check for errors in the binary values after transmission. For each of the 7-bit binary values, write the Parity bit that makes sure even parity is met. 7-bit binary value Parity bit Identify two other error checking methods that could be used to check the binary values are correct after transmission. Method 1 Method 2 A check digit is used to check whether data is correct when entered into the system. Describe how a check digit can be used to make sure the data entered is correct.
2. Data transmission  →  2.2. Methods of error detection
Open