Computer Science Standard Level Paper 1 - May 2015

A VPN can be used to securely access a company intranet when working remotely. The VPN encrypts all data transmitted between the user's computer and the company's network, ensuring that sensitive information is protected.

A sub-procedure hides the specific details of how a task is performed, presenting only the overall function and input/output parameters to the user. This allows for simpler code organization and re-use of the sub-procedure in different parts of the program.

<table> <thead> <tr> <th>COUNT</th> <th>N mod COUNT</th> <th>SUM</th> </tr> </thead> <tbody> <tr> <td>1</td> <td>0</td> <td>1</td> </tr> <tr> <td>2</td> <td>0</td> <td>3</td> </tr> <tr> <td>3</td> <td>0</td> <td>6</td> </tr> <tr> <td>Therefore, the output is “perfect”.</td> <td></td> <td></td> </tr> </tbody> </table> Signup and view all the answers

<p>Two usability features for a new laptop could include: (1) A large, high-resolution screen for easier viewing and multitasking, and (2) A responsive keyboard with comfortable typing ergonomics.</p> Signup and view all the answers

<p>One way software developers can ensure users are aware of available updates is by displaying notification popups or messages within the application interface when an update is available for download and installation.</p> Signup and view all the answers

<ol> <li>Collecting the water samples from the four local lakes.</li> <li>Analyzing the water samples in the laboratory.</li> <li>Writing the scientific report based on the analysis results.</li> <li>Developing the animated computer presentation.</li> </ol> Signup and view all the answers

<p>The tasks of collecting water samples and writing the scientific report can be completed concurrently. Students could divide themselves into two groups, one to collect the samples and the other to start writing the report based on previous data or research.</p> Signup and view all the answers

<ol> <li>Start</li> <li>Create three empty lists: list1, list2, and list3.</li> <li>For each customer in the database: <ul> <li>If the customer's next payment date is within the next 30 days, add the customer to list1.</li> <li>If the customer's next payment date is more than 14 days but less than or equal to 30 days past, add the customer to list2.</li> <li>If the customer's next payment date is more than 30 days past, add the customer to list3.</li> </ul> </li> <li>Mark all customers in list 3 for deletion.</li> <li>End</li> </ol> Signup and view all the answers

<p>The lists can be used to filter the database and isolate specific customer groups. The filtered lists can then be exported to a word processor, where a template for each type of message can be created. By using mail merge features, the word processor can automatically populate the templates with the relevant customer data from the lists, creating personalized messages for each group.</p> Signup and view all the answers

<p>Data loss for customers could result in the loss of important personal information, including financial records, contact details, and policy information. This can make it difficult to manage insurance claims, renew policies, or access other important services. For the company, data loss can lead to financial penalties, legal complications, damage to reputation, and loss of customer trust.</p> Signup and view all the answers

<p>One method to prevent data loss is to implement regular data backups. This involves creating copies of the database at regular intervals and storing them in a separate, secure location. In case of data loss, the company can restore the database from the backup, minimizing the impact of the loss.</p> Signup and view all the answers

<p>The OSI model is a conceptual framework that defines seven layers of abstraction in network communication. Each layer performs a specific function, allowing for interoperability between different network devices and protocols. By breaking down communication into distinct layers, the OSI model simplifies the design, implementation, and troubleshooting of network systems.</p> Signup and view all the answers

<p>Protocols define the rules and formats for communication between devices on a network. They ensure that data is transmitted and received correctly, regardless of the specific hardware or software used. For example, the TCP protocol ensures reliable data transfer by breaking data into packets, sequencing them for delivery, and providing error checking and acknowledgments.</p> Signup and view all the answers

<p>An advantage of allowing wireless access to the server is increased mobility and flexibility for users. They can work from anywhere within range of the wireless network, without being tied to a fixed location. However, a disadvantage of wireless access is the potential for security vulnerabilities, as wireless signals can be intercepted more easily than wired connections. This requires implementing strong security measures, such as encryption, to protect sensitive data.</p> Signup and view all the answers

<ol> <li>Iterate through the collection of print job objects, checking the time each job has been waiting.</li> <li>If any job has been waiting for more than 10 minutes, move it to the beginning of the collection.</li> <li>Return the first job in the collection as the next job to be printed.</li> </ol> Signup and view all the answers

<p>Differences:</p> <ul> <li>Bubble sort compares and swaps adjacent elements, moving larger elements to the end of the array in each pass. Selection sort finds the smallest element in the unsorted portion and swaps it with the element at the beginning of the unsorted portion.</li> <li>Bubble sort can be optimized to stop when no swaps occur in a pass, whereas selection sort always iterates through the entire unsorted portion. Similarities:</li> <li>Both bubble sort and selection sort are in-place sorting algorithms, modifying the original array without creating a new one.</li> <li>Both algorithms have a time complexity of O(n^2) in the worst case, making them inefficient for large datasets.</li> </ul> Signup and view all the answers

<p>Selection sort would be more efficient than bubble sort in this case because it only needs to find the 10 smallest elements, not sort the entire array. Selection sort would iterate through the array to find the smallest element, swap it to the beginning, then repeat for the next smallest element, and so on. This is more efficient than bubble sort because bubble sort would repeatedly compare and swap adjacent elements, which would be unnecessary for just finding the 10 fastest times.</p> Signup and view all the answers

<ol> <li>Initialize the array FASTEST[] with a size of 10.</li> <li>For each element in TIMES[]: <ul> <li>If the current element in TIMES[] is smaller than the largest element in FASTEST[]:</li> <li>Find the position of the largest element in FASTEST[]</li> <li>Replace the largest element in FASTEST[] with the current element from TIMES[]</li> </ul> </li> <li>Return the array FASTEST[]</li> </ol> Signup and view all the answers

<p>Using two arrays, TIMES[] and NAMES[], requires separate indexing and retrieval of data. A single index is needed to access the corresponding time and name. Using objects, you can store the time and name as properties within a single object. This allows for a more direct access to the desired data without needing to track separate indices. Data can be accessed by referencing the object and its properties. However, array-based approaches might be more efficient for certain operations. Objects provide more flexible and structured data representation, while arrays may be suitable for simpler data storage and manipulation.</p> Signup and view all the answers