10 free sample questions with answers and explanations. See how you'd score on the real DSST exam.
A company decides to implement encryption for their sensitive data transmission. Which encryption method would provide both authenticity and confidentiality?
Explanation
Asymmetric encryption, also known as public-key encryption, uses a pair of keys: a public key for encryption and a private key for decryption. This method provides both confidentiality, as only the private key can decrypt the data, and authenticity, as the public key can verify the sender's identity through digital signatures. Symmetric encryption (A) provides confidentiality but requires a shared secret key, which may not be suitable for authentication. Option B is incorrect because asymmetric encryption can provide both confidentiality and authenticity. Hashing (C) provides data integrity but not confidentiality or authenticity in this context.
A company's network is infected with a type of malware that encrypts files and demands payment in exchange for the decryption key. What type of malware is this?
Explanation
This is an example of ransomware, a type of malware that encrypts files and demands payment in exchange for the decryption key. Ransomware is a growing concern for individuals and organizations, as it can cause significant disruption and financial loss. The correct answer is D) Ransomware. Option A) Virus is incorrect because a virus is a type of malware that replicates itself, but it does not necessarily demand payment. Option B) Worm is incorrect because a worm is a type of malware that spreads from system to system, but it does not necessarily encrypt files. Option C) Trojan is incorrect because a Trojan is a type of malware that disguises itself as legitimate software, but it does not necessarily demand payment.
A company needs to transfer large files over the internet. Which protocol is best suited for this task?
Explanation
The correct answer is TCP because it provides guaranteed delivery and packet reassembly in the correct order, making it suitable for transferring large files. This is due to TCP's connection-oriented approach, which establishes a connection between the sender and receiver before data is sent, and its use of sequence numbers to ensure packets are reassembled in the correct order. UDP, on the other hand, is connectionless and does not guarantee delivery, making it less suitable for large file transfers. HTTP is an application-layer protocol used for transferring web pages, not large files. FTP is a protocol used for file transfer, but it relies on TCP for guaranteed delivery. The incorrect options represent common misconceptions about transport layer protocols, including confusing the functions of TCP and UDP, and misunderstanding the role of HTTP and FTP in file transfer.
A company is setting up a new network with 10 devices. Which topology would be most suitable for this setup?
Explanation
The correct answer is Star Topology. In a star topology, all devices are connected to a central device, such as a switch or hub. This makes it easy to install, maintain, and troubleshoot the network, as each device can be connected or disconnected without affecting the others. Additionally, star topology requires minimal cabling, making it a cost-effective option. Bus topology (A) is incorrect because it uses a single cable to connect all devices, which can be prone to signal degradation and difficult to troubleshoot. Ring topology (B) is also incorrect because it is more complex to install and maintain, and a single fault in the ring can bring down the entire network. Mesh topology (D) is incorrect because it is more expensive and complex to set up, requiring each device to be connected to every other device.
What is the primary purpose of a scheduler in an operating system?
Explanation
The primary purpose of a scheduler in an operating system is to allocate CPU time to processes, ensuring efficient execution. This is a critical function, as it enables the operating system to manage multiple tasks concurrently, prioritize tasks based on their urgency and importance, and optimize system performance. The scheduler uses algorithms such as First-Come-First-Served, Shortest Job First, or Priority Scheduling to allocate CPU time. In the context of the company developing a real-time operating system, an efficient scheduler is crucial to ensure that tasks are executed within strict time constraints. Distractor A targets the misconception that a scheduler is responsible for memory management, distractor B targets the misconception that a scheduler provides a user interface, and distractor D targets the misconception that a scheduler handles input/output operations.
Which storage device is most suitable for storing large amounts of data that needs to be accessed quickly?
Explanation
The correct answer is A) Solid State Drive (SSD) because SSDs offer faster access times and higher data transfer rates compared to other storage devices, making them ideal for storing large amounts of data that require quick access. SSDs use flash memory to store data, which allows for faster read and write operations. In contrast, HDDs (option B) are slower due to their mechanical components, flash drives (option C) have limited capacity and slower transfer rates, and CD-ROMs (option D) are read-only and have very slow transfer rates. This question requires the application of knowledge about the characteristics of different storage devices to a practical scenario, making it a concept application question.
A company collects customer data for marketing purposes. What is the primary concern regarding customer privacy?
Explanation
The primary concern regarding customer privacy is ensuring that customers have given their consent to the collection and use of their data. This is a fundamental principle of data protection, as it respects the customers' autonomy and right to control their personal information. Option B is correct because it highlights the importance of obtaining customers' opt-in consent before collecting and using their data. Option A is incorrect because while data encryption is important for security, it does not address the primary concern of customer consent. Option C is also incorrect because anonymizing customer data may not be sufficient to protect their privacy, as it may still be possible to identify individuals through other means. Option D is incorrect because storing data in a secure facility is important for security, but it does not address the issue of customer consent. This question requires the application of security analysis skills to evaluate the primary concern regarding customer privacy.
What type of encryption uses a public key to encrypt data and a private key to decrypt it?
Explanation
The correct answer is C) Asymmetric encryption. Asymmetric encryption, also known as public-key encryption, uses a pair of keys: a public key to encrypt the data and a private key to decrypt it. This method is commonly used for secure data transmission over the internet. Symmetric encryption (A) uses the same key for both encryption and decryption. Hashing (B) is a one-way process that creates a fixed-size string of characters from input data, but it's not used for encryption. Digital signature (D) is a technique used to verify the authenticity of a message, but it's not a type of encryption. The principle behind asymmetric encryption is that the public key can be shared freely without compromising the security of the private key, making it a widely used method for secure data transmission.
A company's network is infected with malware that encrypts files and demands payment in exchange for the decryption key. What type of malware is this?
Explanation
This is an example of ransomware, a type of malware that encrypts files and demands payment in exchange for the decryption key. Ransomware typically spreads through phishing emails or exploited vulnerabilities. The correct answer is D) Ransomware. Option A) Virus is incorrect because a virus is a type of malware that replicates itself, but it does not necessarily demand payment. Option B) Worm is incorrect because a worm is a type of malware that spreads from system to system without the need for human interaction, but it does not typically demand payment. Option C) Trojan is incorrect because a trojan is a type of malware that disguises itself as legitimate software, but it does not typically encrypt files and demand payment.
A company's IT department has discovered that an employee has been accessing sensitive customer data without authorization. The employee claims they were just trying to help a friend who had forgotten their account information. What should the company do first in this situation?
Explanation
The correct answer is B because conducting a thorough investigation is essential to determine the extent of the breach and the employee's motivations. This helps the company to understand the situation, identify potential vulnerabilities, and take appropriate action. Option A is incorrect because terminating the employee's contract without an investigation may be premature and potentially unfair. Option C is incorrect because giving the employee a warning and providing additional training may not be sufficient if the breach was intentional or malicious. Option D is incorrect because allowing the employee to continue accessing the data without a thorough investigation and proper authorization is a security risk.