Computer networking MCQ

1491. Which of the following is a true statement?

Correct Answer: Correct answer is: (B) Every website in the world has a unique address.

Exam Relevance: AP Computer Science Principles, SAT Subject Test in Computer Science

Difficulty: Moderate

Concept notes: Each website has a unique address to ensure that web browsers can accurately locate and access the specific site requested by the user.

Common Mistakes: Students may mistakenly believe that website addresses can be duplicated or that similar addresses can exist for different websites.

Explanations: Every website has a unique address, known as a URL (Uniform Resource Locator). This ensures that when a user types in a specific address, they are directed to the correct website. The uniqueness of the address is enforced by domain name registrars, which manage the registration of domain names to prevent duplication.

Option Analysis:

Option A: This is incorrect because domain names are not available for anyone to choose freely; they must be registered and are unique.
Option B: This is correct because every website has a unique address to ensure accurate navigation.
Option C: This is incorrect because .com and .net are different top-level domains and do not represent the same website.
Option D: This is incorrect because .fr is the country code for France, not the UK.

Mnemonic: URLs are like unique street addresses for websites.

1492. Radiowaves to transmit data

Correct Answer: Correct answer is: (B) Wireless.

Exam Relevance: SAT, ACT, AP Physics

Difficulty: Easy

Concept notes: Radiowaves are used to transmit data without the need for physical connections, making them a wireless technology.

Common Mistakes: Students may confuse radiowaves with wired technologies, which require physical connections like cables.

Explanations: Radiowaves transmit data through the air using electromagnetic waves, which do not require any physical medium like wires. This makes radiowaves a wireless technology, allowing for data transmission over long distances without the need for cables or other physical connections.

Option Analysis:

Option A: Wired technologies use physical connections like cables to transmit data, which is not applicable to radiowaves.
Option B: Radiowaves transmit data wirelessly, making this the correct choice.
Option C: Local typically refers to a limited area, which does not specifically describe the wireless nature of radiowaves.
Option D: Wide typically refers to a broad area, which does not specifically describe the wireless nature of radiowaves.

1493. Why do we use a network?

Correct Answer: Correct answer is: (B) To easily share documents.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: Networks allow multiple computers to connect and share resources, including documents.

Common Mistakes: Students may confuse the purpose of a network with other non-functional aspects like installing cables or losing data.

Explanations: Networks facilitate the sharing of documents among multiple users, making collaboration and resource distribution more efficient.

Option Analysis:

Option A: Sharing viruses is not a purpose of a network; it is an unintended consequence of network vulnerabilities.
Option B: Networks enable users to easily share documents, which is a primary function.
Option C: Installing cables is a part of network setup, not the purpose of a network.
Option D: Losing data is not a purpose of a network; it is a potential risk.

1494. Which type of topology is best suited for large businesses which must carefully control and coordinate the operation of distributed branch outlets?

Correct Answer: Correct answer is: (B) Star.

Exam Relevance: CCNA, Network+, CIW

Difficulty: Moderate

Concept notes: In a star topology, all devices are connected to a central hub or switch. This centralization allows for easier management and control of network operations, making it suitable for large businesses with distributed branch outlets.

Common Mistakes: Students may mistakenly believe that a ring topology is better for large businesses because it can handle more devices. However, the centralized control and ease of management in a star topology make it more suitable for large businesses.

Explanations: A star topology is best suited for large businesses with distributed branch outlets because it allows for centralized control and coordination. In a star topology, all devices are connected to a central hub or switch, which simplifies network management and troubleshooting. This centralized structure ensures that the main office can easily monitor and control the operations of all branch outlets, making it ideal for large businesses that need to maintain strict control over their distributed network.

Option Analysis:

Option A: A ring topology is not ideal for large businesses because it lacks centralized control and can be more complex to manage, especially with many devices.
Option B: A star topology is the correct choice because it provides centralized control and simplifies network management, making it suitable for large businesses with distributed branch outlets.
Option C: Both is incorrect because a ring topology does not offer the centralized control and ease of management that a star topology provides.

Mnemonic: Star for control, ring for round.

1495. Which allows for the safest connection?

Correct Answer: Correct answer is: (B) Cables.

Exam Relevance: AP Computer Science Principles, SAT Subject Test in Computer Science

Difficulty: Easy

Concept notes: Cables provide a more secure connection compared to wireless connections due to reduced vulnerability to external interference and hacking.

Common Mistakes: Students may mistakenly believe that wireless connections are safer because they are more convenient and widely used.

Explanations: Cables offer a safer connection because they are less susceptible to external interference and hacking attempts. Wireless connections can be intercepted or disrupted by various means, including unauthorized access and signal interference. Cables, on the other hand, provide a direct, physical connection that is harder to compromise.

Option Analysis:

Option A: Wireless connections are more vulnerable to external interference and hacking, making them less safe.
Option B: Cables provide a more secure and stable connection, reducing the risk of external interference and unauthorized access.

Mnemonic: Cables = Closer Connection

1496. Which of the domain suffixes would lead you to expect that the information was more geared to selling something than giving information?

Correct Answer: Correct answer is: (C) .com.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: The .com domain suffix is typically used by commercial websites, which are often focused on selling products or services.

Common Mistakes: Students may confuse .com with .edu, which is used for educational institutions and is more likely to provide informational content.

Explanations: The .com domain suffix is commonly associated with commercial websites. These sites are primarily designed for businesses to sell products or services, making them more likely to focus on sales rather than providing purely informational content. In contrast, other domain suffixes like .edu, .net, and .gov are typically used for educational, network, and government purposes, respectively, and are more likely to provide informational content.

Option Analysis:

Option A: .edu is used for educational institutions and is more likely to provide informational content.
Option B: .net is often used for network-related services and can be used by both commercial and non-commercial entities, but it is not as strongly associated with commercial activities as .com.
Option C: .com is the correct answer as it is primarily used by commercial entities focused on selling products or services.
Option D: .gov is used for government websites and is more likely to provide informational content related to government services and policies.

1497. The ..... layer is the top most layer in the OSI model

Correct Answer: Correct answer is: (D) Application.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Very Easy

Concept notes: The OSI model is a conceptual framework used to describe the functions of a networking system. It consists of seven layers, with the Application layer being the topmost layer.

Common Mistakes: Students often confuse the layers of the OSI model, particularly the Application layer with other layers such as the Session or Transport layers.

Explanations: The Application layer is the topmost layer in the OSI model. It is responsible for providing services directly to end-users, such as file transfers, email, and web browsing. This layer interacts with software applications and is the interface between the network and the user.

Option Analysis:

Option A: The Physical layer is the lowest layer in the OSI model, responsible for the physical transmission of data.
Option B: The Transport layer is responsible for end-to-end communication and is not the topmost layer.
Option C: The Session layer manages sessions between applications and is below the Application layer.
Option D: The Application layer is the topmost layer, providing services directly to end-users.

1498. When the attack intercepts communications between computers to steal information transmitting through the network.. This attack is called:

Correct Answer: Correct answer is: (A) Man-in-the-Middle.

Exam Relevance: CISSP, CompTIA Security+, CEH

Difficulty: Moderate

Concept notes: A Man-in-the-Middle (MitM) attack occurs when an attacker intercepts and possibly alters the communication between two parties without their knowledge.

Common Mistakes: Students may confuse MitM attacks with other types of attacks like DNS poisoning or spoofing, which also involve deception but do not necessarily intercept ongoing communications.

Explanations: In a Man-in-the-Middle attack, the attacker positions themselves between two communicating parties, intercepting and potentially altering the data being transmitted. This allows the attacker to steal information, such as login credentials or sensitive data, without the knowledge of the communicating parties. The attack is specifically designed to intercept ongoing communications, making it the correct answer.

Option Analysis:

Option A: Correct. Man-in-the-Middle attacks involve intercepting and possibly altering the communication between two parties.
Option B: Incorrect. Replay attacks involve the unauthorized reuse of data from a previous legitimate communication.
Option C: Incorrect. DNS poisoning involves corrupting the DNS cache to redirect traffic to malicious sites.
Option D: Incorrect. Spoofing involves masquerading as another entity to gain unauthorized access or information.

Mnemonic: MITM: Middle Intercept Trap

1499. MAC address consists of how many bits?

Correct Answer: Correct answer is: (D) 48.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: The MAC address is a unique identifier assigned to network interfaces for communications at the data link layer of a network segment.

Common Mistakes: Students often confuse the length of a MAC address with other network identifiers, such as IP addresses, which are 32 bits for IPv4 and 128 bits for IPv6.

Explanations: A MAC address consists of 48 bits, which is 6 bytes. This is a standard format used in Ethernet and other network technologies to uniquely identify devices on a network.

Option Analysis:

Option A: 32 bits is incorrect as it is the length of an IPv4 address, not a MAC address.
Option B: 38 bits is not a standard length for any network identifier.
Option C: 40 bits is not a standard length for any network identifier.
Option D: 48 bits is the correct length for a MAC address.

Mnemonic: MAC 48, Network's Key

1500. ..... describes how much time it takes for a data packet to travel across the network.

Correct Answer: Correct answer is: (B) Latency.

Exam Relevance: AP Computer Science Principles, CompTIA Network+

Difficulty: Easy

Concept notes: Latency is a measure of the time delay experienced in a system, particularly the delay before a transfer of data begins following an instruction for its transfer.

Common Mistakes: Students may confuse latency with bandwidth, which measures the amount of data that can be transferred over a network, not the time it takes.

Explanations: Latency describes the time it takes for a data packet to travel across the network. It is a critical measure in network performance, indicating the delay before data transfer begins.

Option Analysis:

Option A: Larceny is a legal term for theft and is unrelated to network performance metrics.
Option B: Latency is the correct term for the time delay in data transmission.
Option C: Literacy is the ability to read and write and is unrelated to network performance.
Option D: Lag is often used colloquially to describe latency, but the precise term is latency.

Mnemonic: L for Latency, L for Lag, L for Long wait.

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Computer networking MCQ - Set 150

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