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Computer Networks Quiz 42 (10 MCQs)

This set of multiple-choice questions evaluates understanding of data transmission, network fundamentals, and related concepts such as data encapsulation, packet switching, network protocols, error detection, and parity bit usage. It also covers network reliability, redundancy, fault tolerance, and the roles of communication media and methods, including LAN login and wireless communication. The questions assess knowledge of UK academic networks like JANET and the Joint Academic NETwork, as well as the physical layer and TCP/IP roles.

Quiz Instructions

Select an option to see the correct answer instantly.

1. Having multiple paths to a destination is known as redundancy. This is an example of which characteristic of network architecture?

Correct Answer: Correct answer is: (A) Fault tolerance.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Moderate

Concept notes: Fault tolerance in network architecture refers to the ability of a network to continue operating even when some components fail. Redundancy, or having multiple paths to a destination, is a key aspect of fault tolerance as it ensures that data can still be transmitted even if one path is unavailable.

Common Mistakes: A common misunderstanding is that redundancy is primarily related to security or scalability. However, redundancy is specifically designed to ensure that the network can continue to function even if some parts fail, which is the essence of fault tolerance.

Explanations: Redundancy in network architecture ensures that there are multiple paths to a destination. This means that if one path fails, another can be used to maintain network connectivity. This characteristic is known as fault tolerance because it allows the network to continue functioning even in the presence of failures.

Option Analysis:

Option A: Correct. Fault tolerance is the ability of a network to continue operating even when some components fail, which is achieved through redundancy.
Option B: Incorrect. Scalability refers to the ability of a network to grow and handle increased load, not to maintain operation in the presence of failures.
Option C: Incorrect. QoS (Quality of Service) is about ensuring that certain types of network traffic receive priority, not about maintaining network operation in the presence of failures.
Option D: Incorrect. Security is about protecting the network from unauthorized access and attacks, not about maintaining network operation in the presence of failures.

2. What is a communication media?

Correct Answer: Correct answer is: (C) Physical connection between devices.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Easy

Concept notes: In computer networks, communication media refers to the physical means by which data is transmitted between devices.

Common Mistakes: A common misunderstanding is that communication media are the devices themselves, such as servers or clients, rather than the physical connections between them.

Explanations: Communication media in computer networks are the physical components that enable data transmission, such as cables, fiber optics, or wireless signals. These media provide the necessary pathways for devices to exchange information.

Option Analysis:

Option A: This describes a server, not communication media.
Option B: This describes a client, not communication media.
Option C: This correctly identifies communication media as the physical connection between devices.
Option D: This describes a circuit board, not communication media.

3. The information network that connects universities and colleges in United Kingdom:

Correct Answer: Correct answer is: (A) JANET.

Exam Relevance: Computer Networks Exams, Information Technology Exams, Networking Certification Exams

Difficulty: Moderate

Concept notes: JANET stands for Joint Academic NETwork, which is the information network that connects universities and colleges in the United Kingdom.

Common Mistakes: A common mistake is confusing JANET with other similar-sounding networks, such as NICNET or BONET, which are not related to the UK academic network.

Explanations: JANET is the correct answer because it is the specific network designed to connect educational institutions in the United Kingdom. It provides high-speed internet connectivity and various services to support academic research and collaboration.

Option Analysis:

Option A: Correct. JANET is the Joint Academic NETwork that connects universities and colleges in the UK.
Option B: Incorrect. NICNET is the National Informatics Centre Network, which is not related to UK academic institutions.
Option C: Incorrect. OCLC stands for Online Computer Library Center, which is a global library cooperative and not a UK academic network.
Option D: Incorrect. BONET is the Bombay Library Network, which is not related to UK academic institutions.
Option E: This option provides full forms but does not answer the question.

Mnemonic: JANET: Join Academics Network, Educate Together

4. A type of computer network that uses radio waves as a transmission medium

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

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Easy

Concept notes: WLAN stands for Wireless Local Area Network, which uses radio waves to transmit data.

Common Mistakes: A common mistake is confusing WLAN with other types of networks like LAN or WAN, which do not necessarily use radio waves.

Explanations: WLAN uses radio waves as a transmission medium to connect devices within a local area. This makes it distinct from other network types like LAN, which typically use wired connections, and WAN, which can use various transmission mediums including wired and satellite links.

Option Analysis:

Option A: Microwave networks use radio waves but are typically used for long-distance communication, not local area networks.
Option B: LAN (Local Area Network) typically uses wired connections like Ethernet cables, not radio waves.
Option C: WAN (Wide Area Network) can use various transmission mediums, including wired and satellite links, but is not specifically defined by the use of radio waves.
Option D: WLAN (Wireless Local Area Network) uses radio waves to connect devices within a local area, making it the correct answer.

5. Which one of the following does NOT state the purpose of a computer network.

Correct Answer: Correct answer is: (D) Spreading Viruses.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: The purpose of a computer network is to facilitate communication, data sharing, and easier administration among connected devices. Spreading viruses is not a legitimate purpose of a computer network.

Common Mistakes: A common misunderstanding is that all activities on a network are intentional and beneficial. However, malicious activities like spreading viruses are not part of the intended purpose of a network.

Explanations: A computer network is designed to enable the sharing of resources, data, and communication between devices. Data protection, sharing data, and easier administration are all valid purposes of a network. Spreading viruses, however, is an unintended and harmful activity that does not align with the purpose of a computer network.

Option Analysis:

Option A: Data Protection is a valid purpose of a computer network, as networks often include security measures to protect data.
Option B: Share Data is a primary purpose of a computer network, allowing multiple users to access and share information.
Option C: Easier Administration is another valid purpose, as networks can simplify the management of multiple devices and resources.
Option D: Spreading Viruses is not a purpose of a computer network; it is a malicious activity that can harm the network and its users.

6. Repeaters function in

Correct Answer: Correct answer is: (A) Physical layer.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Administrator

Difficulty: Easy

Concept notes: Repeaters operate at the Physical layer of the OSI model. They regenerate and amplify signals to extend the length of a network segment.

Common Mistakes: A common misunderstanding is that repeaters operate at higher layers, such as the Data Link layer or Network layer. However, repeaters only deal with the physical transmission of bits.

Explanations: Repeaters function at the Physical layer because they are designed to amplify and regenerate the electrical, optical, or wireless signals that carry data. They do not interpret or modify the data itself, only the physical signal. This is why they are classified as Physical layer devices.

Option Analysis:

Option A: Correct. Repeaters operate at the Physical layer.
Option B: Incorrect. Repeaters do not operate at the Data Link layer.
Option C: Incorrect. Repeaters do not operate at the Network layer.
Option D: Incorrect. Repeaters do not operate at both the Physical and Data Link layers.

7. Consider the following Statements: A LAN usually requires a login to access the network The window borders are the lines that surround a window. TCP and IP perform the same roles. Which of the following statement(s) is/are true?

Correct Answer: Correct answer is: (A) Only 1, 2.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: A LAN (Local Area Network) typically requires a login to access the network. The window borders are the lines that surround a window on a computer screen. TCP (Transmission Control Protocol) and IP (Internet Protocol) perform different roles in networking.

Common Mistakes: A common misunderstanding is that TCP and IP perform the same roles, when in fact, TCP is responsible for ensuring reliable data transmission, while IP is responsible for addressing and routing packets.

Explanations: A LAN usually requires a login to access the network, which is true. The window borders are the lines that surround a window on a computer screen, which is also true. However, TCP and IP perform different roles in networking. TCP is responsible for ensuring reliable data transmission, while IP is responsible for addressing and routing packets. Therefore, the statement that TCP and IP perform the same roles is false.

Option Analysis:

Option A: Only 1, 2. This option is correct because statements 1 and 2 are true, while statement 3 is false.
Option B: Only 1, 3. This option is incorrect because statement 3 is false.
Option C: Only 1, 2, 3. This option is incorrect because statement 3 is false.
Option D: Only 2, 3. This option is incorrect because statement 3 is false.

8. Which of the following uses parity bits to check that data has been transmitted accurately?

Correct Answer: Correct answer is: (C) Error checking.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Moderate

Concept notes: Parity bits are used in error checking to ensure data integrity during transmission.

Common Mistakes: A common misunderstanding is that parity bits are used for encryption or decoding, which is incorrect. Parity bits are specifically used for error detection.

Explanations: Parity bits are used in error checking to detect errors in data transmission. When data is sent over a network, a parity bit is added to each data unit. The parity bit ensures that the total number of 1s in the data unit is either even or odd, depending on the type of parity used. Upon receiving the data, the receiver checks the parity to determine if any errors occurred during transmission. If the parity does not match, it indicates an error in the data.

Option Analysis:

Option A: Decoding is the process of converting encoded data back to its original form, not related to error checking.
Option B: Encryption is the process of converting data into a secure format to prevent unauthorized access, not related to error checking.
Option C: Error checking is the process of verifying the integrity of data during transmission, which uses parity bits.
Option D: This option is incorrect as error checking is the correct use of parity bits.

9. What are the main methods of communication listed?

Correct Answer: Correct answer is: (A) Text, voice, video.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: In computer networks, the main methods of communication include text, voice, and video.

Common Mistakes: A common misunderstanding is that only one form of communication is used in computer networks, when in fact multiple forms are commonly employed.

Explanations: Text, voice, and video are the primary methods of communication in computer networks. Text communication includes emails, instant messages, and chat applications. Voice communication includes VoIP (Voice over Internet Protocol) services like Skype and Zoom. Video communication includes video conferencing and streaming services. These methods are widely used and integrated into various network applications.

Option Analysis:

Option A: Correct. Text, voice, and video are the main methods of communication in computer networks.
Option B: Incorrect. High-resolution images are a form of data transmission but are not the main methods of communication.
Option C: Incorrect. Gestures without sound are not a primary method of communication in computer networks.
Option D: Incorrect. Paper notes between neighbors are not a method of communication in computer networks.

10. Information is broken down into what before being sent across the internet?

Correct Answer: Correct answer is: (C) Data Packets.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: In computer networks, information is broken down into smaller units called data packets before being transmitted across the internet.

Common Mistakes: A common misunderstanding is that information is sent as complete files or email messages without being broken down.

Explanations: Data packets are the fundamental units of data transmission in computer networks. When information is sent over the internet, it is divided into these smaller packets to ensure efficient and reliable transmission. Each packet contains a portion of the original data along with header information that includes source and destination addresses, sequence numbers, and other control information. This allows the packets to be routed independently across the network and reassembled at the destination to reconstruct the original information.

Option Analysis:

Option A: Email messages are not broken down into smaller units before transmission; they are typically encapsulated within data packets.
Option B: Files are not sent as whole units; they are broken down into data packets for transmission.
Option C: Data packets are the correct answer as they are the units into which information is divided before transmission.
Option D: Ports are used for communication between applications but are not the units into which information is broken down.

Frequently Asked Questions

What is the purpose of a computer network?

A computer network allows multiple devices to communicate and share resources, such as data and hardware, enhancing collaboration and efficiency.

What is the role of TCP/IP in computer networks?

TCP/IP is a set of protocols that govern how data is transmitted and received over a network, ensuring reliable and error-free communication between devices.

What is a LAN login?

A LAN login is the process of authenticating a user to access a local area network, typically requiring a username and password to establish a connection.

What is the Physical layer in network architecture?

The Physical layer is the lowest layer in the OSI model, responsible for the physical connection and transmission of raw data bits over a communication medium.

What is data integrity in computer networks?

Data integrity ensures that data remains accurate and consistent during transmission, using techniques like error checking and parity bits to detect and correct errors.

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