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Computer Networks Quiz 24 (10 MCQs)

This set of multiple-choice questions evaluates understanding of IP addressing, network classes, host count, and network fundamentals. It covers concepts such as device interconnectivity, information sharing, and data packet routing. The questions also assess knowledge of networking standards like Ethernet and transmission media such as UTP cables, as well as security concerns like unauthorized access and wireless LAN security.

Quiz Instructions

Select an option to see the correct answer instantly.

1. Which of the following is an unauthorised access to a wireless LAN?

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

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Easy

Concept notes: Piggybacking refers to unauthorized access to a wireless network by an individual who is not supposed to have access to it.

Common Mistakes: A common misunderstanding is that piggybacking is a form of malware or ransomware, which it is not. Piggybacking is a method of unauthorized access to a network.

Explanations: Piggybacking is an unauthorized access to a wireless LAN where an individual uses the network without the owner's permission. This is a common security issue in wireless networks. The other options (Malicious Spyware, Lock Screen Ransomware, and Encryption Ransomware) are types of malicious software and do not directly relate to unauthorized access to a wireless network.

Option Analysis:

Option A: Piggybacking is an unauthorized access to a wireless network.
Option B: Malicious Spyware is a type of software designed to gather information without the user's consent.
Option C: Lock Screen Ransomware is a type of ransomware that locks the user's screen and demands a ransom.
Option D: Encryption Ransomware is a type of ransomware that encrypts the user's files and demands a ransom for the decryption key.

2. What will ensure global reach in the future of ICT?

Correct Answer: Correct answer is: (A) Ubiquitous Connectivity.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: Ubiquitous connectivity refers to the widespread availability and accessibility of internet and communication services across the globe. This ensures that people and devices can connect to the internet and communicate with each other regardless of their location.

Common Mistakes: A common misunderstanding is that technological convergence or sustainability and ethics alone can ensure global reach. While these are important factors, they do not directly address the need for widespread and consistent connectivity.

Explanations: Ubiquitous connectivity ensures that all regions and populations have access to the internet and communication networks, which is essential for the future of ICT. This connectivity enables seamless communication, data exchange, and access to information, which are critical components of global reach in ICT.

Option Analysis:

Option A: Ubiquitous Connectivity ensures global reach by providing widespread and consistent access to the internet and communication networks.
Option B: Technological Convergence involves the integration of different technologies, but it does not directly ensure global reach.
Option C: Sustainability and Ethics are important for the responsible development and use of ICT, but they do not directly ensure global reach.
Option D: None of the above is incorrect because Ubiquitous Connectivity is a valid and essential factor for global reach in ICT.

3. What is the maximum length of a UTP cable?

Correct Answer: Correct answer is: (B) 100m.

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

Difficulty: Easy

Concept notes: In computer networks, the maximum length of a UTP (Unshielded Twisted Pair) cable is typically 100 meters for optimal performance and reliability.

Common Mistakes: A common misunderstanding is that UTP cables can be longer than 100 meters without significant performance degradation. However, the standard limit is 100 meters to ensure reliable data transmission.

Explanations: UTP cables are designed to maintain signal integrity and minimize interference over a specific distance. The 100-meter limit is a standard in Ethernet networks to ensure that data transmission is reliable and error-free. Exceeding this length can lead to signal attenuation and increased error rates.

Option Analysis:

Option A: 1km is too long for UTP cables, as it exceeds the standard limit of 100 meters.
Option B: 100m is the correct maximum length for UTP cables to ensure reliable data transmission.
Option C: 50m is within the acceptable range but not the maximum length for UTP cables.
Option D: "Unlimited" is incorrect as UTP cables have a defined maximum length to maintain signal integrity.

4. A system containing or connecting a combination of computers, computer terminals, printers, audio or audio display devices or telephones used to transmit (send) or receive information is called a .....

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

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

Difficulty: Easy

Concept notes: A network is a system that connects multiple devices such as computers, terminals, printers, and other communication devices to share resources and exchange information.

Common Mistakes: A common mistake is to confuse a network with the internet, which is a global network of networks.

Explanations: A network is defined as a system that connects multiple devices to share resources and exchange information. The description in the question matches this definition, as it mentions a combination of computers, terminals, printers, and other devices used to transmit or receive information.

Option Analysis:

Option A: Correct. A network is a system that connects multiple devices to share resources and exchange information.
Option B: Incorrect. The internet is a global network of networks, not a specific system connecting devices in a local context.
Option C: Incorrect. Ms. DowDell's cell phone is a single device and does not describe a system connecting multiple devices.
Option D: Incorrect. The correct answer is provided in the options.

5. What does networking refer to in the context of ICT?

Correct Answer: Correct answer is: (A) The system that connects various devices to share information.

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

Difficulty: Easy

Concept notes: Networking in the context of ICT refers to the system that connects various devices to share information.

Common Mistakes: A common misunderstanding is that networking only involves hardware, but it also includes software and protocols for communication.

Explanations: Networking in ICT is defined as the system that connects various devices to share information. This includes the use of hardware (such as routers and switches) and software (such as network protocols) to enable communication and data exchange between devices. The other options do not accurately describe the concept of networking.

Option Analysis:

Option A: Correct. Networking is the system that connects various devices to share information.
Option B: Incorrect. The process of creating software applications is known as software development, not networking.
Option C: Incorrect. The method of data encryption is a security measure, not networking.
Option D: Incorrect. The hardware used for data storage is related to storage systems, not networking.

6. What is the maximum number of hosts that a Class B network can have?

Correct Answer: Correct answer is: (C) 65,534.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: In a Class B network, the first two octets are used for the network address, and the last two octets are used for the host address. The maximum number of hosts is determined by the number of bits available for the host portion of the IP address.

Common Mistakes: A common mistake is to forget that the first and last IP addresses in a network are reserved for the network address and the broadcast address, respectively.

Explanations: A Class B network has 16 bits available for the host portion of the IP address. The total number of possible addresses is \(2^{16} = 65,536\). However, two addresses are reserved: one for the network address and one for the broadcast address. Therefore, the maximum number of usable host addresses is \(65,536 - 2 = 65,534\).

Option Analysis:

Option A: 254 is incorrect because it is the maximum number of hosts in a Class C network, not a Class B network.
Option B: 32,766 is incorrect because it is the maximum number of hosts in a Class A network, not a Class B network.
Option C: 65,534 is correct because it is the maximum number of hosts in a Class B network after accounting for the reserved network and broadcast addresses.
Option D: 16,777,214 is incorrect because it is the maximum number of hosts in a Class A network, not a Class B network.

7. Two or more computers connected together for sharing files and resources .....

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

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

Difficulty: Easy

Concept notes: A network is a group of computers and devices connected together to share resources and information.

Common Mistakes: A common mistake is confusing a network with a hyperlink, which is a reference to another document or location on the web.

Explanations: A network is defined as two or more computers connected together for sharing files and resources. This aligns with the definition provided in the question. A hyperlink, protocol, or none of the above do not fit this description.

Option Analysis:

Option A: Correct. A network is a group of computers connected together to share resources and information.
Option B: Incorrect. A hyperlink is a reference to another document or location on the web, not a group of connected computers.
Option C: Incorrect. A protocol is a set of rules for communication between devices, not a group of connected computers.
Option D: Incorrect. The correct answer is provided in the options.

8. Which type of transmission media is known as regular telephone wire .....

Correct Answer: Correct answer is: (A) Twisted-pair wire.

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

Difficulty: Easy

Concept notes: Twisted-pair wire is commonly used for telephone lines and is a type of transmission media.

Common Mistakes: A common misunderstanding is that fiber optic cable or coaxial cable might be used for regular telephone wire, but these are typically used for higher-speed data transmission.

Explanations: Twisted-pair wire is the standard transmission media used for regular telephone lines. It consists of two insulated copper wires twisted together to reduce crosstalk and electromagnetic interference. This type of wire is widely used in telecommunication networks for voice and data transmission.

Option Analysis:

Option A: Twisted-pair wire is the correct answer as it is the type of wire used in regular telephone lines.
Option B: Fiber optic cable is not used for regular telephone wire; it is used for high-speed data transmission.
Option C: Coaxial cable is not used for regular telephone wire; it is used for cable television and high-speed internet.
Option D: This option is incorrect as twisted-pair wire is the correct answer.

9. Which layer of the OSI Reference Model is the first layer to receive a message from another device?

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

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

Difficulty: Easy

Concept notes: The Physical layer is the lowest layer of the OSI model and is responsible for the transmission and reception of raw bit streams over a physical medium.

Common Mistakes: A common mistake is to confuse the Physical layer with the Data Link layer, which is responsible for error-free transmission of data frames.

Explanations: The Physical layer is the first layer to receive a message from another device because it is responsible for the physical transmission of data over the network medium. It handles the electrical, mechanical, and procedural interfaces to the network medium.

Option Analysis:

Option A: The Data Link layer is responsible for error-free transmission of data frames, not the initial reception of raw bit streams.
Option B: The Application layer is the highest layer and deals with user applications, not the initial reception of data.
Option C: The Physical layer is the first layer to receive a message from another device as it handles the physical transmission of data over the network medium.
Option D: The Transport layer is responsible for end-to-end communication and does not handle the initial reception of raw bit streams.

10. This protocol transfers data from node to node.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: IP (Internet Protocol) is responsible for transferring data packets from one node to another across a network.

Common Mistakes: A common misunderstanding is that TCP is responsible for data transfer between nodes, but TCP operates at a higher level and relies on IP for actual packet delivery.

Explanations: IP is the protocol that routes and delivers data packets from the source node to the destination node. It ensures that each packet is addressed correctly and can traverse different networks to reach its destination. While other protocols like TCP, SMTP, and HTTP perform specific functions, IP is the fundamental protocol that enables data transfer between nodes.

Option Analysis:

Option A: TCP is a transport layer protocol that ensures reliable data transfer but does not handle node-to-node data transfer directly.
Option B: IP is the correct answer as it is responsible for transferring data packets from one node to another.
Option C: SMTP is an application layer protocol used for email transmission and does not handle node-to-node data transfer.
Option D: HTTP is an application layer protocol used for transferring web content and does not handle node-to-node data transfer.

Frequently Asked Questions

What is the OSI model and how does it relate to computer networks?

The OSI model is a conceptual framework used to understand and standardize the functions of a telecommunication or computing system. It consists of seven layers, each responsible for specific network functions, facilitating the understanding and design of computer networks.

How does a Class B network differ from other IP address classes?

A Class B network supports a large number of hosts by allocating 16 bits for host addresses. This class is suitable for medium-sized networks, providing a balance between the number of networks and the number of hosts per network.

What is the role of twisted-pair wire in data transmission?

Twisted-pair wire, such as UTP cable, is used to reduce electromagnetic interference and crosstalk, ensuring signal integrity during data transmission over short to medium distances in Ethernet networks.

How does piggybacking work in computer networks?

Piggybacking is a technique used in data communication where acknowledgment of received data is combined with outgoing data, reducing the number of transmissions and improving efficiency in network communication.

What is the significance of the Physical layer in the OSI model?

The Physical layer is responsible for the transmission and reception of unstructured raw data between a device and a physical transmission medium. It defines electrical, mechanical, and functional specifications for the hardware.

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