Computer networking MCQ – Change your future

881. Full duplex mode increases capacity of each domain from

Correct Answer: Correct answer is: (A) 10 to 20 mbps.

Exam Relevance: CCNA, CompTIA Network+, Cisco Certified Network Associate

Difficulty: Easy

Concept notes: In full duplex mode, data can be transmitted and received simultaneously, effectively doubling the capacity of each domain.

Common Mistakes: Students may confuse full duplex with half duplex, where only one direction of data transfer is possible at a time.

Explanations: Full duplex mode allows simultaneous transmission and reception of data, which doubles the capacity of each domain. Therefore, if the original capacity is 10 Mbps, full duplex mode increases it to 20 Mbps.

Option Analysis:

Option A: Correct, as full duplex doubles the capacity from 10 Mbps to 20 Mbps.
Option B: Incorrect, as 20 to 30 Mbps does not represent the doubling effect of full duplex.
Option C: Incorrect, as 30 to 40 Mbps does not represent the doubling effect of full duplex.
Option D: Incorrect, as 40 to 50 Mbps does not represent the doubling effect of full duplex.

Mnemonic: Double Duplex, Double Capacity

882. Which of the following services use UDP? 1. DHCP 2. SMTP 3. SNMP 4. FTP 5. HTTP 6. TFTP

Correct Answer: Correct answer is: (A) 1, 3 and 6.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The question tests the understanding of which services use the User Datagram Protocol (UDP) for communication.

Common Mistakes: Students often confuse UDP and TCP services, leading to incorrect selection of services that use TCP.

Explanations: DHCP (Dynamic Host Configuration Protocol) uses UDP for communication, specifically UDP port 67 for servers and UDP port 68 for clients. SNMP (Simple Network Management Protocol) also uses UDP, typically on port 161 for communication between network management systems and network devices. TFTP (Trivial File Transfer Protocol) is a simple file transfer protocol that uses UDP for data transfer. SMTP (Simple Mail Transfer Protocol), FTP (File Transfer Protocol), and HTTP (Hypertext Transfer Protocol) all use TCP for reliable data transmission.

Option Analysis:

Option A: Correct. DHCP, SNMP, and TFTP use UDP.
Option B: Incorrect. SMTP and FTP use TCP, not UDP.
Option C: Incorrect. SMTP and FTP use TCP, not UDP.
Option D: Incorrect. Not all services listed use UDP.

883. In a..... connection, more than two devices can share a single link.

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Easy

Concept notes: In a multipoint connection, multiple devices can share a single link, allowing for communication between more than two devices simultaneously.

Common Mistakes: Students may confuse multipoint connections with point-to-point connections, which only allow communication between two devices.

Explanations: A multipoint connection allows more than two devices to share a single link, facilitating communication among multiple devices. This is in contrast to a point-to-point connection, which only allows communication between two devices.

Option Analysis:

Option A: Point-to-point connections only allow communication between two devices, not multiple devices sharing a single link.
Option B: Multipoint connections allow more than two devices to share a single link, making it the correct answer.
Option C: Primary connections are not a standard term in networking and do not describe the sharing of a single link among multiple devices.
Option D: Secondary connections are not a standard term in networking and do not describe the sharing of a single link among multiple devices.

884. The downstream data occupies

Correct Answer: Correct answer is: (A) Upper band.

Exam Relevance: GATE, GRE, ECE Competitive Exams

Difficulty: Easy

Concept notes: In communication systems, the upper band of the frequency spectrum is often used for downstream data transmission due to its higher capacity and less susceptibility to interference.

Common Mistakes: Students may confuse the bands used for upstream and downstream data, thinking that the lower band is used for downstream data.

Explanations: The upper band of the frequency spectrum is typically used for downstream data transmission because it can carry more data at higher speeds. This band is less prone to interference compared to the lower band, making it suitable for delivering high-speed data to users.

Option Analysis:

Option A: Correct. The upper band is used for downstream data.
Option B: Incorrect. The lower band is not used for downstream data.
Option C: Incorrect. The middle band is not typically used for downstream data.
Option D: Incorrect. The upper band is the correct choice.

Mnemonic: Upper Band, More Data, Faster Speed

885. The star topology is used in

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Easy

Concept notes: The star topology is a network configuration where all devices are connected to a central hub or switch.

Common Mistakes: Students may confuse the star topology with other network topologies like bus or ring, which do not involve a central hub.

Explanations: In a Local Area Network (LAN), the star topology is commonly used because it allows for easy management and troubleshooting. Each device is directly connected to a central hub or switch, which simplifies the network structure and makes it easier to isolate and fix issues. This topology is less common in WANs and MANs due to the larger geographical spread and the need for more complex routing.

Option Analysis:

Option A: Correct. The star topology is widely used in LANs for its simplicity and ease of management.
Option B: Incorrect. WANs typically use more complex topologies due to the larger geographical area.
Option C: Incorrect. MANs also tend to use more complex topologies to handle the larger scale of the network.
Option D: Incorrect. Internetworks involve multiple networks and often use a combination of topologies, not just the star topology.

Mnemonic: Star = Central Hub, Think LAN

886. This layer is an addition to OSI model when compared with TCP IP model

Correct Answer: Correct answer is: (D) Both Session and Presentation layer.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The OSI model has seven layers, while the TCP/IP model has four layers. The Session and Presentation layers of the OSI model do not have direct equivalents in the TCP/IP model.

Common Mistakes: Students may mistakenly believe that the Application layer in the OSI model is the only layer not present in the TCP/IP model.

Explanations: The OSI model includes the Session and Presentation layers, which are not present in the TCP/IP model. The Session layer manages sessions between applications, while the Presentation layer handles data representation and encryption. These layers are additional in the OSI model compared to the TCP/IP model, which combines these functions into its Application layer.

Option Analysis:

Option A: The Application layer is present in both OSI and TCP/IP models, so it is not an additional layer.
Option B: The Presentation layer is an additional layer in the OSI model, but it is not the only additional layer.
Option C: The Session layer is an additional layer in the OSI model, but it is not the only additional layer.
Option D: Both the Session and Presentation layers are additional layers in the OSI model when compared to the TCP/IP model.

Mnemonic: S-P for Session and Presentation, OSI's extras.

887. The devices in a .....can be linked together either using cables (via USB) or wirelessly (via Bluetooth)

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

Exam Relevance: Computer Networks, IT Fundamentals, Network Security

Difficulty: Easy

Concept notes: A Personal Area Network (PAN) is a network of devices within a small area, typically within a few meters, such as within a room or around a person. Devices in a PAN can be connected using cables (such as USB) or wirelessly (such as Bluetooth).

Common Mistakes: Students may confuse PAN with other types of networks like WAN (Wide Area Network) or MAN (Metropolitan Area Network), which cover larger geographical areas.

Explanations: A Personal Area Network (PAN) is designed to connect devices within a small area, such as a room or around a person. The devices in a PAN can be linked together using cables (via USB) or wirelessly (via Bluetooth). This makes PAN the correct answer as it fits the description provided in the question.

Option Analysis:

Option A: Correct. PAN is the correct term for a network of devices within a small area, which can be connected using cables or wirelessly.
Option B: Incorrect. WAN (Wide Area Network) covers a large geographical area, typically spanning cities, countries, or even continents.
Option C: Incorrect. MAN (Metropolitan Area Network) covers a larger area than a PAN, typically a city or large campus.
Option D: Incorrect. None of the above is not applicable as PAN is the correct answer.

Mnemonic: PAN: Personal Area Network, think "Personal Area, Not far."

888. Internet is a ..... space

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

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: The Internet is a public space because it is accessible to anyone with an internet connection and is not restricted to private or local networks.

Common Mistakes: Students may mistakenly believe the Internet is a private space because they use it for personal activities.

Explanations: The Internet is a public space because it is designed to be accessible to anyone with an internet connection. It is not restricted to private or local networks, making it open to the general public.

Option Analysis:

Option A: Correct. The Internet is a public space because it is accessible to anyone with an internet connection.
Option B: Incorrect. The Internet is not a private space as it is accessible to the general public.
Option C: Incorrect. The Internet is not a local space as it is accessible globally.
Option D: Incorrect. The correct answer is provided in the options.

889. In a.....name space, each name is made of several parts.

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

Exam Relevance: Computer Science, Software Engineering, Database Management

Difficulty: Moderate

Concept notes: In a hierarchical name space, names are structured in a tree-like structure with multiple levels, where each name is composed of several parts.

Common Mistakes: Students may confuse a hierarchical name space with a flat name space, where names are not organized into multiple levels.

Explanations: A hierarchical name space organizes names into a structured hierarchy, with each name consisting of multiple parts that represent different levels in the hierarchy. This structure allows for a more organized and scalable naming system compared to a flat name space, where each name is independent and does not have a hierarchical relationship with other names.

Option Analysis:

Option A: A flat name space does not have a hierarchical structure, so each name is independent and does not consist of multiple parts.
Option B: A hierarchical name space organizes names into a tree-like structure, with each name made up of several parts representing different levels in the hierarchy.
Option C: "Organized" is too vague and does not specifically describe the hierarchical structure of the name space.
Option D: This option is incorrect as a hierarchical name space is a valid concept.

Mnemonic: Hierarchical = Hier-archy, think "high-archy" for high-level structure.

890. Poll/select line discipline requires what to identify the packet recipient?

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

Exam Relevance: Networking exams, Computer Science exams, Telecommunications exams

Difficulty: Moderate

Concept notes: In poll/select line discipline, the address is used to identify the packet recipient.

Common Mistakes: Students may mistakenly believe that a timer or buffer is used to identify the packet recipient, but these components are not responsible for recipient identification.

Explanations: Poll/select line discipline is a method used in communication systems to manage data transmission. The address is crucial because it specifies the intended recipient of the packet. Without the address, the system would not know which device should receive the packet, leading to potential misrouting or loss of data.

Option Analysis:

Option A: A timer is not used to identify the packet recipient; it is used for timing and synchronization purposes.
Option B: A buffer is used to temporarily store data but does not identify the packet recipient.
Option C: The address is used to identify the packet recipient in poll/select line discipline.
Option D: A dedicated line is a physical connection but does not identify the packet recipient in a poll/select context.

Mnemonic: Address, Always, Acknowledge

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Computer networking MCQ - Set 89

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