Computer networking MCQ – Change your future

421. A network with over 500 computers connected is considered to be a WAN

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

Exam Relevance: CCNA, CompTIA Network+, ITIL Foundation

Difficulty: Easy

Concept notes: A network with over 500 computers connected is not necessarily a WAN. The classification of a network (LAN, WAN, MAN) depends on factors such as geographical spread, ownership, and connectivity, not just the number of devices.

Common Mistakes: Students often mistakenly believe that the number of devices alone determines the type of network, overlooking other critical factors like geographical spread and connectivity.

Explanations: A Wide Area Network (WAN) typically spans a large geographical area, such as different cities or countries. The number of computers alone does not define a WAN. A network with over 500 computers could be a Local Area Network (LAN) if all devices are within a limited geographical area, such as a single building or campus.

Option Analysis:

Option A: Correct. A network with over 500 computers is not automatically a WAN. The classification depends on other factors like geographical spread and connectivity.
Option B: Incorrect. This option incorrectly assumes that the number of computers alone determines the network type.

422. Which one of these is not a difference between a LAN and a WAN?

Correct Answer: Correct answer is: (D) LANS use binary, WANs use hex.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: The correct answer highlights a misconception about the data representation in LANs and WANs.

Common Mistakes: Students often mistakenly believe that different network types use different data formats, such as binary for LANs and hexadecimal for WANs.

Explanations: LANs and WANs both use binary data representation. The difference between LANs and WANs lies in their geographical coverage, the protocols they use, and the infrastructure they employ. Binary is the fundamental data representation used in all digital networks, regardless of their type.

Option Analysis:

Option A: This is a valid difference. LANs typically cover a small geographical area, while WANs cover a larger area.
Option B: This is a valid difference. LANs often use dedicated cables for their network infrastructure, whereas WANs may use a variety of communication channels.
Option C: This is a valid difference. LANs and WANs use different protocols to manage data transmission, such as Ethernet for LANs and TCP/IP for WANs.
Option D: This is not a valid difference. Both LANs and WANs use binary data representation.

423. If each computer in the computer lab has its own cable connecting directly to the server, which type of topology is this?

Correct Answer: Correct answer is: (A) Star Topology.

Exam Relevance: CCNA, CompTIA Network+, A+ Certification

Difficulty: Easy

Concept notes: In a star topology, each device is connected directly to a central hub or server.

Common Mistakes: Students may confuse star topology with bus topology, where devices are connected to a single backbone cable.

Explanations: In a star topology, each computer is connected directly to a central server or hub. This configuration ensures that each device has its own dedicated connection, which is consistent with the description provided in the question.

Option Analysis:

Option A: Correct. Each computer has its own cable connecting directly to the server, which is characteristic of a star topology.
Option B: Incorrect. In a bus topology, all devices are connected to a single backbone cable, not directly to a server.
Option C: Incorrect. In a ring topology, devices are connected in a circular configuration, not directly to a central server.
Option D: Incorrect. In a mesh topology, devices are connected to multiple other devices, not just to a central server.

Mnemonic: Star = Server at the center, like a star.

424. Sharing is one of the advantages of network.

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

Exam Relevance: AP Computer Science Principles, A+ Certification, CompTIA Network+

Difficulty: Easy

Concept notes: Networks allow users to share resources such as files, printers, and internet connections.

Common Mistakes: Students might think sharing is only possible in physical environments, not understanding the capabilities of networked systems.

Explanations: Networks enable users to share resources and information across multiple devices and locations. This sharing capability is a fundamental advantage of networked systems, allowing for efficient collaboration and resource utilization.

Option Analysis:

Option A: Correct, as sharing is indeed an advantage of networked systems.
Option B: Incorrect, as sharing is a well-known benefit of networks.

425. Controlled private network that allows access to partners, vendors and suppliers or an authorized set of customers - normally to a subset of the information accessible from an organization's intranet

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

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Moderate

Concept notes: An extranet is a controlled private network that allows access to partners, vendors, and suppliers or an authorized set of customers to a subset of the information accessible from an organization's intranet.

Common Mistakes: Students may confuse an extranet with an intranet, which is a private network used exclusively by an organization's internal members, partners, or suppliers.

Explanations: An extranet is designed to extend the reach of an organization's intranet to external parties such as partners, vendors, and suppliers. It provides controlled access to a subset of the information available on the intranet, ensuring that only authorized individuals can access specific resources. This controlled access is crucial for maintaining security and confidentiality while enabling collaboration and information sharing with external entities.

Option Analysis:

Option A: The Internet is a global network of interconnected computers and servers, not a controlled private network.
Option B: Ethernet is a type of local area network (LAN) technology, not a controlled private network for external access.
Option C: An Intranet is a private network used exclusively by an organization's internal members, not for external access.
Option D: An Extranet is a controlled private network that allows access to partners, vendors, and suppliers or an authorized set of customers to a subset of the information accessible from an organization's intranet.

Mnemonic: E for Extranet, External access to a subset of Intranet.

426. Which of the following transport layer protocol is used to support electronic mail?

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: TCP (Transmission Control Protocol) is used to support electronic mail because it provides reliable, connection-oriented communication, which is essential for the transmission of email messages.

Common Mistakes: Students may confuse SMTP (Simple Mail Transfer Protocol) with TCP, as SMTP is the application layer protocol used for sending email, but it relies on TCP for reliable delivery.

Explanations: TCP is the transport layer protocol that ensures reliable delivery of data. Electronic mail requires a reliable transport mechanism to ensure that messages are delivered without errors. SMTP, the application layer protocol used for sending email, operates over TCP to leverage its reliability features. Therefore, TCP is the correct answer as it supports the underlying transport for electronic mail.

Option Analysis:

Option A: SMTP is an application layer protocol used for sending email, not a transport layer protocol.
Option B: IP (Internet Protocol) is a network layer protocol, not a transport layer protocol.
Option C: TCP (Transmission Control Protocol) is a transport layer protocol that provides reliable, connection-oriented communication, which is essential for electronic mail.
Option D: UDP (User Datagram Protocol) is a transport layer protocol but is connectionless and does not provide the reliability needed for electronic mail.

Mnemonic: TCP: Trusty Connection Protocol

427. Hardware needed to connect to a computer to the internet is:

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

Exam Relevance: CompTIA A+, CCNA, Network+ exams

Difficulty: Easy

Concept notes: A NIC (Network Interface Card) is essential hardware for connecting a computer to a network or the internet.

Common Mistakes: Students may confuse software like Internet Explorer with hardware components.

Explanations: A NIC is a hardware component that enables a computer to connect to a network or the internet. It provides the necessary physical interface and protocols for communication. Internet Explorer is a software application for browsing the web, not a hardware component. CAT5 cabling and WAP (Wireless Access Point) are also important for network connectivity but are not the primary hardware needed to connect a computer to the internet.

Option Analysis:

Option A: NIC is the correct hardware component for connecting a computer to a network or the internet.
Option B: Internet Explorer is a web browser, not a hardware component.
Option C: CAT5 cabling is a type of network cable, but it is not the primary hardware needed to connect a computer to the internet.
Option D: WAP is a device that allows wireless devices to connect to a wired network, but it is not the primary hardware needed to connect a computer to the internet.

Mnemonic: NIC - Network Interface Card

428. Device used to connect multiple networks

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: A router is a device used to connect multiple networks and route data packets between them.

Common Mistakes: Students may confuse a router with a switch or hub, which are used for connecting devices within a single network rather than connecting multiple networks.

Explanations: A router is specifically designed to connect multiple networks and route data packets between them. It uses routing protocols to determine the best path for data to travel from one network to another. This makes it the correct choice for connecting multiple networks.

Option Analysis:

Option A: A hub is a simple device that connects multiple devices on a single network and broadcasts data to all connected devices. It does not connect multiple networks.
Option B: A switch is a more advanced device than a hub, used to connect multiple devices on a single network. It does not connect multiple networks.
Option C: A router is used to connect multiple networks and route data packets between them, making it the correct choice.
Option D: A connector is a device used to physically connect cables or devices, but it does not have the capability to connect multiple networks.

Mnemonic: Routers Route, Switches Switch, Hubs Hub, Connectors Connect.

429. Which of the following is a valid domain name?

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

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: A domain name is a unique identifier for a website or network. It typically consists of a name followed by a top-level domain (TLD) such as .com, .org, .edu, etc.

Common Mistakes: Students may confuse file extensions (like .bin, .jpg) with domain names, or think that protocols (like http) are part of a domain name.

Explanations: The correct answer is .org. because it is a valid top-level domain used for organizations. The other options are not valid domain names: .bin and .jpg are file extensions, and .http is a protocol, not a domain.

Option Analysis:

Option A: .bin is a file extension, not a domain name.
Option B: .jpg is a file extension, not a domain name.
Option C: .org is a valid top-level domain for organizations.
Option D: .http is a protocol, not a domain name.

430. The protocol data unit(PDU) for the application layer in the Internet stack is?

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: The protocol data unit (PDU) for the application layer in the Internet stack is a message.

Common Mistakes: Students often confuse the PDU of the application layer with those of lower layers, such as segments (transport layer) or datagrams (network layer).

Explanations: The application layer is the highest layer in the Internet stack and deals directly with the user's application. The PDU at this layer is referred to as a message, which is the data that the application sends or receives. Segments and datagrams are PDUs used at the transport and network layers, respectively, while frames are used at the data link layer.

Option Analysis:

Option A: Segments are the PDUs used at the transport layer, not the application layer.
Option B: Datagrams are the PDUs used at the network layer, not the application layer.
Option C: Messages are the PDUs used at the application layer, which is correct.
Option D: Frames are the PDUs used at the data link layer, not the application layer.

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Computer networking MCQ - Set 43

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