Computer networking MCQ – Change your future

11. 3G's speed can reach up to .....

Correct Answer: Correct answer is: (D) 6.1 Mbps.

Exam Relevance: GCE O Level, SAT Subject Tests, AP Computer Science Principles

Difficulty: Moderate

Concept notes: 3G technology is known for its data transmission speeds, which vary based on the specific implementation and network conditions. The claimed correct answer reflects the typical maximum speed achievable under optimal conditions.

Common Mistakes: Students may confuse 3G speeds with those of 4G or 5G, which are significantly faster.

Explanations: 3G technology, or third-generation mobile telecommunications, was designed to support higher data rates for various services such as video calls and mobile internet. The maximum speed of 3G networks is generally around 6.1 Mbps under ideal conditions. This speed is sufficient for basic internet browsing, email, and some multimedia applications but is slower compared to later generations like 4G and 5G.

Option Analysis:

Option A: 15 Mbps is too high for 3G technology, which typically does not exceed 6.1 Mbps.
Option B: 25 Mbps is far beyond the capabilities of 3G networks, which are limited to around 6.1 Mbps.
Option C: 3 Mbps is within the range of 3G speeds but does not represent the maximum achievable speed.
Option D: 6.1 Mbps is the correct maximum speed for 3G technology under optimal conditions.

Mnemonic: 3G, 6.1, Max Speed

12. What does MAN stand for and what is it used for

Correct Answer: Correct answer is: (A) Is a network that spans across a large campus or a city, and it stands for metropolitan area network.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: MAN stands for Metropolitan Area Network, which is a network that covers a larger geographical area than a LAN but smaller than a WAN, typically spanning a city or large campus.

Common Mistakes: Students may confuse MAN with WAN (Wide Area Network) or LAN (Local Area Network), which cover different geographical areas.

Explanations: MAN stands for Metropolitan Area Network. It is used to connect multiple LANs within a city or large campus. This network type is designed to cover a larger geographical area than a LAN but smaller than a WAN. The term "metropolitan" indicates that the network spans a city or a large campus, making it suitable for connecting multiple smaller networks within a limited geographical area.

Option Analysis:

Option A: Correct. MAN stands for Metropolitan Area Network and is used to connect multiple LANs within a city or large campus.
Option B: Incorrect. MAN does not stand for Major Accessible Network. It stands for Metropolitan Area Network.
Option C: Incorrect. Only Option A is correct.
Option D: Incorrect. Option A is correct.

Mnemonic: MAN: Metropolitan Area Network

13. OSI is an acronym for ?

Correct Answer: Correct answer is: (A) Open Systems Interconnection.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Very Easy

Concept notes: OSI stands for Open Systems Interconnection, which is a reference model for how applications communicate over a network.

Common Mistakes: Students may confuse OSI with other acronyms that start with similar letters, such as O/S for operating system.

Explanations: OSI is an acronym for Open Systems Interconnection. This model is a conceptual framework used to describe the functions of a telecommunication or computing system without regard to its underlying internal structure and technology. It is a reference model that defines a networking system in seven layers, each with a specific function.

Option Analysis:

Option A: Correct. OSI stands for Open Systems Interconnection.
Option B: Incorrect. Operating Systems Input is not a recognized acronym.
Option C: Incorrect. Operating System Interaction is not a recognized acronym.
Option D: Incorrect. Objective Software Interface is not a recognized acronym.

14. TCP delivers..... out-of-order segments to the process.

Correct Answer: Correct answer is: (B) No.

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Easy

Concept notes: TCP (Transmission Control Protocol) ensures that data is delivered in the correct order to the receiving application.

Common Mistakes: Students may mistakenly believe that TCP does not guarantee the order of data delivery, leading them to choose an incorrect option.

Explanations: TCP is designed to ensure that segments are delivered in the correct order to the receiving application. It uses sequence numbers to reorder segments if they arrive out of order. Therefore, TCP does not deliver out-of-order segments to the process.

Option Analysis:

Option A: Incorrect because TCP does not deliver all out-of-order segments to the process.
Option B: Correct because TCP ensures that segments are delivered in the correct order.
Option C: Incorrect because TCP does not deliver some out-of-order segments to the process.
Option D: Incorrect because the correct answer is explicitly stated.

Mnemonic: TCP: "Tidy, Correct, Perfect" - Ensures order.

15. Choose the statement which is not applicable for cable internet access

Correct Answer: Correct answer is: (D) Analog signal is converted to digital signal in DSLAM.

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

Difficulty: Moderate

Concept notes: DSLAM (Digital Subscriber Line Access Multiplexer) is used in DSL (Digital Subscriber Line) technology, not in cable internet access. In cable internet, the conversion from analog to digital occurs at the cable modem, not the DSLAM.

Common Mistakes: Students may confuse DSLAM with components used in cable internet access, such as the CMTS (Cable Modem Termination System).

Explanations: DSLAM is a device used in DSL technology to convert analog signals to digital signals. However, cable internet access does not use DSLAM. Instead, it uses a CMTS to manage the data flow between the cable network and the internet. The conversion from analog to digital in cable internet happens at the cable modem, not the DSLAM.

Option Analysis:

Option A: Cable internet access is a shared broadcast medium, as multiple users share the same coaxial cable for internet access.
Option B: Cable internet access includes HFCs (Hybrid Fiber-Coaxial networks), which are used to deliver internet services to homes.
Option C: A cable modem connects a home PC to an Ethernet port, enabling internet access.
Option D: This statement is incorrect because DSLAM is not used in cable internet access. The conversion from analog to digital occurs at the cable modem, not the DSLAM.

Mnemonic: Cable Modem, Not DSLAM

16. In this type of network topology, each node of the network is connected to a central node, which is known as a hub?

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

Exam Relevance: CCNA, CompTIA Network+, A+

Difficulty: Easy

Concept notes: In a star topology, all nodes are directly connected to a central hub.

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

Explanations: In a star topology, each node is connected to a central hub. This central hub acts as a mediator for all communications. The star topology is easy to manage and troubleshoot because the failure of one node does not affect the others.

Option Analysis:

Option A: Mesh topology involves multiple connections between nodes, not a central hub.
Option B: Ring topology connects nodes in a circular configuration, not to a central hub.
Option C: Bus topology connects all nodes to a single backbone, not a central hub.
Option D: Star topology connects all nodes to a central hub, which is correct.

Mnemonic: Star = Central Hub

17. The Internet was originally developed by whom?

Correct Answer: Correct answer is: (C) The U.S. Department of Defense.

Exam Relevance: AP Computer Science Principles, SAT Subject Tests, High School History Exams

Difficulty: Easy

Concept notes: The Internet was originally developed by the U.S. Department of Defense as a means to maintain communication in the event of a nuclear attack.

Common Mistakes: Students may mistakenly believe that the Internet was developed by a corporation or university, due to the significant roles these entities play in modern Internet development.

Explanations: The Internet was initially conceived and funded by the U.S. Department of Defense through the Advanced Research Projects Agency (ARPA), which later became the Defense Advanced Research Projects Agency (DARPA). The goal was to create a robust communication network that could survive a nuclear attack. This network, known as ARPANET, was the precursor to the modern Internet.

Option Analysis:

Option A: Computer hackers did not develop the Internet. They have, however, played a role in shaping its culture and security.
Option B: A corporation did not develop the Internet. Corporations have been significant in the commercialization and expansion of the Internet, but they were not the original developers.
Option C: The U.S. Department of Defense developed the Internet as part of a military project to ensure communication resilience.
Option D: The University of Michigan did not develop the Internet. Universities have been important in the development and research of Internet technologies, but they were not the original developers.

Mnemonic: DARPA, Defense, Network

18. IANA Stands for

Correct Answer: Correct answer is: (D) Internet Assigned Number Authority.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Very Easy

Concept notes: IANA is the acronym for Internet Assigned Numbers Authority, which is responsible for the global coordination of the DNS Root, IP addressing, and other Internet protocol resources.

Common Mistakes: Students may confuse IANA with other similar-sounding acronyms or organizations.

Explanations: The correct answer is D) Internet Assigned Number Authority. IANA is the organization responsible for managing and assigning unique identifiers for various Internet protocols and resources. This includes managing the DNS root zone, IP addressing, and other critical Internet infrastructure.

Option Analysis:

Option A: Incorrect, as "Internet Assigned Node Authority" is not the correct acronym or full name for IANA.
Option B: Incorrect, as "Internet Assigned Native Authority" is not the correct acronym or full name for IANA.
Option C: Incorrect, as "Internet Aligned Number Authority" is not the correct acronym or full name for IANA.
Option D: Correct, as "Internet Assigned Number Authority" is the official name for IANA.

19. How can we examine the current routing tables in command prompt?

Correct Answer: Correct answer is: (C) Using netstat.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: The netstat command is used to display network connections, routing tables, and interface statistics.

Common Mistakes: Students may confuse netstat with other commands like route or ipconfig, which are also used for network diagnostics but serve different purposes.

Explanations: The netstat command provides a comprehensive view of the current network connections and routing tables. It is a versatile tool for network troubleshooting and monitoring. The routing table information can be specifically obtained using the netstat -r command, which lists the current routing table entries.

Option Analysis:

Option A: The routestart command does not exist in the command prompt.
Option B: The netstart command does not exist in the command prompt.
Option C: The netstat command is the correct tool for examining routing tables and network connections.
Option D: Since neither routestart nor netstart are valid commands, this option is incorrect.

20. This device is responsible for sending out WIFI (wireless) signals in your home for you to connect to.

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

Exam Relevance: Networking exams, IT certifications, Computer Science exams

Difficulty: Easy

Concept notes: A router is a device that connects multiple devices to a network and sends out wireless signals for devices to connect to the internet.

Common Mistakes: Students may confuse a router with a modem, which is responsible for connecting to the internet service provider, not for sending out wireless signals.

Explanations: A router is responsible for sending out wireless signals in a home network. It connects to a modem and distributes the internet connection to multiple devices via Wi-Fi. The router manages the network traffic and allows devices to communicate with each other and the internet.

Option Analysis:

Option A: Correct. A router sends out wireless signals for devices to connect to the internet.
Option B: Incorrect. A hub is a simple networking device that connects multiple devices but does not send out wireless signals.
Option C: Incorrect. A modem connects to the internet service provider and converts signals but does not send out wireless signals.
Option D: Incorrect. An ISP (Internet Service Provider) provides internet access but does not send out wireless signals in a home network.

Mnemonic: Routers Route Radio

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Computer networking MCQ - Set 2

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