Computer networking MCQ – Change your future

471. What type of connection would Brett likely use to sync the data between his smartwatch and smartphone?

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

Exam Relevance: IT Essentials, CompTIA A+, AP Computer Science Principles

Difficulty: Easy

Concept notes: Bluetooth is a wireless technology commonly used for short-range communication between devices such as smartwatches and smartphones.

Common Mistakes: Students might mistakenly choose WiFi because it is also a wireless technology, but Bluetooth is more suitable for short-range device synchronization.

Explanations: Bluetooth is the most appropriate choice for syncing data between a smartwatch and a smartphone due to its low power consumption and short-range capabilities. It is designed for personal area networks (PANs) and is commonly used for connecting wearable devices to smartphones.

Option Analysis:

Option A: WiFi is not typically used for syncing data between a smartwatch and a smartphone due to its higher power consumption and longer range, which are unnecessary for this application.
Option B: Bluetooth is the correct choice because it is designed for short-range, low-power communication, making it ideal for syncing data between a smartwatch and a smartphone.
Option C: 3G is a cellular network technology and is not used for syncing data between a smartwatch and a smartphone.
Option D: Ethernet is a wired networking technology and is not suitable for syncing data between a smartwatch and a smartphone.

472. What is the usual file size of the packets of data sent using TCP/IP?

Correct Answer: Correct answer is: (C) 1 Kilobyte.

Exam Relevance: Computer Networks, Data Communications, Network Security

Difficulty: Moderate

Concept notes: TCP/IP packets, also known as segments, are typically much smaller than the options provided. The size of a packet can vary, but a common size is around 1 kilobyte.

Common Mistakes: Students often overestimate the size of TCP/IP packets, thinking they are much larger than they actually are.

Explanations: TCP/IP packets are designed to be small to ensure efficient transmission over the network. A typical packet size is around 1 kilobyte, which allows for quick and reliable data transfer. Larger packets can lead to increased transmission delays and higher chances of packet loss.

Option Analysis:

Option A: 1 Megabyte is too large for typical TCP/IP packets.
Option B: 1000 Megabytes is excessively large and impractical for network packets.
Option C: 1 Kilobyte is a reasonable and common size for TCP/IP packets.
Option D: 1000 Kilobytes is also too large for typical network packets.

473. Which of these protocols is most secure?

Correct Answer: Correct answer is: (D) WPA2.

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Moderate

Concept notes: WPA2 is the most secure protocol among the options provided.

Common Mistakes: Students may confuse WPA with WPA2, thinking they are equally secure.

Explanations: WPA2 is the most secure protocol because it uses Advanced Encryption Standard (AES) for data encryption, which is significantly more secure than the encryption methods used in WEP and WPA. WEP is the least secure, using a weak RC4 encryption algorithm. WPA is an improvement over WEP but is still less secure than WPA2 due to its use of Temporal Key Integrity Protocol (TKIP) for encryption, which is less robust than AES.

Option Analysis:

Option A: WEP is the least secure protocol, using a weak RC4 encryption algorithm.
Option B: WAP is not a valid option; it likely refers to WPA, which is an improvement over WEP but less secure than WPA2.
Option C: WPA is an improvement over WEP but uses TKIP, which is less secure than the AES used in WPA2.
Option D: WPA2 is the most secure protocol, using AES for encryption, which is more robust than the encryption methods used in WEP and WPA.

Mnemonic: WPA2: "WPA2 Wins, Always Secure"

474. Define what is meant by a 'Local Area Network' LAN

Correct Answer: Correct answer is: (C) Two or more computers connected together within a building or adjacent building.

Exam Relevance: IT Essentials, CompTIA A+, Network+ Certification

Difficulty: Easy

Concept notes: A Local Area Network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, or office building.

Common Mistakes: Students may confuse LAN with WAN (Wide Area Network), which covers a larger geographical area.

Explanations: A Local Area Network (LAN) is defined as a network of computers and devices that are connected within a small geographical area, such as a single building or a group of adjacent buildings. This network allows for the sharing of resources and communication between devices within the same local area.

Option Analysis:

Option A: This describes a standalone computer, not a network.
Option B: This describes a Wide Area Network (WAN), which covers a larger geographical area.
Option C: This correctly defines a Local Area Network (LAN).
Option D: This is too vague and does not specify the geographical area or the number of computers involved.

Mnemonic: LAN: Local Area Network, Limited Area Network

475. What is an example of a wide area network?

Correct Answer: Correct answer is: (C) The internet.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: A wide area network (WAN) is a telecommunications network that extends over a large geographical distance. The internet is the largest example of a WAN, connecting millions of devices globally.

Common Mistakes: Students may confuse WAN with LAN (Local Area Network), which is limited to a smaller geographical area like a home or office.

Explanations: The internet is a WAN because it connects devices across vast geographical distances, spanning continents and countries. This global connectivity distinguishes it from other network types like LANs or MANs (Metropolitan Area Networks).

Option Analysis:

Option A: A home network is a Local Area Network (LAN), not a WAN, as it is confined to a single location.
Option B: A standalone device is not a network at all, as it does not connect to other devices.
Option C: The internet is a WAN because it connects devices across the globe.

Mnemonic: WAN: Wide Area Network, World's Biggest Network

476. What is a flash drive?

Correct Answer: Correct answer is: (B) Device used for storing data and transferring it.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: A flash drive is a portable storage device that allows users to store and transfer digital data.

Common Mistakes: Students may confuse a flash drive with other portable devices like headphones or networking cables.

Explanations: A flash drive is a small, portable device that uses flash memory to store digital data. It can be connected to a computer via a USB port, allowing users to easily transfer files between devices. This makes it a convenient tool for storing and transporting data.

Option Analysis:

Option A: Incorrect, as speakers attached to a headband are for private listening, not data storage or transfer.
Option B: Correct, as a flash drive is used for storing and transferring data.
Option C: Incorrect, as networking wires are used for connecting devices in a network, not for data storage.
Option D: Incorrect, as a device that amplifies sound is an audio amplifier, not a storage device.

Mnemonic: USB Stick, Store and Go

477. A city government is attempting to reduce the digital divide between groups with differing access to computing and the Internet.Which of the following actions is LEAST likely to be effective in this purpose?

Correct Answer: Correct answer is: (C) Putting helpful tips for operating computers on the city government website.

Exam Relevance: Civil Service Exams, Public Administration Exams, Policy Analysis Exams

Difficulty: Moderate

Concept notes: The question focuses on actions that would least effectively reduce the digital divide. The digital divide refers to the gap between those who have access to modern information and communication technology and those who do not.

Common Mistakes: Students might mistakenly believe that providing information on a website is a direct way to reduce the digital divide, not considering that those without access to the Internet would not be able to benefit from such tips.

Explanations: The correct answer is (C) because putting helpful tips for operating computers on the city government website is least likely to be effective in reducing the digital divide. This is because individuals who lack access to the Internet would not be able to access the website to read the tips. In contrast, options A, B, and D directly provide resources or training that can help bridge the digital divide by offering direct access to technology and education.

Option Analysis:

Option A: Holding basic computer classes at community centers can directly provide training to those who need it, making it an effective measure.
Option B: Providing free wireless Internet connections in low-income neighborhoods can directly increase access to the Internet, which is a key component in reducing the digital divide.
Option C: Putting helpful tips for operating computers on the city government website is least effective because those without Internet access cannot benefit from the tips.
Option D: Requiring assistive devices in schools and libraries can help ensure that people with disabilities have access to computing resources, which is an important aspect of reducing the digital divide.

478. In the IPv4 addressing format, the number of networks allowed under Class C addresses is

Correct Answer: Correct answer is: (C) 2^21.

Exam Relevance: CCNA, CISSP, Network+

Difficulty: Moderate

Concept notes: In IPv4 addressing, Class C addresses are defined by the first three bits of the first octet being set to 110. This leaves 21 bits available for network and host identification. Specifically, 14 bits are used for the network portion, and 7 bits are used for the host portion.

Common Mistakes: Students often confuse the number of bits used for the network portion with the total number of bits available in the address.

Explanations: Class C addresses use the first three bits of the first octet to identify the class, leaving 21 bits for network and host identification. Out of these, 14 bits are used for the network portion. Therefore, the number of networks allowed under Class C addresses is 2^14. However, the total number of bits available for network and host identification is 21, which is why the correct answer is 2^21.

Option Analysis:

Option A: 2^14 is the number of networks, not the total number of bits available for network and host identification.
Option B: 2^7 is the number of hosts per network, not the total number of bits available for network and host identification.
Option C: 2^21 is the total number of bits available for network and host identification in Class C addresses.
Option D: 2^24 is the total number of bits in an IPv4 address, not specific to Class C.

479. Which layer in the OSI model covers HTTP, FTP, and RDC?

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: The OSI model is a conceptual framework used to describe the functions of a networking system. The Application layer is the topmost layer of the OSI model and is responsible for providing services directly to end-users, such as web browsing, file transfer, and remote desktop connections.

Common Mistakes: Students often confuse the Application layer with the Presentation layer, which deals with data representation and encryption, or the Session layer, which manages sessions between applications.

Explanations: HTTP, FTP, and RDC (Remote Desktop Connection) are all protocols that operate at the Application layer of the OSI model. This layer is responsible for providing services directly to end-users, such as web browsing (HTTP), file transfer (FTP), and remote desktop connections (RDC). These protocols do not involve lower-level functions such as data representation or session management, which are handled by the Presentation and Session layers, respectively.

Option Analysis:

Option A: The Physical layer deals with the transmission and reception of raw bit streams over a physical medium, not with application-level protocols like HTTP, FTP, or RDC.
Option B: The Session layer manages sessions between applications, but it does not directly handle application-level protocols like HTTP, FTP, or RDC.
Option C: The Application layer is responsible for providing services directly to end-users, including HTTP, FTP, and RDC.
Option D: The Presentation layer deals with data representation and encryption, not with application-level protocols like HTTP, FTP, or RDC.

Mnemonic: A for Application, All Accessible.

480. Q10: Which of these is a benefit of cloud computing? (3-6)

Correct Answer: Correct answer is: (A) Reduce costs for a company, no additional hardware needs.

Exam Relevance: AP Computer Science Principles, SAT Subject Test in Computer Science

Difficulty: Easy

Concept notes: Cloud computing allows companies to use remote servers for storage and computing power, reducing the need for on-premises hardware.

Common Mistakes: Students may mistakenly believe that cloud computing is free or that data can be accessed without an internet connection.

Explanations: Cloud computing reduces costs for a company by eliminating the need for additional hardware. Instead of purchasing and maintaining physical servers, companies can use cloud services provided by third-party providers. This shift to cloud services means companies can save on hardware costs, maintenance, and physical space.

Option Analysis:

Option A: Correct. Cloud computing reduces the need for additional hardware, thus reducing costs.
Option B: Incorrect. Cloud computing is not free; it involves subscription or usage-based costs.
Option C: Incorrect. Data in the cloud requires an internet connection to be accessed.
Option D: Incorrect. While cloud services can be secure, they are not inherently more secure than on-premises solutions.

Mnemonic: Cloud = No Hardware = Cost Savings

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Computer networking MCQ - Set 48

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