Computer networking MCQ – Change your future

521. Which of the device below is also called a smarter hub?

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Moderate

Concept notes: A switch is a network device that connects devices on a network and forwards data to the correct destination. It is considered smarter than a hub because it can direct traffic to specific ports rather than broadcasting to all connected devices.

Common Mistakes: Students may confuse a switch with a hub, as both are used to connect devices on a network. However, a switch is more advanced and efficient in managing network traffic.

Explanations: A switch is also called a smarter hub because it can identify the destination of data packets and send them directly to the appropriate device, rather than broadcasting to all devices connected to the network. This makes the switch more efficient and reduces network congestion compared to a hub.

Option Analysis:

Option A: A hub is a basic network device that broadcasts data to all connected devices, making it less efficient than a switch.
Option B: A bridge is a device that connects two network segments, but it does not have the same level of intelligence as a switch in managing network traffic.
Option C: A switch is a network device that can direct traffic to specific ports, making it more efficient and smarter than a hub.
Option D: A router is a device that connects multiple networks and routes data between them, but it is not specifically referred to as a smarter hub.

Mnemonic: Switches are smart, hubs are dumb.

522. Barnabas whants to maximise the speed of his WiFi connection. Based on the diagram, which channel would you recommend he sets his router to?

Correct Answer: Correct answer is: (C) 4.

Exam Relevance: AP Computer Science Principles, CompTIA Network+, CCNA

Difficulty: Moderate

Concept notes: To maximize the speed of a WiFi connection, it is important to choose a channel that has minimal interference from other networks.

Common Mistakes: Students may mistakenly choose a channel that appears less crowded but is still within the range of adjacent channels, leading to interference.

Explanations: Channel 4 is recommended because it is less likely to experience interference from other channels. Channels 1, 6, and 11 are commonly used and often overlap, causing interference. By selecting channel 4, Barnabas can avoid the crowded channels and achieve a faster WiFi connection.

Option Analysis:

Option A: Channel 11 is commonly used and may experience interference from other networks.
Option B: Channel 1 is commonly used and may experience interference from other networks.
Option C: Channel 4 is less likely to experience interference from other channels, making it the best choice for maximizing WiFi speed.
Option D: Channel 3 is close to channel 1 and may experience interference from other networks.

523. In this network type, each computer can be both a server and a client. What type of network am I?

Correct Answer: Correct answer is: (B) Peer to Peer Network.

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

Difficulty: Easy

Concept notes: In a Peer to Peer Network, each computer can act as both a server and a client, sharing resources and data directly with other computers in the network.

Common Mistakes: Students may confuse Peer to Peer Networks with Client-Server Networks, where there is a dedicated server that manages all the resources and data.

Explanations: A Peer to Peer Network allows each computer to share resources and data directly with other computers, without the need for a central server. This means that each computer can act as both a server and a client, making it the correct answer.

Option Analysis:

Option A: A Wide Area Network (WAN) covers a large geographical area, such as cities or countries, and does not necessarily involve computers acting as both servers and clients.
Option B: A Peer to Peer Network allows each computer to act as both a server and a client, sharing resources directly with other computers in the network.
Option C: A Metropolitan Area Network (MAN) covers a metropolitan area, such as a city, and does not necessarily involve computers acting as both servers and clients.
Option D: A Wireless Local Area Network (WLAN) is a wireless network that covers a small area, such as a home or office, and does not necessarily involve computers acting as both servers and clients.

Mnemonic: P2P: Peer to Peer, Both Server and Client

524. Select the disadvantages of WAN:

Correct Answer: Correct answer is: (C) Spread of viruses.

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

Difficulty: Easy

Concept notes: WANs (Wide Area Networks) can have disadvantages, including the spread of viruses across a large geographical area.

Common Mistakes: Students may confuse the advantages of WANs, such as sharing peripherals and large network coverage, with disadvantages.

Explanations: The spread of viruses is a disadvantage of WANs because viruses can propagate quickly across a wide geographical area, affecting multiple systems and users. This can lead to significant security risks and disruptions in network operations.

Option Analysis:

Option A: Sharing peripherals is an advantage of WANs, not a disadvantage.
Option B: Large network coverage is an advantage of WANs, not a disadvantage.
Option C: The spread of viruses is a disadvantage of WANs, as it can cause significant security risks and disruptions.

Mnemonic: Virus Spread = WAN Worry

525. The purpose of a SWITCH is....

Correct Answer: Correct answer is: (B) To enable devices on a network to connect with each other and send/receive data.

Exam Relevance: CCNA, CompTIA Network+, ITIL Foundation

Difficulty: Easy

Concept notes: A switch is a networking device that connects multiple devices on a network and facilitates communication between them.

Common Mistakes: Students may confuse a switch with a router, which connects different networks, or a modem, which connects to the internet.

Explanations: A switch operates at the data link layer of the OSI model and uses MAC addresses to direct data packets to the correct device on the network. This allows devices to communicate directly with each other without the need for a central hub, improving network efficiency and reducing collisions.

Option Analysis:

Option A: Incorrect, as a switch does not connect a computer to the internet; a modem or router is used for that purpose.
Option B: Correct, as a switch enables devices on a network to connect and communicate with each other.
Option C: Incorrect, as connecting one network to another is the function of a router, not a switch.
Option D: Incorrect, as supporting wireless networking is typically the function of a wireless access point or router, not a switch.

Mnemonic: Switch = Switching data between devices

526. Lucy posts a music file on the Internet so people can download it. Why should she compress it?

Correct Answer: Correct answer is: (A) Less bytes in the file so it downloads faster.

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

Difficulty: Easy

Concept notes: Compression reduces the size of a file, making it quicker to download.

Common Mistakes: Students may think that compression is primarily for security or to prevent illegal downloads.

Explanations: Compression reduces the file size by encoding the data more efficiently. This results in fewer bytes, which means the file will download faster. The other options are incorrect because compression does not inherently increase security, prevent illegal downloads, or prevent copying.

Option Analysis:

Option A: Correct. Compression reduces the file size, leading to faster downloads.
Option B: Incorrect. Compression does not make the file more secure or prevent malware.
Option C: Incorrect. Compression does not prevent illegal downloads.
Option D: Incorrect. Compression does not prevent copying of the file.

527. How far can Wi-fi reach?

Correct Answer: Correct answer is: (B) Around 70 meters.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Moderate

Concept notes: Wi-Fi range can vary based on the type of Wi-Fi standard and environmental factors, but a typical range for a standard Wi-Fi router is around 70 meters indoors and up to 100 meters outdoors.

Common Mistakes: Students may confuse the range of Wi-Fi with other wireless technologies or may underestimate the impact of environmental factors on Wi-Fi range.

Explanations: Wi-Fi range is influenced by the Wi-Fi standard, environmental conditions, and obstacles. A typical Wi-Fi router using the 2.4 GHz band can reach up to around 70 meters indoors. This range can be extended outdoors but is reduced by walls, furniture, and other physical barriers. Therefore, the correct answer is around 70 meters.

Option Analysis:

Option A: This option underestimates the typical range of a Wi-Fi router.
Option B: This option correctly reflects the typical indoor range of a Wi-Fi router.
Option C: This option significantly underestimates the typical range of a Wi-Fi router.
Option D: This option overestimates the typical indoor range of a Wi-Fi router.

Mnemonic: 70 meters, Wi-Fi's typical reach.

528. What forwards data packets to the right computer?

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

Exam Relevance: CCNA, CompTIA Network+, AP Computer Science Principles

Difficulty: Easy

Concept notes: A router is a device that forwards data packets between computer networks.

Common Mistakes: Students may confuse the function of a router with that of an Ethernet cable, which only transmits data within a local network.

Explanations: A router is responsible for directing data packets to the correct destination on a network. It examines the destination address of each packet and forwards it to the appropriate network segment or device. This function is essential for connecting different networks and ensuring that data reaches the intended recipient.

Option Analysis:

Option A: Correct. A router forwards data packets to the right computer.
Option B: Incorrect. The Internet is a global network of networks, not a device that forwards data packets.
Option C: Incorrect. An Ethernet cable is used to physically connect devices within a local network but does not forward data packets.
Option D: Incorrect. A clock is a device that measures time and has no function in forwarding data packets.

Mnemonic: Routers Route, Others Don't

529. Compared to wired networks, how do wireless networks perform?

Correct Answer: Correct answer is: (C) Slower - radio waves can be interfered with.

Exam Relevance: Computer Networks, Telecommunications, Information Technology

Difficulty: Moderate

Concept notes: Wireless networks can be slower than wired networks due to interference and signal degradation.

Common Mistakes: Students may mistakenly believe that wireless networks are faster due to the absence of physical cables.

Explanations: Wireless networks use radio waves to transmit data, which can be subject to interference from various sources such as other electronic devices, physical obstacles, and environmental factors. This interference can lead to signal degradation and slower data transmission rates. In contrast, wired networks use physical cables that are less susceptible to such interference, resulting in generally faster and more reliable data transmission.

Option Analysis:

Option A: This option is incorrect because wireless networks are not necessarily cheaper. The cost can vary based on the technology and infrastructure required.
Option B: This option is incorrect because the speed of radio waves is not the determining factor for network performance. Interference and signal strength are more critical.
Option C: This option is correct because wireless networks can be slower due to interference with radio waves.
Option D: This option is incorrect because while wireless networks can have a larger range, this does not directly address the speed of data transmission.

530. Which of these is NOT hardware used to create a network?

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

Exam Relevance: AP Computer Science Principles, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: SSD stands for Solid State Drive, which is a type of storage device used to store data. It is not a networking device.

Common Mistakes: Students may confuse SSD with other hardware components that are used in networking, such as switches or hubs.

Explanations: SSD is a storage device used to store data on a computer. It is not used to create a network. Hubs, wireless access points, and switches are all hardware components used to create and manage network connections.

Option Analysis:

Option A: A hub is a networking device that connects multiple devices on a network.
Option B: An SSD is a storage device, not a networking device.
Option C: A wireless access point is a networking device that allows wireless devices to connect to a network.
Option D: A switch is a networking device that connects devices on a network and manages data flow.

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Computer networking MCQ - Set 53

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