Computer networking MCQ – Change your future

191. Find the number of addresses in a block of classless addresses if one of the addresses is 12.2.2.7/24.

Correct Answer: Correct answer is: (C) 256.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The correct answer is based on the understanding of classless addressing and subnet masks.

Common Mistakes: Students often confuse the number of addresses with the number of usable addresses, not considering the full range of the subnet.

Explanations: The address 12.2.2.7/24 indicates a subnet mask of 255.255.255.0, which means the last octet is used for host addresses. A /24 subnet mask allows for 2^8 = 256 possible addresses in the block.

Option Analysis:

Option A: 32 is incorrect because it would imply a /27 subnet mask, which is not the case here.
Option B: 64 is incorrect because it would imply a /26 subnet mask, which is not the case here.
Option C: 256 is correct because a /24 subnet mask allows for 256 addresses in the block.
Option D: None of the above is incorrect because 256 is a valid and correct answer.

192. This device that changes computer network signals so they can travel along phone or cable lines to the internet.

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

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

Difficulty: Easy

Concept notes: A modem is a device that modulates and demodulates signals to enable data transmission over analog communication lines such as telephone or cable lines.

Common Mistakes: Students may confuse a modem with a router, as both are essential for internet connectivity, but they serve different functions.

Explanations: A modem is the correct answer because it is specifically designed to convert digital signals from a computer into analog signals that can travel over phone or cable lines. This conversion is necessary for the data to be transmitted to and from the internet.

Option Analysis:

Option A: A router is a device that directs data traffic between networks, but it does not convert signals for transmission over analog lines.
Option B: A modem is the correct answer because it converts digital signals into analog signals for transmission over phone or cable lines.
Option C: A printer is a device that prints text and images from a computer, and it does not handle signal conversion for internet transmission.
Option D: An Ethernet cable is a physical cable used to connect devices on a local network, but it does not convert signals for transmission over analog lines.

Mnemonic: Modem: Modulate, Demodulate

193. In a banyan switch, for 8 inputs and 8 outputs, we have..... microswitches at each stage.

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

Exam Relevance: Computer Networks, Data Communication, Telecommunication Engineering

Difficulty: Moderate

Concept notes: In a banyan switch, the number of microswitches at each stage is determined by the logarithm base 2 of the number of inputs or outputs. For 8 inputs and 8 outputs, the number of stages is log2(8) = 3. Each stage has half the number of inputs, so each stage has 8/2 = 4 microswitches.

Common Mistakes: Students may confuse the number of microswitches with the number of inputs or outputs, leading to incorrect answers.

Explanations: A banyan switch with 8 inputs and 8 outputs has 3 stages. Each stage has 4 microswitches because the number of microswitches at each stage is half the number of inputs. Therefore, the correct number of microswitches at each stage is 4.

Option Analysis:

Option A: 8 is incorrect because it is the total number of inputs or outputs, not the number of microswitches per stage.
Option B: 4 is correct because each stage in a banyan switch with 8 inputs and 8 outputs has 4 microswitches.
Option C: 3 is incorrect because it represents the number of stages, not the number of microswitches per stage.
Option D: 2 is incorrect because it is half the number of microswitches per stage, not the actual number.

194. In 10Base2, cable is

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Easy

Concept notes: 10Base2 is a type of Ethernet network that uses thin coaxial cable.

Common Mistakes: Students may confuse 10Base2 with 10Base5, which uses thick coaxial cable.

Explanations: 10Base2, also known as "thinnet," uses thin coaxial cable. The "2" in 10Base2 refers to the maximum cable length of 185 meters (approximately 200 meters). This type of cable is thinner and more flexible than the thick coaxial cable used in 10Base5, making it easier to install in smaller networks.

Option Analysis:

Option A: Incorrect, as 10Base2 uses thin coaxial cable, not thick.
Option B: Correct, as 10Base2 uses thin coaxial cable.
Option C: Incorrect, as twisted pair is used in other Ethernet standards like 10BaseT.
Option D: Incorrect, as thin coaxial cable is the correct type for 10Base2.

Mnemonic: ThinNet, Thin Cable, Thin 2

195. Each computer on the network is called a

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

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

Difficulty: Easy

Concept notes: A workstation is a computer that is connected to a network and used by a single user.

Common Mistakes: Students may confuse a workstation with a server, which is a computer that provides services to other computers on the network.

Explanations: A workstation is a computer on a network that is used by a single user. It is designed to support the work of an individual and is connected to a network to share resources and communicate with other computers. This makes it the correct term for a computer on a network.

Option Analysis:

Option A: Correct. A workstation is a computer on a network used by a single user.
Option B: Incorrect. Desktop refers to a type of computer, not its role on a network.
Option C: Incorrect. A hub is a networking device, not a computer on the network.
Option D: Incorrect. A server is a computer that provides services to other computers on the network, not a general term for a computer on the network.

Mnemonic: W - Workstation, W - Work, S - Single user

196. In IPv6, ..... address defines a group of computers.

Correct Answer: Correct answer is: (B) A multicast.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: In IPv6, a multicast address defines a group of computers.

Common Mistakes: Students may confuse multicast with unicast, which refers to a single destination address.

Explanations: A multicast address in IPv6 is used to send packets to a group of computers. This is different from unicast, which sends packets to a single computer, and anycast, which sends packets to the nearest computer in a group. Multicast is designed for efficient communication with multiple recipients, making it suitable for applications like video conferencing and streaming.

Option Analysis:

Option A: A unicast address is used for one-to-one communication, not for defining a group of computers.
Option B: A multicast address is used for one-to-many communication, defining a group of computers.
Option C: An anycast address is used for one-to-nearest communication, not for defining a group of computers.
Option D: This option is incorrect as multicast is the correct answer.

197. The probability of the error in a transmitted block..... with the length of the block

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

Exam Relevance: GATE, GRE, ECE Competitive Exams

Difficulty: Moderate

Concept notes: In digital communication, the probability of error in a transmitted block generally increases with the length of the block due to the accumulation of errors over a longer transmission period.

Common Mistakes: Students may incorrectly assume that the error probability remains constant or decreases with block length, not considering the cumulative effect of errors over time.

Explanations: The probability of error in a transmitted block increases with the length of the block because longer blocks have more opportunities for errors to occur. As the block length increases, the likelihood of encountering noise, interference, or other transmission impairments also increases, leading to a higher probability of error. This is a fundamental concept in digital communication theory.

Option Analysis:

Option A: This option is incorrect because the probability of error does not remain constant as the block length increases.
Option B: This option is incorrect because the probability of error does not decrease as the block length increases.
Option C: This option is correct because the probability of error increases with the length of the block due to the cumulative effect of errors over a longer transmission period.
Option D: This option is incorrect because there is a clear relationship between block length and error probability.

198. Packets of the same session may be routed through different paths in

Correct Answer: Correct answer is: (B) TCP and UDP.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: Packets of the same session can be routed through different paths in both TCP and UDP due to the nature of the Internet Protocol (IP) routing.

Common Mistakes: Students may mistakenly believe that TCP ensures packets follow the same path due to its connection-oriented nature, but this is not the case as routing decisions are made independently for each packet.

Explanations: In both TCP and UDP, packets of the same session can be routed through different paths due to the underlying IP routing mechanisms. IP routing is connectionless, meaning each packet is treated independently and can be routed through different paths based on network conditions. This is true regardless of whether the transport protocol is TCP or UDP. TCP and UDP are both built on top of IP, and while TCP provides reliability and ordered delivery, it does not control the routing of individual packets.

Option Analysis:

Option A: Incorrect because packets of the same session can be routed through different paths in both TCP and UDP.
Option B: Correct because packets of the same session can be routed through different paths in both TCP and UDP.
Option C: Incorrect because packets of the same session can be routed through different paths in both TCP and UDP.
Option D: Incorrect because packets of the same session can be routed through different paths in both TCP and UDP.

199. Why probe packets are transmitted in the network?

Correct Answer: Correct answer is: (D) To know about the congestion.

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Moderate

Concept notes: Probe packets are used to monitor network conditions, particularly congestion.

Common Mistakes: Students may confuse probe packets with other types of network packets, such as those used for capacity testing or host enumeration.

Explanations: Probe packets are sent to gather information about the current state of the network, including congestion levels. By analyzing the response times and packet loss, network administrators can determine if the network is experiencing congestion. This information is crucial for maintaining network performance and reliability.

Option Analysis:

Option A: Probe packets are not primarily used to determine the capacity of the channel. Channel capacity is typically determined through other means, such as bandwidth testing.
Option B: Counting the number of hosts in a network is not the primary purpose of probe packets. This task is usually performed by network scanning or discovery protocols.
Option C: While probe packets can indirectly provide information about routing efficiency, their primary purpose is not to evaluate the routing algorithm itself.
Option D: The correct answer. Probe packets are used to detect congestion by monitoring packet loss and response times.

200. We usually want to have printers available anytime we might need them. It would be ideal if you can have access to your printer without having to bring your laptop or flash drive to the computer client near printer.

Correct Answer: Correct answer is: (C) Sharing of Printers and Peripherals.

Exam Relevance: CompTIA A+, Network+, CCNA

Difficulty: Moderate

Concept notes: Sharing of Printers and Peripherals allows multiple devices to access a single printer over a network, enhancing convenience and efficiency.

Common Mistakes: Students may confuse this with file sharing, which is a different network function.

Explanations: Sharing of Printers and Peripherals enables users to access a printer from any device on the network without needing to physically connect to the printer. This feature is ideal for environments where multiple users need to print documents from different devices, such as laptops or desktops, without the need for physical proximity to the printer. This aligns with the scenario described in the question, where the goal is to have access to a printer without having to bring a laptop or flash drive to a specific computer client.

Option Analysis:

Option A: File Sharing is the process of sharing files between multiple users on a network, which does not directly address the need for printer access.
Option B: Network Files refers to files stored on a network, which is not directly related to printer access.
Option C: Sharing of Printers and Peripherals is the correct answer as it allows multiple devices to access a printer over a network.
Option D: Sharing of Internet Connection is about sharing an internet connection among multiple devices, which is unrelated to printer access.

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Computer networking MCQ - Set 20

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