Computer networking MCQ - Change your future

911. In the..... method, after the station finds the line idle, it sends its frame immediately. If the line is not idle, it continuously senses the line until it finds it idle.

Correct Answer: Correct answer is: (B) 1-persistent.

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Moderate

Concept notes: In the 1-persistent method, a station continuously monitors the line. If the line is found to be idle, the station sends its frame immediately. If the line is busy, the station continues to sense the line until it becomes idle.

Common Mistakes: Students often confuse 1-persistent with nonpersistent, where a station waits for a random amount of time before checking the line again.

Explanations: The 1-persistent method involves continuous monitoring of the line. Once the line is detected as idle, the station sends its frame without delay. This ensures that the station does not miss the opportunity to transmit as soon as the line becomes available.

Option Analysis:

Option A: Nonpersistent involves waiting for a random time before checking the line again, which is not the case here.
Option B: 1-persistent correctly describes the method where the station continuously senses the line and sends the frame immediately upon detecting an idle line.
Option C: P-persistent involves a probabilistic decision to transmit, which is not the behavior described in the question.
Option D: None of the above is incorrect as 1-persistent is the correct method described.

912. In communication satellite, multiple repeaters are known as

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

Exam Relevance: GATE, GRE, ESE

Difficulty: Easy

Concept notes: In communication satellites, multiple repeaters are known as transponders. Transponders are essential components that receive signals from Earth, amplify them, and retransmit them back to Earth.

Common Mistakes: Students may confuse transponders with other components like detectors or modulators, which have different functions in satellite communication systems.

Explanations: Transponders are the correct term for multiple repeaters in communication satellites. They are responsible for receiving, amplifying, and retransmitting signals. Detectors and modulators are different components that do not perform the same function as transponders.

Option Analysis:

Option A: Detectors are used to detect signals but do not amplify and retransmit them.
Option B: Modulators are used to modify signals but do not amplify and retransmit them.
Option C: Stations refer to ground stations, not the components within the satellite.
Option D: Transponders are the correct term for multiple repeaters in communication satellites.

Mnemonic: Transponders: Transmit and Respond

913. The idea of address aggregation was designed to alleviate the increase in routing table entries when using.....

Correct Answer: Correct answer is: (B) Classless addressing.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: Address aggregation, also known as CIDR (Classless Inter-Domain Routing), is a method used to reduce the size of routing tables by combining multiple IP addresses into a single routing table entry.

Common Mistakes: Students may confuse address aggregation with classful addressing, which does not support aggregation and results in larger routing tables.

Explanations: Classless addressing, specifically CIDR, allows for the aggregation of IP addresses, which helps in reducing the number of routing table entries. This is in contrast to classful addressing, which does not support such aggregation and leads to larger routing tables. Therefore, the idea of address aggregation was designed to alleviate the increase in routing table entries when using classless addressing.

Option Analysis:

Option A: Classful addressing does not support address aggregation, leading to larger routing tables.
Option B: Classless addressing supports address aggregation, which helps in reducing routing table entries.
Option C: Address aggregation is specifically designed for classless addressing, not classful addressing.
Option D: This option is incorrect as classless addressing is the correct context for address aggregation.

Mnemonic: CIDR reduces, classful increases.

914. Minimum time required to download one million bytes of information for V32 modem would be

Correct Answer: Correct answer is: (B) 834 s.

Exam Relevance: GATE, GRE, GMAT

Difficulty: Moderate

Concept notes: The correct answer is based on the data transfer rate of the V32 modem and the time required to download a specific amount of data.

Common Mistakes: Students often make the mistake of not converting the data size and transfer rate into consistent units before calculating the time.

Explanations: The V32 modem has a data transfer rate of 9600 bits per second. To find the time required to download one million bytes (1,000,000 bytes), we first convert bytes to bits (1 byte = 8 bits). Therefore, 1,000,000 bytes is equal to 8,000,000 bits. The time required to download 8,000,000 bits at a rate of 9600 bits per second is calculated as follows: \[ \text{Time} = \frac{8,000,000 \text{ bits}}{9600 \text{ bits/second}} = 833.33 \text{ seconds} \] Rounding to the nearest whole number gives 834 seconds.

Option Analysis:

Option A: 800 s. - This is incorrect as it underestimates the time required.
Option B: 834 s. - This is the correct answer as it accurately reflects the time required.
Option C: 900 s. - This is incorrect as it overestimates the time required.
Option D: 1000 s. - This is incorrect as it overestimates the time required.

Mnemonic: Bits to Bytes, Divide and Round

915. SCTP association allows..... for each end.

Correct Answer: Correct answer is: (B) Multiple IP addresses.

Exam Relevance: Computer Networks, Network Protocols, Undergraduate Exams

Difficulty: Moderate

Concept notes: SCTP (Stream Control Transmission Protocol) allows multiple IP addresses to be associated with each end of an SCTP association.

Common Mistakes: Students may mistakenly believe that SCTP only allows a single IP address per end, similar to TCP.

Explanations: SCTP is designed to support multihoming, which means it can use multiple IP addresses at each endpoint. This feature enhances reliability and load distribution. Therefore, the correct answer is that SCTP association allows multiple IP addresses for each end.

Option Analysis:

Option A: Incorrect, as SCTP supports more than one IP address per end.
Option B: Correct, SCTP supports multiple IP addresses per end.
Option C: Incorrect, as SCTP supports more than two IP addresses per end.
Option D: Incorrect, as SCTP does support multiple IP addresses per end.

Mnemonic: SCTP Multihoming: Multiple IP, More Reliable

916. A proposed network infrastructure of interconnected local, regional, and global networks that would support universal interactive multimedia communications. Select the best fit for answer:

Correct Answer: Correct answer is: (B) Information super highway.

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

Difficulty: Moderate

Concept notes: The term "Information super highway" refers to a proposed network infrastructure that would support universal interactive multimedia communications.

Common Mistakes: Students may confuse the term "Information super highway" with other network concepts like client/server networks or internetworked enterprises.

Explanations: The "Information super highway" is a concept that envisions a network infrastructure capable of supporting universal interactive multimedia communications. This aligns with the description provided in the question, which mentions interconnected local, regional, and global networks. The other options do not fit this specific vision of a comprehensive, multimedia-capable network infrastructure.

Option Analysis:

Option A: Internetworked enterprise refers to a network of interconnected networks within a business, not a universal multimedia communication network.
Option B: Information super highway is the correct term for a proposed network infrastructure supporting universal interactive multimedia communications.
Option C: Business applications of telecommunications refers to the use of telecommunications in business contexts, not a universal network infrastructure.
Option D: Client/Server networks describe a specific network architecture, not a universal multimedia communication network.

917. What is the error (if any) in the following representation-75.45.301.14?

Correct Answer: Correct answer is: (C) Each byte should be less than or equal to 255.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: An IPv4 address is composed of four bytes, each ranging from 0 to 255.

Common Mistakes: Students may overlook the byte limit and focus only on the number of bytes.

Explanations: In the given representation, 75.45.301.14, the third byte is 301, which exceeds the maximum value of 255 for an IPv4 address byte. Therefore, the correct answer is that each byte should be less than or equal to 255.

Option Analysis:

Option A: Leading zeros are not a requirement for IPv4 addresses, so this is not the error.
Option B: The address has four bytes, which is correct for an IPv4 address, so this is not the error.
Option C: The third byte, 301, exceeds the maximum value of 255, making this the correct error.
Option D: There is an error in the address, so this is not the correct answer.

918. Which of the following would you use to find information on the internet?

Correct Answer: Correct answer is: (C) Search Engine.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: A search engine is a tool used to find information on the internet by searching for keywords or phrases.

Common Mistakes: Students may mistakenly choose options like "Help menu" or "Microsoft Word" because they are familiar with these tools but do not understand their specific functions.

Explanations: A search engine is specifically designed to search for and retrieve information from the internet. It uses algorithms to index and rank web pages based on relevance to the user's query. This makes it the most appropriate tool for finding information online.

Option Analysis:

Option A: A help menu is typically found within software applications and provides assistance and guidance for using that specific application, not for searching the internet.
Option B: Microsoft Word is a word processing software used for creating and editing documents, not for searching the internet.
Option C: A search engine is the correct choice as it is designed to search for and retrieve information from the internet.
Option D: Email is a communication tool used for sending and receiving messages, not for searching the internet.

919. In..... error correction, the receiver asks the sender to send the data again.

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

Exam Relevance: Computer Networks, Data Communication, Information Theory

Difficulty: Easy

Concept notes: Retransmission error correction involves the receiver requesting the sender to resend the data when errors are detected.

Common Mistakes: Students may confuse retransmission with forward error correction, which does not involve requesting the sender to resend data.

Explanations: In retransmission error correction, the receiver detects errors in the received data and requests the sender to resend the data. This method ensures that the data is transmitted accurately by re-sending the corrupted data until it is received correctly.

Option Analysis:

Option A: Backward is not a standard term for error correction methods.
Option B: Retransmission is the correct method where the receiver asks the sender to resend the data.
Option C: Forward error correction does not involve requesting the sender to resend data.
Option D: None of the above is incorrect as retransmission is a valid method.

Mnemonic: R for Retransmission, R for Resend.

920. When the computer provides the manager with a multiple choice of possible answers, the prompting technique is

Correct Answer: Correct answer is: (B) Menu selection.

Exam Relevance: Computer Science, Information Technology, Management Information Systems

Difficulty: Easy

Concept notes: Menu selection involves providing a set of predefined options from which a user can choose. This technique is commonly used in computer systems to simplify user input and decision-making processes.

Common Mistakes: Students may confuse menu selection with form filling, which involves filling out fields with specific information rather than choosing from a list of options.

Explanations: Menu selection is the correct answer because it involves providing a set of predefined options from which the manager can choose. This matches the description of the computer providing a multiple choice of possible answers.

Option Analysis:

Option A: Form filling involves filling out fields with specific information, not choosing from a list of options.
Option B: Menu selection involves providing a set of predefined options from which the user can choose, which matches the description given.
Option C: Question and answer involves a direct response to a specific question, not choosing from a list of options.
Option D: Open-ended question allows for a free-form response, not choosing from a list of options.

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Computer networking MCQ - Set 92

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