Computer networking MCQ – Change your future

331. Wireless LANs implement security measures in the

Correct Answer: Correct answer is: (B) Data Link Layers.

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Moderate

Concept notes: Wireless LANs implement security measures at the Data Link Layer to ensure secure communication between devices within the network.

Common Mistakes: Students may mistakenly believe that security measures are implemented at higher layers like the Application Layer, overlooking the foundational role of the Data Link Layer in securing wireless communications.

Explanations: Wireless LANs use the Data Link Layer to implement security measures such as encryption, authentication, and access control. These measures are crucial for protecting the integrity and confidentiality of data transmitted over the wireless medium. The Data Link Layer is responsible for establishing and maintaining the link between devices, making it an essential layer for implementing security protocols.

Option Analysis:

Option A: The Session Layer is not responsible for implementing security measures in Wireless LANs. It deals with session management between applications.
Option B: The Data Link Layer is the correct layer for implementing security measures in Wireless LANs, as it handles the physical transmission of data and ensures secure communication.
Option C: Sub Layers is not a standard term in the OSI model and does not apply to the context of security measures in Wireless LANs.
Option D: The Application Layer is the highest layer in the OSI model and is not responsible for implementing security measures in Wireless LANs. It deals with user applications and services.

Mnemonic: Data Link, Secure Link

332. In Cryptography, when text is treated at bit level, each character is replaced by

Correct Answer: Correct answer is: (C) 8 Bits.

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Easy

Concept notes: In cryptography, each character is typically represented by 8 bits, which is equivalent to one byte.

Common Mistakes: Students may confuse the number of bits used for character representation with other common bit sizes, such as 4 bits (a nibble) or 6 bits.

Explanations: In cryptography, text is often treated at the bit level, where each character is encoded using 8 bits. This is because the standard ASCII character set uses 8 bits to represent each character, allowing for 256 different characters. Therefore, the correct answer is 8 bits.

Option Analysis:

Option A: 4 bits is insufficient to represent the full range of ASCII characters.
Option B: 6 bits is also insufficient to represent the full range of ASCII characters.
Option C: 8 bits is the standard bit size for representing each character in ASCII encoding.
Option D: 10 bits is more than necessary for standard ASCII encoding.

333. 10 is a valid IP address.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: An IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. A valid IP address consists of four numbers separated by dots, with each number ranging from 0 to 255.

Common Mistakes: Students may mistakenly believe that any number can be an IP address without considering the specific format and range requirements.

Explanations: The number 10 does not meet the criteria for a valid IP address. A valid IP address must consist of four numbers separated by dots, with each number ranging from 0 to 255. For example, 192.168.1.10 is a valid IP address, but 10 alone is not.

Option Analysis:

Option A: Incorrect because 10 is not a valid IP address.
Option B: Correct because 10 does not meet the criteria for a valid IP address.
Option C: Incorrect because both options cannot be true simultaneously.
Option D: Incorrect because the validity of the IP address can be determined.

334. In Sonet Network, data is sent over working line until it fails, is

Correct Answer: Correct answer is: (B) One-to-One APS.

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

Difficulty: Moderate

Concept notes: In a Sonet Network, One-to-One APS (Automatic Protection Switching) ensures that data is continuously sent over a working line until it fails, at which point the data is automatically switched to a dedicated protection line.

Common Mistakes: Students often confuse One-to-One APS with One-Plus-One APS, where the data is simultaneously sent over both the working and protection lines.

Explanations: One-to-One APS in a Sonet Network means that data is sent over a single working line. When the working line fails, the data is automatically switched to a dedicated protection line. This ensures continuous data transmission without interruption. The protection line is not used until the working line fails, which is why it is called One-to-One APS.

Option Analysis:

Option A: One-Plus-One APS involves sending data over both the working and protection lines simultaneously, which is not the case here.
Option B: One-to-One APS is the correct choice as it describes the scenario where data is sent over a single working line until it fails, then switched to a dedicated protection line.
Option C: One-to-Many APS is not applicable here as it involves multiple protection lines, which is not the case in the given scenario.
Option D: Both A & B is incorrect because One-Plus-One APS and One-to-One APS are different mechanisms and cannot be both correct in this context.

Mnemonic: One-to-One: One line works, one stands by.

335. ..... control refers to a set of procedures used to restrict the amount of data that the sender can send before waiting for acknowledgment.

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

Exam Relevance: Computer Networks, Data Communication, Network Security

Difficulty: Moderate

Concept notes: Flow control is a mechanism used in data communication to prevent the sender from overwhelming the receiver with too much data.

Common Mistakes: Students may confuse flow control with error control, which focuses on detecting and correcting errors rather than managing the rate of data transmission.

Explanations: Flow control restricts the amount of data the sender can transmit before waiting for an acknowledgment from the receiver. This ensures that the receiver is not overwhelmed with data it cannot process immediately. The correct answer is flow control because it directly addresses the management of data transmission rates.

Option Analysis:

Option A: Correct. Flow control manages the rate of data transmission to prevent overwhelming the receiver.
Option B: Incorrect. Error control deals with detecting and correcting errors in data transmission, not managing the rate of data transmission.
Option C: Incorrect. Transmission control is a broader term that includes both flow control and error control, but does not specifically refer to managing the rate of data transmission.
Option D: Incorrect. This option is not applicable as flow control is the correct term for managing the rate of data transmission.

Mnemonic: Flow control: "Flow like a river, not a flood."

336. Which of the following functions does UDP perform?

Correct Answer: Correct answer is: (A) Process-to-process communication.

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Easy

Concept notes: UDP (User Datagram Protocol) is a transport layer protocol that provides a connectionless service for sending datagrams from a process on one computer to a process on another computer.

Common Mistakes: Students may confuse UDP with TCP, which provides end-to-end reliable data delivery, or with IP, which provides host-to-host communication.

Explanations: UDP is designed for process-to-process communication, meaning it allows applications running on different hosts to communicate directly with each other. It does not provide reliability or flow control, which are features of TCP. Therefore, UDP is suitable for applications that require fast delivery of data, even if some packets may be lost.

Option Analysis:

Option A: Correct. UDP is used for process-to-process communication.
Option B: Incorrect. Host-to-host communication is typically handled by the IP protocol, not UDP.
Option C: Incorrect. End-to-end reliable data delivery is a feature of TCP, not UDP.
Option D: Incorrect. Since Option A is correct, this option is not applicable.

337. Term that refers to time in which Request to Send (RTS) and Clear to Send (CTS) control frames are in transition is called

Correct Answer: Correct answer is: (A) Hand shaking period.

Exam Relevance: Computer Networks, Wireless Communication, Network Protocols

Difficulty: Moderate

Concept notes: The term "hand shaking period" refers to the time during which control frames such as Request to Send (RTS) and Clear to Send (CTS) are in transition. This period is crucial for establishing communication between devices in a network.

Common Mistakes: Students often confuse the hand shaking period with back-off time, which is a different concept related to collision avoidance.

Explanations: The hand shaking period is the time during which the RTS and CTS frames are exchanged between devices to establish a communication link. This period ensures that the devices are synchronized and ready to transmit data frames. The RTS and CTS frames are control frames used in wireless networks to manage access to the medium and prevent collisions.

Option Analysis:

Option A: Correct. The hand shaking period is the time during which RTS and CTS frames are in transition.
Option B: Incorrect. Back-off time is the period during which a device waits before attempting to retransmit a frame after a collision.
Option C: Incorrect. Frame exchange timeline is not a standard term used in this context.
Option D: Incorrect. Timeline is a general term and does not specifically refer to the RTS and CTS transition period.

Mnemonic: RTS-CTS handshake, like a handshake before a conversation.

338. What is a Port?

Correct Answer: Correct answer is: (A) An address that can be tied to a specific piece of software, allows the server to communicate using more than one application.

Exam Relevance: CISSP, CCNA, CompTIA Network+

Difficulty: Moderate

Concept notes: A port is a virtual address that allows a server to communicate with multiple applications simultaneously.

Common Mistakes: Students often confuse ports with physical network interfaces or storage locations for data packets.

Explanations: A port is a logical address that is associated with a specific application or service. It enables a server to handle multiple applications by assigning each a unique port number. This allows the server to manage different types of network traffic and applications independently.

Option Analysis:

Option A: Correct. A port is an address tied to specific software, enabling the server to manage multiple applications.
Option B: Incorrect. This describes a buffer or queue, not a port.
Option C: Incorrect. This describes a network application or protocol, not a port.
Option D: Incorrect. This describes a firewall or security mechanism, not a port.

Mnemonic: Port: P for Program, O for Open, R for Running

339. Most popular modems available are based on the.....standards.

Correct Answer: Correct answer is: (A) V-series.

Exam Relevance: CCNA, CompTIA Network+, CEH

Difficulty: Easy

Concept notes: The V-series standards are widely recognized for modem communication protocols.

Common Mistakes: Students may confuse the V-series with the X-series, which are also related to communication standards but not specifically for modems.

Explanations: The V-series standards, such as V.22, V.34, and V.90, are specifically designed for modem communication. These standards define the protocols and specifications for data transmission over telephone lines. The X-series, on the other hand, refers to a different set of standards that are not primarily focused on modems.

Option Analysis:

Option A: Correct. V-series standards are the most popular for modem communication.
Option B: Incorrect. X-series standards are not primarily for modems.
Option C: Incorrect. VX-series is not a recognized standard for modems.
Option D: Incorrect. The correct answer is within the given options.

Mnemonic: V for Voice, X for Exchange

340. Bit stuffing refers to

Correct Answer: Correct answer is: (A) Inserting a '0' in user stream to differentiate it with a lag.

Exam Relevance: Computer Networks, Data Communication, Network Security

Difficulty: Moderate

Concept notes: Bit stuffing is a technique used in data communication to ensure that data streams do not contain patterns that could be mistaken for control signals.

Common Mistakes: Students often confuse bit stuffing with other techniques like byte stuffing or framing, which can lead to incorrect understanding of the purpose and implementation.

Explanations: Bit stuffing involves inserting a '0' into the user data stream whenever a sequence of bits that could be mistaken for a control signal (such as a flag) is detected. This prevents the receiver from misinterpreting the data as a control signal. The correct answer, Option A, accurately describes this process.

Option Analysis:

Option A: Correct. Bit stuffing involves inserting a '0' in the user stream to avoid confusion with control signals.
Option B: Incorrect. Inserting a '0' in the lag stream is not the correct description of bit stuffing.
Option C: Incorrect. Appending a nibble to the lag sequence is not related to bit stuffing.
Option D: Incorrect. Appending a nibble to the user data stream is not the correct description of bit stuffing.

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Computer networking MCQ - Set 34

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