Computer networking MCQ

1911. Which network is spread within a city

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

Exam Relevance: CCNA, Network+ Certification, CompTIA Network+

Difficulty: Easy

Concept notes: MAN stands for Metropolitan Area Network, which is a network that spans a city or a large campus.

Common Mistakes: Students may confuse MAN with LAN (Local Area Network), which is typically confined to a single building or small area.

Explanations: MAN is designed to cover a larger geographical area than a LAN but smaller than a WAN. It is commonly used to connect multiple LANs within a city or a metropolitan area, making it the correct choice for a network spread within a city.

Option Analysis:

Option A: PAN (Personal Area Network) is too small, typically covering a person's workspace.
Option B: MAN (Metropolitan Area Network) is the correct choice as it covers a city or large campus.
Option C: LAN (Local Area Network) is too small, typically covering a single building or small area.
Option D: WAN (Wide Area Network) covers a much larger area, such as multiple cities or countries.

Mnemonic: MAN: Metropolitan Area Network, think "Metropolis" for city-wide coverage.

1912. A bridge has a table that maps addresses to

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

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Moderate

Concept notes: A bridge in networking uses a forwarding table to map MAC addresses to the appropriate ports for data transmission.

Common Mistakes: Students may confuse the function of a bridge with other network devices like routers or switches, which have different mapping functions.

Explanations: A bridge maintains a table that maps MAC addresses to the specific ports through which the devices are connected. This allows the bridge to forward data frames to the correct destination port, improving network efficiency and reducing unnecessary traffic.

Option Analysis:

Option A: Nodes are endpoints in a network, not the mapping target for a bridge's table.
Option B: Signals are not mapped by a bridge's table; they are transmitted over the network.
Option C: Media refers to the physical medium of transmission, not the mapping target for a bridge's table.
Option D: The bridge's table maps MAC addresses to ports, which is the correct function.

Mnemonic: Bridge Maps MAC to Port

1913. Size and format of physical addresses vary depending on the

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

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Moderate

Concept notes: Physical addresses, such as MAC addresses, vary in size and format based on the network technology and standards used.

Common Mistakes: Students may mistakenly believe that the size and format of physical addresses are determined by the sender or receiver, rather than the network standards.

Explanations: The size and format of physical addresses are defined by the network standards and protocols in use. Different network technologies, such as Ethernet, Wi-Fi, or Token Ring, have their own specifications for physical addresses. These specifications determine the length and structure of the addresses used within that network. Therefore, the network itself dictates the format and size of physical addresses, not the sender, receiver, or message.

Option Analysis:

Option A: The receiver does not determine the size and format of physical addresses.
Option B: The message content does not influence the size and format of physical addresses.
Option C: The sender does not determine the size and format of physical addresses.
Option D: The network standards and protocols define the size and format of physical addresses.

1914. Unmodulated signal coming from a transmitter is know as

Correct Answer: Correct answer is: (B) Baseband signal.

Exam Relevance: GATE, ECE exams, IEEE exams

Difficulty: Easy

Concept notes: A baseband signal is an unmodulated signal that carries information directly without any carrier wave. It is the original signal before any form of modulation is applied.

Common Mistakes: Students may confuse the baseband signal with the carrier signal, which is a high-frequency signal used to carry the baseband signal after modulation.

Explanations: The unmodulated signal coming from a transmitter is known as the baseband signal. This is because it is the original signal that has not been modulated onto a carrier wave. The baseband signal contains the information to be transmitted and is directly used in the transmission process before any modulation takes place.

Option Analysis:

Option A: A carrier signal is a high-frequency signal used to carry the modulated information. It is not the unmodulated signal coming from the transmitter.
Option B: The baseband signal is the unmodulated signal that carries the information directly. This is the correct answer.
Option C: The term "primary signal" is not a standard term in telecommunications and does not specifically refer to the unmodulated signal.
Option D: This option is incorrect as the correct answer is provided in the options.

1915. Communication between computers is almost always

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

Exam Relevance: Computer Science, Networking, Information Technology

Difficulty: Moderate

Concept notes: Serial communication involves sending data one bit at a time over a single channel, which is commonly used for communication between computers due to its simplicity and efficiency in long-distance data transmission.

Common Mistakes: Students often confuse serial communication with parallel communication, which sends multiple bits simultaneously over multiple channels.

Explanations: Serial communication is the most common method for data transmission between computers because it uses fewer wires, is simpler to implement, and is more efficient for long-distance communication. Parallel communication, while faster for short distances, requires multiple wires and is more complex to implement, making it less practical for most computer-to-computer communication scenarios.

Option Analysis:

Option A: Direct communication is not a standard term in computer networking and does not describe a common method of data transmission.
Option B: Serial communication is the correct answer as it is the most common method for data transmission between computers.
Option C: Parallel communication is less common for long-distance data transmission due to its complexity and the need for multiple wires.
Option D: Series parallel is not a standard term in computer communication and does not describe a common method of data transmission.

Mnemonic: S-COM: Serial Communication Over Many

1916. Which of the following is a voiceband channel?

Correct Answer: Correct answer is: (A) Telephone line.

Exam Relevance: Telecommunications Engineering, Electronics Engineering, Communication Systems

Difficulty: Easy

Concept notes: Voiceband channels are communication channels designed to carry voice signals, typically within the frequency range of 300 Hz to 3400 Hz.

Common Mistakes: Students may confuse voiceband channels with other types of communication channels, such as broadband channels, which operate at higher frequencies.

Explanations: A telephone line is a voiceband channel because it is specifically designed to transmit voice signals within the frequency range of 300 Hz to 3400 Hz. This range is sufficient for human speech and is the standard for traditional telephone communication.

Option Analysis:

Option A: Correct. Telephone lines are voiceband channels designed for voice communication.
Option B: Incorrect. Coaxial cables are used for broadband communication, which can carry a wider range of frequencies.
Option C: Incorrect. Microwave systems are used for high-speed data transmission and operate at much higher frequencies than voiceband channels.
Option D: Incorrect. Telegraph lines are used for transmitting text messages and do not fall under the category of voiceband channels.

1917. The domain name that ends with a period?

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

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

Difficulty: Moderate

Concept notes: Domain names that end with a period are considered absolute domain names.

Common Mistakes: Students may confuse absolute domain names with relative domain names, which do not end with a period.

Explanations: An absolute domain name is a fully qualified domain name that ends with a period. This indicates that the domain name is complete and does not need to be resolved relative to any other domain. The trailing period signifies that the domain name is an absolute reference, pointing directly to the root of the DNS hierarchy.

Option Analysis:

Option A: Incorrect. "Completed" does not accurately describe the characteristic of ending with a period.
Option B: Incorrect. "Incomplete" is the opposite of what a domain name ending with a period represents.
Option C: Correct. An absolute domain name ends with a period, indicating it is a fully qualified domain name.
Option D: Incorrect. "Universal" does not specifically relate to the characteristic of ending with a period.

1918. Numbering System is one of Prominent feature of

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: TCP (Transmission Control Protocol) is known for its reliable, connection-oriented communication, which includes features like sequencing and acknowledgment of packets.

Common Mistakes: Students may confuse TCP with IP, as both are part of the TCP/IP suite, but IP does not provide the same level of reliability and sequencing.

Explanations: TCP includes a numbering system to ensure that packets are delivered in the correct order and to detect and recover lost packets. This feature is crucial for maintaining the integrity of data transmission. IP, on the other hand, is connectionless and does not guarantee packet delivery or order.

Option Analysis:

Option A: UDP does not provide a numbering system for packet sequencing and reliability.
Option B: TCP includes a numbering system for reliable, ordered data transmission.
Option C: TCP/IP is a suite of protocols, but the numbering system is a feature of TCP specifically.
Option D: IP is connectionless and does not include a numbering system for packet sequencing.

Mnemonic: TCP: Trusty, Connected, Packets

1919. Two networks each provide reliable connection-oriented service. One of them offers a reliable byte stream and the other offers a reliable message stream. A process writes 1024 bytes, then

Correct Answer: Correct answer is: (B) Message stream network will receive 1024 bytes only at one time. But byte stream network will receive 2048 bytes as a single unit.

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Moderate

Concept notes: In a message stream network, data is transmitted as discrete messages, each with its own boundaries. In a byte stream network, data is transmitted as a continuous stream of bytes without message boundaries.

Common Mistakes: Students may confuse the behavior of message stream and byte stream networks, thinking both will treat the data in the same way.

Explanations: A message stream network transmits data as discrete messages, so it will receive the 1024 bytes as a single message. A byte stream network, however, treats data as a continuous stream, so it will receive the 1024 bytes as part of a larger stream, potentially combining it with subsequent writes into a single unit.

Option Analysis:

Option A: Incorrect because both networks do not receive 2048 bytes as a single unit.
Option B: Correct because the message stream network receives 1024 bytes as a single message, while the byte stream network may combine it with subsequent writes into a single unit.
Option C: Incorrect because the message stream network does not receive 2048 bytes as a whole.
Option D: Incorrect because the byte stream network does not necessarily receive only 1024 bytes at a time.

Mnemonic: Message = Discrete, Byte = Stream

1920. Frame relay indicates network congestion using two flags namely..... bits in data frames.

Correct Answer: Correct answer is: (C) Both a & b.

Exam Relevance: CCNA, Network+, CompTIA Network+

Difficulty: Easy

Concept notes: Frame relay uses two flags, Forward Explicit Congestion Notification (FECN) and Backward Explicit Congestion Notification (BECN), to indicate network congestion.

Common Mistakes: Students may mistakenly believe that only one of the flags is used to indicate congestion, or they may confuse the functions of FECN and BECN.

Explanations: Frame relay employs two specific flags to signal congestion: FECN and BECN. FECN is set in a frame when the frame is being forwarded from the source to the destination, indicating that congestion was encountered in the forward direction. BECN is set in a frame when the frame is being sent back from the destination to the source, indicating that congestion was encountered in the backward direction. Therefore, both flags are used to indicate network congestion, making option C the correct answer.

Option Analysis:

Option A: Only mentions FECN, which is not sufficient as BECN is also used.
Option B: Only mentions BECN, which is not sufficient as FECN is also used.
Option C: Correctly identifies both FECN and BECN as the flags used to indicate congestion.
Option D: Incorrect as both FECN and BECN are used.

Mnemonic: FECN forwards, BECN backs.

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Computer networking MCQ - Set 192

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