Computer networking MCQ

1801. Sending a packet to all destinations simultaneously is called.....

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: Broadcasting refers to the transmission of data to all devices in a network simultaneously.

Common Mistakes: Students may confuse broadcasting with multicasting, which sends data to a specific group of devices rather than all devices.

Explanations: Broadcasting is the process of sending a packet to all destinations in a network at once. This is different from multicasting, which targets a specific group of devices, and unicasting, which targets a single device. The term "telecasting" is not a technical term used in networking.

Option Analysis:

Option A: Multicasting sends data to a specific group of devices, not all devices.
Option B: Unicasting sends data to a single device, not all devices.
Option C: Telecasting is not a technical term used in networking.
Option D: Broadcasting sends data to all devices in a network simultaneously.

Mnemonic: Broad-cast, like a radio broadcast reaching all.

1802. In a banyan switch, for 8 inputs and 8 outputs, we have..... stages.

Correct Answer: Correct answer is: (C) 3.

Exam Relevance: Computer Networks, Data Communication, Switching Theory

Difficulty: Moderate

Concept notes: In a banyan switch, the number of stages required is determined by the logarithm base 2 of the number of inputs (or outputs), since each stage doubles the number of paths.

Common Mistakes: Students may confuse the number of stages with the number of inputs or outputs, or they may not understand the logarithmic relationship.

Explanations: For an 8-input and 8-output banyan switch, the number of stages is calculated as log2(8) = 3. Each stage in a banyan switch doubles the number of paths, and three stages are sufficient to connect any input to any output in an 8-input, 8-output configuration.

Option Analysis:

Option A: Incorrect, as 8 stages are not required for an 8-input, 8-output banyan switch.
Option B: Incorrect, as 4 stages are more than necessary for an 8-input, 8-output banyan switch.
Option C: Correct, as 3 stages are sufficient for an 8-input, 8-output banyan switch.
Option D: Incorrect, as 2 stages are insufficient for an 8-input, 8-output banyan switch.

Mnemonic: Log2(8) = 3, Think "Log Three"

1803. Of the following communications channels, which does not provide a physical link between terminal and the computer?

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

Exam Relevance: GATE, GRE, GMAT, JE

Difficulty: Moderate

Concept notes: Microwave communication does not provide a physical link between the terminal and the computer. Instead, it uses electromagnetic waves to transmit data through the air.

Common Mistakes: Students may mistakenly believe that microwave communication requires a physical medium like cables or fibers to transmit data.

Explanations: Microwave communication uses radio waves in the microwave frequency range to transmit data. Unlike optical fiber, telephone lines, and coaxial cables, which require a physical medium to transmit data, microwaves propagate through the air. This makes microwave communication a wireless method, lacking a physical link between the terminal and the computer.

Option Analysis:

Option A: Optical fiber provides a physical link through which data is transmitted using light.
Option B: Telephone lines provide a physical link through which data is transmitted using electrical signals.
Option C: Coaxial cable provides a physical link through which data is transmitted using electrical signals.
Option D: Microwave does not provide a physical link; it uses electromagnetic waves to transmit data wirelessly.

1804. Contention Slots are not found in.....

Correct Answer: Correct answer is: (A) Non-persistent CSMA.

Exam Relevance: Computer Networks, Data Communications, Network Protocols

Difficulty: Moderate

Concept notes: Contention slots are used in protocols to manage access to a shared communication medium. They are not a feature of non-persistent CSMA.

Common Mistakes: Students may confuse contention slots with the backoff algorithm used in non-persistent CSMA.

Explanations: In non-persistent CSMA, a station listens to the medium before attempting to transmit. If the medium is busy, the station waits for a random amount of time and then checks again. Contention slots are not used in this process. Contention slots are more relevant to protocols like CSMA/CD, where they help in managing collisions and retransmissions.

Option Analysis:

Option A: Non-persistent CSMA does not use contention slots. It uses a backoff algorithm to wait for the medium to become free.
Option B: CSMA/CD uses contention slots to manage collisions and retransmissions.
Option C: Bitmap is a data structure and not a protocol, so it does not use contention slots.
Option D: This option is incorrect as contention slots are not found in non-persistent CSMA.

1805. There are four types of computer network namely,

Correct Answer: Correct answer is: (A) PAN, LAN, MAN, WAN.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: The correct answer identifies the four main types of computer networks: Personal Area Network (PAN), Local Area Network (LAN), Metropolitan Area Network (MAN), and Wide Area Network (WAN).

Common Mistakes: Students may confuse the acronyms or types of networks, leading to incorrect selection of options B, C, or D.

Explanations: PAN refers to a network that connects devices within a small area, typically within a person's reach. LAN connects devices within a limited geographical area, such as a home, office, or school. MAN connects a larger area than a LAN but smaller than a WAN, often covering a city or campus. WAN connects devices over a large geographical area, such as different cities or countries.

Option Analysis:

Option A: Correct. PAN, LAN, MAN, and WAN are the correct types of computer networks.
Option B: Incorrect. PIN, LIN, MIN, and WIN are not standard network types.
Option C: Incorrect. CAN, RAN, DAN, and FAN are not standard network types.
Option D: Incorrect. The correct answer is provided in Option A.

Mnemonic: Palm, Lamp, Mam, Wam

1806. When using the loopback address, if TCP/IP is installed correctly, when should you receive a response?

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Very Easy

Concept notes: The loopback address is used to test the TCP/IP stack on a local machine. If TCP/IP is installed correctly, a response should be immediate.

Common Mistakes: Students may mistakenly believe that a delay is expected or that the response depends on external network conditions.

Explanations: The loopback address (127.0.0.1) is used to test the local TCP/IP stack. When a request is sent to the loopback address, it is immediately processed by the local machine's network stack and a response is generated without any network latency. Therefore, if TCP/IP is installed correctly, the response should be immediate.

Option Analysis:

Option A: Correct. The response should be immediate if TCP/IP is installed correctly.
Option B: Incorrect. A response is expected immediately, not only if the address fails.
Option C: Incorrect. The response is not dependent on the next host coming online.
Option D: Incorrect. There is no reason for a delay of two minutes; the response should be immediate.

Mnemonic: Loopback, Local, Instant

1807. Term that is used to design to provide communication in between two moving units is called

Correct Answer: Correct answer is: (B) Cellular Telephony.

Exam Relevance: GATE, GRE, GMAT, JE

Difficulty: Easy

Concept notes: Cellular telephony refers to the technology that enables communication between two moving units, such as mobile phones, through a network of base stations.

Common Mistakes: Students may confuse cellular telephony with cellular stations, which are the physical infrastructure components of a cellular network.

Explanations: Cellular telephony is the term used to describe the technology that allows communication between two moving units, such as mobile phones, through a network of base stations. This technology is designed to provide seamless communication as users move from one cell to another within the network.

Option Analysis:

Option A: Cellular Stations refer to the physical infrastructure components of a cellular network, not the communication technology itself.
Option B: Cellular Telephony is the correct term for the technology that enables communication between two moving units.
Option C: Cellular Frames are not a standard term in cellular communication technology.
Option D: Cellular Signals are the radio waves used in cellular communication but do not encompass the entire technology.

1808. How many crosspoints are needed in a single-stage switch with 40 inputs and 50 outputs?

Correct Answer: Correct answer is: (D) 2000.

Exam Relevance: Computer Networks, Telecommunications, Switching Theory

Difficulty: Moderate

Concept notes: In a single-stage switch, the number of crosspoints is determined by the product of the number of inputs and the number of outputs.

Common Mistakes: Students may mistakenly add the number of inputs and outputs instead of multiplying them.

Explanations: To determine the number of crosspoints in a single-stage switch, we multiply the number of inputs by the number of outputs. Here, the number of inputs is 40 and the number of outputs is 50. Therefore, the number of crosspoints is 40 * 50 = 2000.

Option Analysis:

Option A: Incorrect, as 40 is the number of inputs, not the number of crosspoints.
Option B: Incorrect, as 90 is the sum of inputs and outputs, not the number of crosspoints.
Option C: Incorrect, as 50 is the number of outputs, not the number of crosspoints.
Option D: Correct, as 2000 is the product of the number of inputs and outputs.

Mnemonic: Inputs times outputs, crosspoints count.

1809. The any cast service is included in IPV6. 7..... is a high performance fiber optic token ring LAN running at 100 Mbps over distances upto 1000 stations connected.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: FDDI stands for Fiber Distributed Data Interface, which is a high-performance fiber optic token ring LAN technology.

Common Mistakes: Students may confuse FDDI with other similar acronyms like FDDT or FDDR, which are not standard terms in networking.

Explanations: FDDI is a high-performance fiber optic token ring LAN that operates at 100 Mbps and can support up to 1000 stations. This makes it the correct answer as it matches the description provided in the question.

Option Analysis:

Option A: FDDI is the correct answer as it is a high-performance fiber optic token ring LAN running at 100 Mbps over distances up to 1000 stations connected.
Option B: FDDT is not a standard term in networking and does not match the description given in the question.
Option C: FDDR is not a standard term in networking and does not match the description given in the question.
Option D: FOTR is not a standard term in networking and does not match the description given in the question.

Mnemonic: FDDI: Fast Distributed Data Interface

1810. This is description correct? "A WAN spans distances measured in miles and links two or more separate LANs."

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: A WAN (Wide Area Network) spans large geographical areas, typically measured in miles, and connects multiple LANs (Local Area Networks) together.

Common Mistakes: Students may confuse WAN with LAN, thinking that a WAN only connects devices within a small area.

Explanations: A WAN is designed to cover large geographical distances, often spanning cities, states, or even countries. It connects two or more LANs, which are typically confined to a smaller area like a single building or campus. Therefore, the description is correct.

Option Analysis:

Option A: This option is correct as it accurately describes the function and scope of a WAN.
Option B: This option would be incorrect as the description provided is accurate.
Option C: This option is not appropriate as the description is indeed correct.
Option D: This option is not applicable as the description is correct.

Mnemonic: WAN: Wide Area Network, connects LANs over miles.

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Computer networking MCQ - Set 181

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