Computer networking MCQ

961. What are two characteristics of fiber-optic cable? (Choose two.)

Correct Answer: Correct answer is: (D) Only (A) & (B).

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

Difficulty: Moderate

Concept notes: Fiber-optic cable is known for its high cost and resistance to electromagnetic interference (EMI) and radio-frequency interference (RFI).

Common Mistakes: Students may incorrectly assume that fiber-optic cable has metallic shielding, similar to some types of copper cabling.

Explanations: Fiber-optic cable is more expensive than unshielded twisted pair (UTP) cabling due to the materials and manufacturing processes involved. Additionally, fiber-optic cable is not affected by EMI or RFI because it uses light to transmit data, rather than electrical signals. Option C is incorrect because fiber-optic cable does not use metallic foil; it transmits data through glass or plastic fibers.

Option Analysis:

Option A: Fiber-optic cable is indeed more expensive than UTP cabling due to the materials and manufacturing processes involved.
Option B: Fiber-optic cable is not affected by EMI or RFI because it uses light to transmit data, rather than electrical signals.
Option C: Fiber-optic cable does not use metallic foil; it transmits data through glass or plastic fibers.
Option D: This option correctly identifies that only options A and B are true characteristics of fiber-optic cable.

962. Coaxial cable has conductors with

Correct Answer: Correct answer is: (D) A common axis.

Exam Relevance: GATE, ECE, EE

Difficulty: Easy

Concept notes: Coaxial cables are designed with two conductors that share a common axis.

Common Mistakes: Students may confuse the physical properties of coaxial cables with other types of cables, such as twisted pair cables, which do not necessarily have conductors with a common axis.

Explanations: Coaxial cables consist of an inner conductor surrounded by a tubular insulating layer, followed by a tubular conducting shield. The inner conductor and the shield share a common axis, which is a defining characteristic of coaxial cables. This design allows for effective transmission of high-frequency signals with minimal interference.

Option Analysis:

Option A: Coaxial cables do not necessarily have conductors with equal resistance. The resistance depends on the material and dimensions of the conductors.
Option B: The inner conductor and the shield do not need to have the same diameter. The inner conductor is typically smaller than the shield.
Option C: Since neither A nor B are correct, this option cannot be correct.
Option D: This is the correct answer as the inner conductor and the shield share a common axis.

Mnemonic: Coaxial: Common Axis

963. "BAUD" rate means

Correct Answer: Correct answer is: (C) The rate at which the signal changes.

Exam Relevance: GATE, ECE, Computer Networks

Difficulty: Moderate

Concept notes: The term "BAUD" rate refers to the rate at which the signal changes in a communication system.

Common Mistakes: Students often confuse "BAUD" rate with "bit rate," thinking it refers to the number of bits transmitted per unit time.

Explanations: The "BAUD" rate is defined as the number of signal changes per second. It measures the speed at which the signal transitions from one state to another, not the number of bits or bytes transmitted. This is why the correct answer is the rate at which the signal changes.

Option Analysis:

Option A: Incorrect, as "BAUD" rate does not measure the number of bits transmitted per unit time.
Option B: Incorrect, as "BAUD" rate does not measure the number of bytes transmitted per unit time.
Option C: Correct, as "BAUD" rate measures the rate at which the signal changes.
Option D: Incorrect, as the correct answer is provided in option C.

964. Which of the following connectivity options gives you the best mobility?

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: Cellular networks provide the best mobility because they allow users to maintain connectivity while moving across large areas.

Common Mistakes: Students may confuse cellular with wired connections, which are stationary and do not offer the same level of mobility.

Explanations: Cellular networks are designed to provide connectivity to mobile devices, such as smartphones and tablets, allowing users to maintain a connection while moving across different locations. This makes cellular the best option for mobility compared to wired, wireless, or broadband connections, which are typically limited to specific areas or require a fixed location.

Option Analysis:

Option A: Cellular networks offer the highest level of mobility as they are designed for mobile devices and can maintain connectivity across large areas.
Option B: Wireless connections, such as Wi-Fi, are limited to specific areas and do not provide the same level of mobility as cellular networks.
Option C: Wired connections are stationary and do not offer mobility, as they require a physical connection to a network.
Option D: Broadband connections can be either wired or wireless, but they are typically limited to specific areas and do not offer the same level of mobility as cellular networks.

Mnemonic: C for Cellular, C for Constant Connectivity on the Go.

965. The problem of a station not being able to detect a potential competitor for the medium because it thinks that there is activity between them is called.....

Correct Answer: Correct answer is: (A) Exposed Station Problem.

Exam Relevance: Computer Networks, Wireless Communications, Network Security

Difficulty: Moderate

Concept notes: The Exposed Station Problem occurs in wireless networks where a station cannot detect a potential competitor for the medium because it thinks there is ongoing activity between other stations.

Common Mistakes: Students often confuse the Exposed Station Problem with the Hidden Station Problem, where a station cannot detect another station due to physical obstructions.

Explanations: In the Exposed Station Problem, a station may incorrectly assume that the medium is busy due to activity between other stations, even though it could potentially communicate with a station that is not part of the ongoing activity. This leads to unnecessary channel inactivity and reduced network efficiency.

Option Analysis:

Option A: Correct. The Exposed Station Problem describes the scenario where a station cannot detect a potential competitor for the medium because it thinks there is ongoing activity between other stations.
Option B: Incorrect. Collision Avoidance Problem refers to techniques used to prevent collisions, not the inability to detect competitors.
Option C: Incorrect. The Hidden Station Problem occurs when a station cannot detect another station due to physical obstructions, not due to perceived ongoing activity.
Option D: Incorrect. Access Grant Problem is not a standard term in wireless networking and does not describe the issue of detecting competitors.

Mnemonic: ESP: Exposed Station Problem - "Exposure to ongoing activity"

966. Computer in a computer network are connected by

Correct Answer: Correct answer is: (C) Either telephone line or satellite channel.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: In a computer network, devices can be connected through various communication channels, including telephone lines and satellite channels.

Common Mistakes: Students might think that only one type of connection is used in a network, overlooking the variety of available options.

Explanations: Computer networks can use different types of communication channels to connect devices. Telephone lines and satellite channels are two common methods. Telephone lines are often used for wired connections, while satellite channels are used for wireless connections. Therefore, the correct answer is that either telephone line or satellite channel can be used to connect computers in a network.

Option Analysis:

Option A: Incorrect because satellite channels are not the only method for connecting computers in a network.
Option B: Incorrect because telephone lines are not the only method for connecting computers in a network.
Option C: Correct because both telephone lines and satellite channels can be used to connect computers in a network.
Option D: Incorrect because there are valid methods for connecting computers in a network.

967. This Topology structure gets its name from how the central node functions as a sort of trunk for the network, with nodes extending outward in a branch-like fashion

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

Exam Relevance: Computer Networks, Data Communications, Network Design

Difficulty: Moderate

Concept notes: Tree Topology is a hierarchical structure where nodes are connected in a branching pattern, resembling a tree.

Common Mistakes: Students may confuse Tree Topology with Star Topology, which has a central hub but lacks the hierarchical branching structure.

Explanations: In a Tree Topology, the central node acts as a trunk, with other nodes extending outward in a branch-like fashion. This hierarchical structure allows for efficient data flow and management, making it suitable for large networks. The central node can be connected to multiple secondary nodes, which in turn can connect to further nodes, creating a branching network.

Option Analysis:

Option A: Tree Topology correctly describes the hierarchical branching structure with a central node acting as a trunk.
Option B: Ring Topology involves nodes connected in a circular fashion, which does not match the description of a central node with branches.
Option C: Mesh Topology involves nodes connected in a mesh-like structure, where each node is connected to multiple other nodes, not a hierarchical branching structure.
Option D: Star Topology involves a central node connected to all other nodes, but lacks the hierarchical branching structure described.

Mnemonic: Think "Tree" for "Trunk and Branches".

968. FTP server listens for connection on port number

Correct Answer: Correct answer is: (B) 21.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: FTP (File Transfer Protocol) servers listen on port 21 for incoming connections.

Common Mistakes: Students often confuse FTP port 21 with other common ports like SSH (22) or Telnet (23).

Explanations: FTP servers use port 21 to listen for incoming connection requests. This port is designated for the control channel of FTP, which is used for sending commands and receiving responses. Port 20 is used for data transfer, but the control channel, which is essential for initiating the connection, uses port 21.

Option Analysis:

Option A: Port 20 is used for data transfer in FTP, not for listening for connections.
Option B: Port 21 is the correct port for the control channel of FTP, where the server listens for incoming connections.
Option C: Port 22 is used for SSH (Secure Shell) protocol, not FTP.
Option D: Port 23 is used for Telnet, not FTP.

Mnemonic: FTP listens on 21, not 22 or 23.

969. What is a client computer?

Correct Answer: Correct answer is: (B) A normal computer that does basic functions.

Exam Relevance: AP Computer Science Principles, CompTIA A+, IT Essentials

Difficulty: Easy

Concept notes: A client computer is a standard computer used by end-users to access network resources and perform basic computing tasks.

Common Mistakes: Students may confuse a client computer with a server, which is a more powerful computer that controls and manages network resources.

Explanations: A client computer is designed to perform basic functions such as running applications, accessing the internet, and connecting to network resources. It is not a powerful computer that controls the network, which is the role of a server. Therefore, the correct answer is a normal computer that does basic functions.

Option Analysis:

Option A: Incorrect because a client computer can connect to a network.
Option B: Correct because a client computer performs basic functions and can connect to a network.
Option C: Incorrect because a powerful computer that controls the network is a server, not a client.
Option D: Incorrect because a powerful computer that does basic functions is not the definition of a client computer.

970. The protocol for transmission control is

Correct Answer: Correct answer is: (C) TCP/IP.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: TCP/IP is the protocol suite used for controlling the transmission of data over the internet and other networks.

Common Mistakes: Students may confuse TCP/IP with other protocols like HTTPS, SMTP, or DNS, which are specific applications or services rather than the foundational transmission control protocol.

Explanations: TCP/IP (Transmission Control Protocol/Internet Protocol) is the foundational protocol suite used for controlling the transmission of data over the internet and other networks. It ensures reliable data transmission by breaking data into packets, routing them through the network, and reassembling them at the destination. This makes TCP/IP the correct answer for the protocol used for transmission control.

Option Analysis:

Option A: HTTPS is a secure protocol for web browsing, not a transmission control protocol.
Option B: SMTP is a protocol for sending email, not a transmission control protocol.
Option C: TCP/IP is the correct protocol suite for controlling data transmission over networks.
Option D: DNS is a protocol for translating domain names into IP addresses, not a transmission control protocol.

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Computer networking MCQ - Set 97

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