Computer networking MCQ – Change your future

211. Which 2 are Disadvantages of a Star Topology?

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

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

Difficulty: Moderate

Concept notes: A star topology is a network configuration where all devices connect to a central hub or switch. The disadvantages include the potential for network failure if the central device fails and the need for additional hardware.

Common Mistakes: Students may confuse the disadvantages of a star topology with those of other network topologies, such as bus or ring topologies.

Explanations: In a star topology, all devices connect to a central hub or switch. If this central device fails, the entire network goes down, making option A correct. Additionally, a star topology requires additional hardware like a central hub or switch, making option B correct. Option C is incorrect because a star topology does not inherently increase collisions; collisions are more common in bus topologies.

Option Analysis:

Option A: This is correct because if the central device fails, the entire network will be affected.
Option B: This is correct because a star topology requires additional hardware such as a central hub or switch.
Option C: This is incorrect because a star topology does not typically experience more collisions compared to other topologies.
Option D: This is the correct choice as it correctly identifies the disadvantages of a star topology.

Mnemonic: STAR: Single point failure, Additional hardware required.

212. The most common and one of the simplest types of networks .

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

Exam Relevance: Networking Fundamentals, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: LAN stands for Local Area Network, which is a network that connects computers and devices within a limited geographical area, such as a home, office, or school.

Common Mistakes: Students may confuse LAN with other types of networks like WAN or MAN, which cover larger geographical areas.

Explanations: LAN is the most common and one of the simplest types of networks because it is designed to connect devices within a small area, making it easy to set up and manage. It is widely used in homes, offices, and schools for sharing resources and communication.

Option Analysis:

Option A: PAN (Personal Area Network) is a network for interconnecting devices centered around an individual, which is not as common or simple as LAN.
Option B: LAN (Local Area Network) is the correct answer as it is the most common and simplest type of network used in various settings.
Option C: MAN (Metropolitan Area Network) covers a larger geographical area than LAN, making it less common and more complex.
Option D: WAN (Wide Area Network) covers a very large geographical area, such as multiple cities or countries, making it less common and more complex than LAN.

Mnemonic: LAN: Local Area Network, Local and Simple

213. ..... is the process of converting digital data to a digital signal.

Correct Answer: Correct answer is: (B) Line coding.

Exam Relevance: GATE, IEEE, ECE exams

Difficulty: Easy

Concept notes: Line coding is the process of converting digital data into a digital signal for transmission over a communication channel.

Common Mistakes: Students may confuse line coding with block coding or scrambling, which are different processes in digital communication.

Explanations: Line coding is specifically designed to convert digital data into a digital signal suitable for transmission. This process ensures that the signal can be accurately transmitted and received over a communication channel. Block coding and scrambling, while related, serve different purposes in digital communication systems.

Option Analysis:

Option A: Block coding is a method used to add redundancy to data for error detection and correction, not for converting data to a signal.
Option B: Line coding is the correct process for converting digital data to a digital signal.
Option C: Scrambling is used to randomize the data to avoid long sequences of the same bit, but it does not convert data to a signal.
Option D: This option is incorrect as line coding is the correct process.

214. A device that connects the internal networks and the outside network (Internet). In such a situation, it could also act as a proxy server and a firewall.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: A gateway is a device that connects different networks, such as an internal network and the Internet. It can also function as a proxy server and a firewall.

Common Mistakes: Students may confuse a gateway with a switch, which only connects devices within the same network, or a hub, which broadcasts data to all connected devices.

Explanations: A gateway is the correct answer because it is designed to connect different networks, such as an internal network and the Internet. It can also act as a proxy server, which can manage and control network traffic, and as a firewall, which can protect the internal network from unauthorized access. A switch, repeater, and hub do not have these capabilities.

Option Analysis:

Option A: Gateway is the correct answer as it connects different networks and can act as a proxy server and firewall.
Option B: Switch is incorrect because it only connects devices within the same network and does not provide the functions of a proxy server or firewall.
Option C: Repeater is incorrect because it only amplifies signals and does not connect different networks or provide security functions.
Option D: Hub is incorrect because it broadcasts data to all connected devices and does not connect different networks or provide security functions.

Mnemonic: GATE: Gateway Acts To Enable

215. What are the distinct functions of layer 2 switching that increase available bandwidth on the network? 1. Address learning 2. Routing 3. Forwarding and filtering 4. Creating network loops 5. Loop avoidance 6. IP addressing

Correct Answer: Correct answer is: (A) 1, 3 and 5.

Exam Relevance: CCNA, CompTIA Network+, Cisco Certified Network Associate

Difficulty: Moderate

Concept notes: Layer 2 switching involves several functions that increase network bandwidth, including address learning, forwarding and filtering, and loop avoidance.

Common Mistakes: Students may confuse layer 2 switching functions with layer 3 routing functions, leading to incorrect selection of options.

Explanations: Layer 2 switching increases available bandwidth on the network through the following functions: 1. Address learning: Switches learn the MAC addresses of devices connected to their ports, allowing them to efficiently direct traffic to the correct destination. 3. Forwarding and filtering: Switches forward frames to the appropriate port based on the destination MAC address, while filtering out frames that do not need to be sent to all ports, thus reducing unnecessary traffic. 5. Loop avoidance: Switches use protocols like Spanning Tree Protocol (STP) to prevent network loops, which can cause broadcast storms and consume bandwidth. These functions collectively enhance network efficiency and bandwidth utilization.

Option Analysis:

Option A: Correct. Address learning, forwarding and filtering, and loop avoidance are key functions of layer 2 switching that increase network bandwidth.
Option B: Incorrect. Routing, creating network loops, and IP addressing are not layer 2 switching functions.
Option C: Incorrect. Routing and IP addressing are not layer 2 switching functions.
Option D: Incorrect. While forwarding and filtering are correct, loop avoidance is also a critical function that increases bandwidth.

216. ..... uses thick coaxial cable.

Correct Answer: Correct answer is: (A) 10Base5.

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

Difficulty: Easy

Concept notes: 10Base5 is a type of Ethernet that uses thick coaxial cable, also known as "thicknet."

Common Mistakes: Students may confuse 10Base5 with 10Base2, which uses thin coaxial cable ("thinnet").

Explanations: 10Base5 uses thick coaxial cable, which is a robust and durable type of cable designed to support longer distances and more connected devices compared to other Ethernet standards. This thick coaxial cable is often referred to as "thicknet" and is characterized by its large diameter and the ability to support up to 100 devices over a maximum length of 500 meters.

Option Analysis:

Option A: 10Base5 uses thick coaxial cable, which is correct.
Option B: 10Base2 uses thin coaxial cable, not thick.
Option C: 10Base-T uses twisted pair cables, not coaxial.
Option D: 10Base-F uses fiber optic cables, not coaxial.

Mnemonic: Thicknet for 10Base5, think "thick" for "thicknet."

217. A personal computer or workstation on an Ethernet network must have one of these cards.

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

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

Difficulty: Easy

Concept notes: A Network Interface Card (NIC) is a hardware component that allows a computer to connect to a network.

Common Mistakes: Students may confuse NIC with other acronyms like TDI (Transport Driver Interface) or PCI (Peripheral Component Interconnect).

Explanations: A personal computer or workstation on an Ethernet network must have a Network Interface Card (NIC) to communicate with the network. The NIC provides the necessary hardware and software to enable the computer to send and receive data over the network.

Option Analysis:

Option A: TDI is not a hardware component but a software interface for network drivers.
Option B: NIC is the correct answer as it is the hardware component required for network communication.
Option C: PCI is a type of computer bus used for connecting peripheral devices, not a network interface.
Option D: This option is incorrect as NIC is the correct answer.

Mnemonic: NIC - Network Interface Card

218. We use Cryptography term to transforming messages to make them secure and immune to

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

Exam Relevance: CISSP, CompTIA Security+, CISA

Difficulty: Moderate

Concept notes: Cryptography is the practice of securing communication from adversaries by transforming messages into a secure format.

Common Mistakes: Students may confuse the purpose of cryptography with simply changing the message, which is not the primary goal.

Explanations: Cryptography is used to protect messages from unauthorized access and attacks. The primary goal is to ensure that only intended recipients can read the message, making it immune to attacks from potential adversaries.

Option Analysis:

Option A: Change is not the primary goal of cryptography; it is the method used to achieve security.
Option B: Idle is not relevant to the purpose of cryptography.
Option C: Attacks are the primary threat that cryptography aims to protect against.
Option D: Defend is a general term and does not specifically address the targeted threat of attacks.

219. Controlling access to a network by analyzing the incoming and outgoing packets is called

Correct Answer: Correct answer is: (C) Packet Filtering.

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Moderate

Concept notes: Packet filtering is a method of controlling network access by examining and filtering packets based on their source and destination addresses, port numbers, and other criteria.

Common Mistakes: Students may confuse packet filtering with other types of filtering, such as IP filtering, which is a subset of packet filtering.

Explanations: Packet filtering involves analyzing the headers of incoming and outgoing packets to determine whether they should be allowed to pass through the network. This method is used to control access by setting rules that specify which packets are permitted and which are blocked. The term "packet filtering" encompasses the broader concept of examining packets for various attributes, including IP addresses, which makes it the correct answer over the more specific "IP Filtering."

Option Analysis:

Option A: IP Filtering is a specific type of packet filtering that focuses on IP addresses, but it does not encompass the broader concept of packet filtering.
Option B: Data Filtering is a general term and does not specifically refer to the process of analyzing packets for network access control.
Option C: Packet Filtering is the correct term for the process of examining and filtering packets based on various criteria to control network access.
Option D: Firewall Filtering is a broader term that includes packet filtering but is not as specific to the process of analyzing packets.

220. What is Fiber-optic cabling?

Correct Answer: Correct answer is: (C) . Uses glass or plastic fiber to carry information as light pulses.

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

Difficulty: Easy

Concept notes: Fiber-optic cabling transmits data using light pulses through glass or plastic fibers.

Common Mistakes: Students may confuse fiber-optic cabling with copper cabling, which uses electrical signals.

Explanations: Fiber-optic cabling uses glass or plastic fibers to transmit data as light pulses. This method is highly efficient and can transmit data over long distances with minimal signal loss. The light pulses travel through the fiber, which is designed to guide the light with minimal dispersion.

Option Analysis:

Option A: Incorrect, as fiber-optic cabling does not use electrical signals.
Option B: Incorrect, as fiber-optic cabling does not use radio signals, infrared technology, or satellite transmission.
Option C: Correct, as fiber-optic cabling uses glass or plastic fibers to carry information as light pulses.
Option D: Incorrect, as the correct answer is provided in option C.

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Computer networking MCQ - Set 22

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