Computer networking MCQ

1151. This device performs a lot of processing to filter and readdress network packets:

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: A router performs complex processing to filter and readdress network packets.

Common Mistakes: Students may confuse a router with a switch, which primarily forwards packets based on MAC addresses without the same level of processing.

Explanations: A router performs a significant amount of processing to filter and readdress network packets. It uses routing tables to determine the best path for data to travel across different networks. This involves analyzing packet headers, applying filtering rules, and making decisions based on network conditions. In contrast, a hub simply broadcasts data to all connected devices, and a switch forwards data based on MAC addresses without the same level of processing. A modem primarily converts digital signals to analog and vice versa for transmission over telephone lines, not performing packet processing.

Option Analysis:

Option A: A router performs complex processing to filter and readdress network packets.
Option B: A hub does not perform any processing; it simply broadcasts data to all connected devices.
Option C: A switch forwards data based on MAC addresses but does not perform the same level of packet processing as a router.
Option D: A modem converts digital signals to analog and vice versa for transmission over telephone lines, not performing packet processing.

Mnemonic: Routers Route, Others Don't

1152. Very high-bit-rate Digital Subscriber Line's (VDSAL) downstream rate is

Correct Answer: Correct answer is: (D) 25-55 Mbps.

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

Difficulty: Moderate

Concept notes: Very high-bit-rate Digital Subscriber Line (VDSL) is a type of DSL technology that provides high-speed data transmission over existing copper telephone lines. The downstream rate for VDSL can range from 25 Mbps to 55 Mbps, depending on the specific implementation and distance from the central office.

Common Mistakes: Students often confuse VDSL with other DSL technologies such as ADSL or HDSL, which have different downstream rate ranges.

Explanations: VDSL is designed to support high-speed data transmission over short distances, typically up to 1.2 kilometers. The downstream rate of 25-55 Mbps is significantly higher than other DSL technologies, making it suitable for applications requiring high bandwidth, such as video streaming and online gaming.

Option Analysis:

Option A: 768 kbps is the downstream rate for ADSL, not VDSL.
Option B: 1.5 Mbps is the downstream rate for HDSL, not VDSL.
Option C: 1.5-6.1 Mbps is the downstream rate for ADSL2+, not VDSL.
Option D: 25-55 Mbps is the correct downstream rate for VDSL.

Mnemonic: VDSL: Very Data Speedy Line

1153. Moving Picture Experts Group (MPEG) is used to compress

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

Exam Relevance: GRE, MCSE, CompTIA A+

Difficulty: Moderate

Concept notes: MPEG is a standard for compressing video data, which includes both visual and audio components.

Common Mistakes: Students may confuse MPEG with JPEG, which is used for still images rather than video.

Explanations: MPEG is specifically designed to compress video data, which includes both visual and audio components. It is widely used in various video formats such as MPEG-1, MPEG-2, and MPEG-4. While MPEG can handle audio, its primary purpose is to compress video data, making it suitable for storage and transmission. Therefore, the correct answer is video.

Option Analysis:

Option A: Frames are part of video, but MPEG is not just for frames; it is for the entire video format.
Option B: Images are compressed using formats like JPEG, not MPEG.
Option C: While MPEG can handle audio, its primary purpose is video compression.
Option D: MPEG is used to compress video, which includes both visual and audio components.

Mnemonic: Video, Motion, Picture, Expert, Group

1154. Identify the odd term amongst the following group:

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

Exam Relevance: GATE, GRE, GMAT, JE

Difficulty: Moderate

Concept notes: Microwaves are a form of electromagnetic radiation, while coaxial cable, optical fibre, and twisted pair wire are physical media used for data transmission.

Common Mistakes: Students may confuse microwaves with other forms of physical transmission media, as they are all used in communication systems.

Explanations: Coaxial cable, optical fibre, and twisted pair wire are physical media used for transmitting data. They are tangible components that can be physically connected to form a network. In contrast, microwaves are a form of electromagnetic radiation used for wireless communication. They do not require a physical medium to transmit data, making them distinct from the other options.

Option Analysis:

Option A: Coaxial cable is a physical medium used for transmitting data over long distances with minimal interference.
Option B: Optical fibre is a physical medium that uses light to transmit data over long distances with high bandwidth and low signal loss.
Option C: Twisted pair wire is a physical medium used for transmitting data over short to medium distances, often in local area networks.
Option D: Microwaves are a form of electromagnetic radiation used for wireless communication, not a physical medium.

1155. Expansion of FTP is

Correct Answer: Correct answer is: (B) File Transfer Protocol.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Very Easy

Concept notes: FTP stands for File Transfer Protocol, which is a standard network protocol used for the transfer of files from one host to another over a TCP-based network, such as the Internet.

Common Mistakes: Students might confuse FTP with other acronyms that start with "F" and relate to technology, such as FPT (Fine Transfer Protocol) or FTP (First Transfer Protocol).

Explanations: FTP is the correct expansion because it is the widely recognized and standardized protocol for transferring files over the internet. The other options are not recognized acronyms in the context of file transfer protocols.

Option Analysis:

Option A: Fine Transfer Protocol is not a recognized term in the context of file transfer protocols.
Option B: File Transfer Protocol is the correct expansion of FTP.
Option C: First Transfer Protocol is not a recognized term in the context of file transfer protocols.
Option D: None of the mentioned is incorrect as File Transfer Protocol is a valid and widely used term.

Mnemonic: FTP: Files Traveling Properly

1156. The passive and active components make up what is referred to as the network

Correct Answer: Correct answer is: (D) Both a and b.

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Moderate

Concept notes: In network design, the terms "network fabric" and "switch fabric" are often used to describe the underlying infrastructure that connects various components of a network. This includes both passive and active components.

Common Mistakes: Students may confuse the terms "network fabric" and "switch fabric" with only active components, overlooking the role of passive components.

Explanations: The network fabric encompasses the entire infrastructure of a network, including both passive and active components. Passive components include cables, connectors, and other non-powered elements, while active components include switches, routers, and other powered devices. The term "switch fabric" is often used interchangeably with "network fabric" in the context of switching technologies, which also includes both passive and active components. Therefore, both terms refer to the complete network infrastructure, making option D the correct answer.

Option Analysis:

Option A: Switch fabric is a subset of network fabric and includes both passive and active components, but it is not the only term used.
Option B: Network fabric is a broader term that includes both passive and active components, but it is not the only term used.
Option C: Fibers are a type of passive component, but they do not encompass the entire network infrastructure.
Option D: Both network fabric and switch fabric are terms that include both passive and active components, making this the correct answer.

Mnemonic: Fabric = All, Switch = All

1157. ..... command is used to manipulate TCP/IP routing table.

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: The "route" command is used to manipulate the IP routing table on a computer.

Common Mistakes: Students often confuse the "route" command with "ipconfig" or "ifconfig," which are used to display IP configuration information rather than manipulate the routing table.

Explanations: The "route" command is specifically designed to add, delete, and display IP routing table entries. It allows administrators to manage the routing table directly, which is crucial for configuring network paths and ensuring proper network communication.

Option Analysis:

Option A: The "route" command is used to manipulate the IP routing table.
Option B: The "ipconfig" command is used to display IP configuration information on Windows systems.
Option C: The "ifconfig" command is used to display and configure network interface parameters on Unix-like systems.
Option D: The "traceroute" command is used to determine the route packets take to a destination.

1158. An example of FDM:

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

Exam Relevance: Networking Exams, Telecommunications Exams, Digital Communications Exams

Difficulty: Easy

Concept notes: Frequency Division Multiplexing (FDM) is a technique where multiple signals are combined for transmission over a single medium by assigning each signal a unique frequency band.

Common Mistakes: Students may confuse FDM with Time Division Multiplexing (TDM), where signals are assigned different time slots rather than different frequencies.

Explanations: Broadcast radio is an example of FDM because multiple radio stations transmit their signals simultaneously over the airwaves, each using a different frequency band. This allows listeners to tune into different stations without interference.

Option Analysis:

Option A: Correct. Broadcast radio uses FDM to transmit multiple signals over different frequency bands.
Option B: Incorrect. The telephone system typically uses TDM or other multiplexing techniques, not FDM.
Option C: Incorrect. "Machines" is too vague and does not specifically relate to FDM.
Option D: Incorrect. Semi-duplex communication refers to a communication mode where both parties can transmit, but not simultaneously, and does not describe FDM.

1159. A switched network consists of a series of interlinked nodes, called

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

Exam Relevance: CCNA, Network+, CompTIA Network+

Difficulty: Easy

Concept notes: In a switched network, the core components that interlink to form the network are called switches.

Common Mistakes: Students may confuse switches with endpoints or packets, which are not the interlinking nodes in a switched network.

Explanations: A switched network is designed to efficiently route data between devices. The interlinking nodes that facilitate this routing are called switches. Switches are responsible for directing data packets to their intended destinations within the network. Endpoints are the devices that send and receive data, while packets are the units of data being transmitted. Links are the connections between nodes, but they are not the nodes themselves.

Option Analysis:

Option A: Endpoints are the devices that send and receive data, not the interlinking nodes.
Option B: Packets are the units of data being transmitted, not the interlinking nodes.
Option C: Switches are the interlinking nodes that direct data packets to their destinations.
Option D: Links are the connections between nodes, not the nodes themselves.

1160. The communication mode that supports two-way traffic but only one direction at a time is

Correct Answer: Correct answer is: (C) Half duplex.

Exam Relevance: AP Computer Science Principles, SAT Subject Test in Computer Science

Difficulty: Easy

Concept notes: Half duplex communication allows data to be transmitted in both directions but not simultaneously. This means that while data can travel in both directions, it can only do so one way at a time.

Common Mistakes: Students may confuse half duplex with full duplex, which allows simultaneous two-way communication.

Explanations: Half duplex communication supports bidirectional traffic but not at the same time. This means that while data can be sent and received, it cannot be done simultaneously. This characteristic distinguishes half duplex from full duplex, which allows simultaneous two-way communication, and from simplex, which only allows one-way communication.

Option Analysis:

Option A: Simplex communication only allows one-way traffic, not two-way.
Option B: Duplex typically refers to full duplex, which allows simultaneous two-way communication.
Option C: Half duplex allows two-way traffic but not simultaneously, fitting the description.
Option D: Multiplexing is a method of combining multiple signals for transmission, not a communication mode.

Mnemonic: Half duplex: Half the time, not both.

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Computer networking MCQ - Set 116

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