Computer networking MCQ – Change your future

41. Frequency range of human voice and audible to human ears is usually in the range of

Correct Answer: Correct answer is: (B) 400 Hz to 3.4 KHz.

Exam Relevance: GATE, GRE, IIT JEE

Difficulty: Easy

Concept notes: The frequency range of the human voice and what is audible to human ears is a fundamental concept in acoustics and audio engineering.

Common Mistakes: Students may confuse the frequency range of human voice with the range of radio frequencies or other non-audible ranges.

Explanations: The human voice typically ranges from about 85 Hz to 255 Hz for men and 165 Hz to 255 Hz for women. However, the audible range for human ears is generally from 20 Hz to 20,000 Hz. The given range of 400 Hz to 3.4 KHz falls within the audible range and covers the typical frequency range of human speech.

Option Analysis:

Option A: 200 KHz to 600 KHz is far above the audible range for human ears and is not relevant to human voice frequencies.
Option B: 400 Hz to 3.4 KHz is within the audible range and covers the typical frequency range of human speech.
Option C: 100 MHz to 400 MHz is in the radio frequency range and is not relevant to human voice or audible frequencies.
Option D: None of the above is incorrect as Option B is the correct range.

42. Which protocol reduces administrative overhead in a switched network by allowing the configuration of a new VLAN to be distributed to all the switches in a domain?

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

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

Difficulty: Easy

Concept notes: VTP (VLAN Trunking Protocol) allows the configuration of VLANs to be distributed across a network of switches, reducing administrative overhead.

Common Mistakes: Students may confuse VTP with STP (Spanning Tree Protocol), which is used to prevent loops in a network, not to manage VLAN configurations.

Explanations: VTP (VLAN Trunking Protocol) is designed to simplify VLAN management in a switched network. When a new VLAN is created on one switch, VTP can propagate this configuration to all other switches in the VTP domain, reducing the need for manual configuration on each switch. This feature significantly reduces administrative overhead and ensures consistency across the network.

Option Analysis:

Option A: STP (Spanning Tree Protocol) is used to prevent loops in a network, not to manage VLAN configurations.
Option B: VTP (VLAN Trunking Protocol) is the correct choice as it allows VLAN configurations to be distributed across a network of switches.
Option C: DHCP (Dynamic Host Configuration Protocol) is used for assigning IP addresses to devices, not for VLAN management.
Option D: ISL (Inter-Switch Link) is a trunking protocol used to carry traffic from multiple VLANs between switches, but it does not manage VLAN configurations.

Mnemonic: VTP: VLANs Traveling Protocol

43. Hypertext Transfer Protocol (HTTP) uses services of TCP on

Correct Answer: Correct answer is: (A) Well-known port 80.

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: Hypertext Transfer Protocol (HTTP) is a protocol used for transmitting web pages and other data over the internet. It relies on the services of the Transmission Control Protocol (TCP) to ensure reliable data transmission. HTTP uses a well-known port number to facilitate communication between clients and servers.

Common Mistakes: Students often confuse the port numbers used by different protocols. For example, they might mistakenly believe that HTTP uses port 81 or 82, which are not the standard ports for HTTP.

Explanations: HTTP uses well-known port 80 for communication. This port number is standardized and widely recognized for HTTP traffic. When a client (such as a web browser) sends a request to a server, it typically connects to port 80 on the server to retrieve web content.

Option Analysis:

Option A: Correct. HTTP uses well-known port 80.
Option B: Incorrect. Port 81 is not the standard port for HTTP.
Option C: Incorrect. Port 82 is not the standard port for HTTP.
Option D: Incorrect. Port 83 is not the standard port for HTTP.

Mnemonic: HTTP Port 80: "HTTP Port 80, that's the key to go."

44. Multipoint topology is

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

Exam Relevance: Computer Networks, Data Communication, Network Fundamentals

Difficulty: Easy

Concept notes: Multipoint topology refers to a network configuration where multiple devices are connected to a single communication line or medium.

Common Mistakes: Students may confuse multipoint topology with other network topologies such as star or ring, which have different connection patterns.

Explanations: In a bus topology, all devices are connected to a single communication line, which is a multipoint configuration. This allows multiple devices to communicate over a single shared medium, making it a multipoint topology.

Option Analysis:

Option A: Bus topology is a multipoint topology where all devices are connected to a single communication line.
Option B: Star topology is not a multipoint topology; it has a central hub to which all devices are connected.
Option C: Mesh topology is not a multipoint topology; it involves multiple connections between devices.
Option D: Ring topology is not a multipoint topology; it forms a closed loop where each device is connected to two others.

Mnemonic: Bus = Multiple points on a single line.

45. Which of the following is NOT considered a type of Internet connection?

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

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

Difficulty: Easy

Concept notes: The question asks for an option that is not a type of Internet connection. Internet connections are methods by which a device can connect to the Internet, such as wireless, cable, or mobile networks.

Common Mistakes: Students might mistakenly think that a server is a type of Internet connection because servers are often used in the context of Internet services and connectivity.

Explanations: A server is a computer system that provides data and services to other computers over a network. It is not a method of connecting to the Internet. Wireless, cable, and mobile are all types of Internet connections, whereas a server is a component of the network infrastructure that supports Internet services.

Option Analysis:

Option A: Wireless is a type of Internet connection, such as Wi-Fi.
Option B: Cable is a type of Internet connection, such as cable broadband.
Option C: Mobile is a type of Internet connection, such as 4G or 5G.
Option D: Server is not a type of Internet connection but a component of network infrastructure.

46. WiMAX provides

Correct Answer: Correct answer is: (C) Both VoIP services and IPTV services.

Exam Relevance: IEEE 802.16, Computer Networks, Telecommunications Engineering

Difficulty: Moderate

Concept notes: WiMAX (Worldwide Interoperability for Microwave Access) is a telecommunications technology that provides high-speed wireless data over long distances. It can support various services including VoIP (Voice over Internet Protocol) and IPTV (Internet Protocol Television).

Common Mistakes: Students may mistakenly believe that WiMAX only supports one type of service, such as VoIP or IPTV, but not both.

Explanations: WiMAX technology is capable of supporting multiple types of services due to its high bandwidth and robust data transmission capabilities. VoIP services require reliable and high-speed data transmission, which WiMAX can provide. Similarly, IPTV services, which involve streaming video content over the internet, also benefit from the high bandwidth and low latency provided by WiMAX. Therefore, WiMAX can support both VoIP and IPTV services.

Option Analysis:

Option A: WiMAX can support VoIP services, but this option does not account for its ability to support IPTV services as well.
Option B: WiMAX can support IPTV services, but this option does not account for its ability to support VoIP services as well.
Option C: WiMAX can support both VoIP and IPTV services, making this the correct answer.
Option D: This option is incorrect as WiMAX does support both VoIP and IPTV services.

Mnemonic: WiMAX: Voice and Video, Both Included

47. In SCTP, a data chunk is numbered using.....

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

Exam Relevance: Computer Networks, Data Communication, Network Protocols

Difficulty: Moderate

Concept notes: In SCTP (Stream Control Transmission Protocol), data chunks are numbered using Transmission Sequence Numbers (TSNs).

Common Mistakes: Students may confuse TSNs with other sequence numbers like Stream Identifiers (SI) or Stream Sequence Numbers (SSN), which are used for different purposes in SCTP.

Explanations: In SCTP, each data chunk is assigned a unique TSN to ensure reliable transmission. TSNs are used to track the order of data chunks and to detect any missing or out-of-order packets. This numbering scheme is crucial for the reliable delivery of data in SCTP.

Option Analysis:

Option A: Correct. TSNs are used to number data chunks in SCTP.
Option B: Incorrect. Stream Identifiers (SI) are used to identify different streams within an SCTP association, not to number data chunks.
Option C: Incorrect. Stream Sequence Numbers (SSN) are used to order data within a specific stream, not to number data chunks.
Option D: Incorrect. The correct answer is provided in option A.

Mnemonic: TSN tracks transmission, not streams.

48. We have categorized access methods into..... groups.

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

Exam Relevance: Computer Science Exams, Information Technology Exams, Database Management Exams

Difficulty: Moderate

Concept notes: Access methods are categorized into three main groups.

Common Mistakes: Students may confuse the number of groups with other classifications in related topics.

Explanations: Access methods are typically classified into three main groups: direct access, sequential access, and indexed access. Direct access allows data to be accessed directly without the need to read through preceding data. Sequential access requires data to be read sequentially from the beginning to the desired location. Indexed access uses an index to locate data directly, providing a balance between direct and sequential access methods.

Option Analysis:

Option A: Incorrect, as there are not two groups of access methods.
Option B: Correct, as access methods are categorized into three groups.
Option C: Incorrect, as there are not four groups of access methods.
Option D: Incorrect, as there are not five groups of access methods.

Mnemonic: Direct, Sequential, Indexed - DSI

49. Which of the following provides a storage mechanism for incoming mail but does not allow a user to download messages selectively?

Correct Answer: Correct answer is: (D) POP3.

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Moderate

Concept notes: POP3 (Post Office Protocol version 3) is a standard mail protocol used to retrieve emails from a mail server to a local device. It provides a storage mechanism for incoming mail but does not allow users to download messages selectively.

Common Mistakes: Students often confuse POP3 with IMAP, which allows selective downloading and synchronization of emails across multiple devices.

Explanations: POP3 stores incoming mail on a server until the user retrieves it. Once retrieved, the mail is typically deleted from the server, unless the user configures the client to leave a copy on the server. POP3 does not support selective downloading of messages; it downloads all messages in the mailbox. This contrasts with IMAP, which allows users to selectively download messages and manage them on multiple devices.

Option Analysis:

Option A: SMTP (Simple Mail Transfer Protocol) is used for sending emails, not for storing or downloading incoming mail.
Option B: DHCP (Dynamic Host Configuration Protocol) is used for assigning IP addresses to devices on a network and is unrelated to email storage or retrieval.
Option C: IMAP (Internet Message Access Protocol) allows users to selectively download and manage emails across multiple devices, which does not match the description in the question.
Option D: POP3 (Post Office Protocol version 3) provides a storage mechanism for incoming mail but does not allow selective downloading of messages, matching the description in the question.

50. A good polynomial generator of cyclic code have at least

Correct Answer: Correct answer is: (C) Two terms.

Exam Relevance: GATE, IEEE, ECE exams

Difficulty: Moderate

Concept notes: A good polynomial generator for cyclic codes must have at least two terms to ensure the code can detect and correct errors effectively.

Common Mistakes: Students often mistakenly believe that a single term is sufficient for generating cyclic codes, overlooking the need for multiple terms to ensure error detection and correction capabilities.

Explanations: A polynomial generator for cyclic codes must have at least two terms to ensure the code can detect and correct errors effectively. A single term would not provide the necessary redundancy and structure required for error detection and correction. Therefore, a polynomial with at least two terms is essential for generating a robust cyclic code.

Option Analysis:

Option A: A zero term polynomial is not a valid generator for cyclic codes as it would not provide any structure or redundancy.
Option B: A polynomial with only one term cannot generate a cyclic code that can effectively detect and correct errors.
Option C: A polynomial with at least two terms is necessary to ensure the code can detect and correct errors effectively.
Option D: While a polynomial with three terms can be used, it is not the minimum requirement. The minimum requirement is two terms.

Mnemonic: Two terms, two truths: detect and correct.

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Computer networking MCQ - Set 5

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