Computer networking MCQ – Change your future

651. Which protocol do many browsers assume when entering a URL in the address field?

Correct Answer: Correct answer is: (D) Http://.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: Web browsers assume the HTTP protocol when a URL is entered without a protocol prefix.

Common Mistakes: Students may mistakenly believe that browsers assume FTP or another protocol by default.

Explanations: When a user enters a URL without specifying a protocol, most web browsers automatically prepend "http://" to the URL. This is because HTTP is the standard protocol for accessing web pages over the internet. The browser assumes this protocol to ensure the user can access web content without needing to manually specify the protocol each time.

Option Analysis:

Option A: .net is a top-level domain, not a protocol.
Option B: .com is a top-level domain, not a protocol.
Option C: Ftp:// is a protocol, but it is not the default assumed by browsers for web content.
Option D: Http:// is the correct protocol assumed by browsers when no protocol is specified.

Mnemonic: HTTP: Hypertext Transfer Protocol, the default web protocol.

652. In..... methods, the stations consult one another to find which station has the right to send.

Correct Answer: Correct answer is: (B) Controlled access.

Exam Relevance: Computer Networks, Data Communication, Telecommunication Engineering

Difficulty: Moderate

Concept notes: In controlled access methods, stations communicate with each other to determine which station has the right to transmit.

Common Mistakes: Students may confuse controlled access with random access, where stations transmit without prior coordination.

Explanations: Controlled access methods involve coordination among stations to avoid collisions. Stations consult each other to determine which station has the right to send data. This ensures that only one station transmits at a time, preventing data collisions and ensuring efficient use of the communication channel.

Option Analysis:

Option A: Random access methods do not involve consultation among stations before transmitting. Instead, stations transmit whenever they have data to send, which can lead to collisions.
Option B: Controlled access methods involve consultation among stations to determine which station has the right to transmit, making this the correct answer.
Option C: Channelization involves dividing a communication channel into multiple sub-channels, but it does not involve consultation among stations to determine transmission rights.
Option D: This option is incorrect as controlled access is a valid method.

Mnemonic: Controlled Consultation Coordination

653. The value of the acknowledgment field in a segment defines the number of the.....byte a party expects to receive.

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

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Moderate

Concept notes: In TCP/IP communication, the acknowledgment field in a segment indicates the sequence number of the next byte the receiver expects to receive.

Common Mistakes: Students often confuse the acknowledgment field with the sequence number field, which indicates the sequence number of the first byte in the segment.

Explanations: The acknowledgment field in a TCP segment specifies the sequence number of the next byte the receiver expects to receive. This ensures that the sender knows which byte to send next, maintaining the order and integrity of the data transmission.

Option Analysis:

Option A: Incorrect, as the acknowledgment field does not indicate the first byte received.
Option B: Incorrect, as the acknowledgment field does not indicate the last byte received.
Option C: Correct, as the acknowledgment field indicates the next byte expected to be received.
Option D: Incorrect, as the acknowledgment field has a specific meaning in TCP/IP communication.

654. Function that is used to take a data packet from network layer is

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

Exam Relevance: Computer Networks, Data Communications, Network Protocols

Difficulty: Moderate

Concept notes: The function GetData() is used to retrieve a data packet from the network layer in a communication protocol stack.

Common Mistakes: Students may confuse GetData() with other functions like SendFrame() or MakeFrame(), which are used for different purposes in the protocol stack.

Explanations: In a communication protocol stack, the GetData() function is specifically designed to extract data packets from the network layer. This function is crucial for the Data Link Layer to receive and process incoming data packets. The other functions listed, such as WaitForEvent(), MakeFrame(), and SendFrame(), serve different purposes and are not used for retrieving data packets from the network layer.

Option Analysis:

Option A: WaitForEvent() is typically used to wait for an event to occur, not to retrieve data packets.
Option B: GetData() is the correct function for retrieving data packets from the network layer.
Option C: MakeFrame() is used to create a frame, not to retrieve data packets.
Option D: SendFrame() is used to send a frame, not to retrieve data packets.

655. The..... field in the SNMP PDU reports an error in a response message.

Correct Answer: Correct answer is: (C) Error status.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: In SNMP (Simple Network Management Protocol), the Error Status field in the PDU (Protocol Data Unit) is used to report errors in response messages.

Common Mistakes: Students may confuse the Error Status field with other fields in the PDU, such as the Community field, which is used for authentication.

Explanations: The Error Status field in the SNMP PDU is specifically designed to report errors in response messages. This field is crucial for identifying issues that occur during the communication process between the SNMP manager and the agent. The other fields in the PDU, such as the Community field, serve different purposes and do not report errors.

Option Analysis:

Option A: The Community field is used for authentication and does not report errors.
Option B: The Enterprise field is used to identify the vendor or organization and does not report errors.
Option C: The Error Status field is used to report errors in response messages.
Option D: This option is incorrect as the Error Status field is the correct answer.

656. 11a runs on what frequency?

Correct Answer: Correct answer is: (A) 5Ghz.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: The 11a standard operates on the 5GHz frequency band.

Common Mistakes: Students often confuse the 11a standard with the 11b or 11g standards, which operate on the 2.4GHz band.

Explanations: The 11a standard is part of the IEEE 802.11 wireless networking standards and specifically operates on the 5GHz frequency band. This is a well-established fact in wireless networking technology.

Option Analysis:

Option A: Correct, as 11a operates on the 5GHz frequency band.
Option B: Incorrect, as 2.4GHz is used by 11b and 11g standards.
Option C: Incorrect, as 4.8GHz is not a standard frequency for 11a.
Option D: Incorrect, as 3.6GHz is not a standard frequency for 11a.

Mnemonic: 5GHz for 11a, think "Five for Fast"

657. In cellular telephony each slot holds

Correct Answer: Correct answer is: (C) 324 Bits.

Exam Relevance: GATE, ECE, Wireless Communication Exams

Difficulty: Moderate

Concept notes: In cellular telephony, each slot in a time division multiple access (TDMA) system typically holds a specific number of bits. The correct number of bits per slot is crucial for understanding the capacity and structure of the communication system.

Common Mistakes: Students often confuse the number of bits per slot with other parameters in cellular systems, such as the number of bits per frame or the number of slots per frame.

Explanations: In TDMA systems used in cellular telephony, each time slot is designed to carry a specific amount of data. The correct number of bits per slot is 324 bits. This is a standard configuration in many cellular systems, ensuring efficient use of the available bandwidth and synchronization between different components of the network.

Option Analysis:

Option A: 320 Bits is incorrect as it does not match the standard configuration.
Option B: 322 Bits is incorrect as it does not match the standard configuration.
Option C: 324 Bits is the correct configuration for the number of bits per slot in cellular telephony.
Option D: 330 Bits is incorrect as it does not match the standard configuration.

658. Frame format of CSMA/CD and Ethernet protocol differ in the block.

Correct Answer: Correct answer is: (D) None of the above.

Exam Relevance: Computer Networks, Data Communications, Network Protocols

Difficulty: Moderate

Concept notes: CSMA/CD (Carrier Sense Multiple Access with Collision Detection) and Ethernet protocols share a similar frame format. Both include fields for preamble, start frame delimiter, destination and source MAC addresses, type/length, data, and frame check sequence (FCS). The key difference lies in the implementation and operation rather than the frame format itself.

Common Mistakes: Students often confuse the operational differences between CSMA/CD and Ethernet with differences in frame format. The operational differences, such as collision detection and handling, do not affect the frame format.

Explanations: The frame format of CSMA/CD and Ethernet protocols is essentially the same. Both protocols use a similar structure for their frames, including fields for preamble, start frame delimiter, destination and source MAC addresses, type/length, data, and frame check sequence (FCS). The differences between the two protocols are more related to their operational mechanisms, such as how they handle collisions, rather than the frame format. Therefore, the correct answer is "None of the above," as there is no significant difference in the frame format between CSMA/CD and Ethernet.

Option Analysis:

Option A: Error Control is not a distinguishing factor in the frame format between CSMA/CD and Ethernet.
Option B: Control block is not a specific component that differentiates the frame format of CSMA/CD and Ethernet.
Option C: PAD (Packet Assembler/Disassembler) is not a component of the frame format in either protocol.
Option D: None of the above is correct because the frame formats of CSMA/CD and Ethernet are essentially the same.

659. Term that is used to set standards to enable intercommunication among equipment from a variety of manufacturers is called

Correct Answer: Correct answer is: (A) Project 802.

Exam Relevance: IEEE Certification Exams, Network+ Certification, CCNA

Difficulty: Moderate

Concept notes: Project 802 is a set of standards for local area networks (LANs) and metropolitan area networks (MANs) that are maintained by the Institute of Electrical and Electronics Engineers (IEEE). These standards ensure compatibility and interoperability among different network devices and systems.

Common Mistakes: Students may confuse Project 802 with other IEEE projects or standards, such as those related to wireless networking or other technical specifications.

Explanations: Project 802 is the correct term used to set standards to enable intercommunication among equipment from a variety of manufacturers. These standards are crucial for ensuring that different devices can communicate effectively within a network, regardless of the manufacturer. The IEEE 802 standards cover various aspects of networking, including Ethernet, Wi-Fi, and token ring networks.

Option Analysis:

Option A: Correct. Project 802 is the IEEE standard for LAN and MAN protocols.
Option B: Incorrect. There is no known "Project 8802" in IEEE standards.
Option C: Incorrect. There is no known "Project 2088" in IEEE standards.
Option D: Incorrect. There is no known "Project 208" in IEEE standards.

Mnemonic: IEEE 802: "Eye-Ee-Ee Eight-Oh-Two"

660. Which one is an example of a LAN

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

Exam Relevance: CCNA, CompTIA Network+, ITIL Foundation

Difficulty: Moderate

Concept notes: A Local Area Network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, or small office.

Common Mistakes: Students may mistakenly believe that large organizations or internet giants like Google can be considered LANs, which is incorrect as LANs are typically confined to a small geographical area.

Explanations: A LAN is designed to cover a small area such as a school or a small organization. Google, being a large-scale internet company, operates on a much larger scale and uses Wide Area Networks (WANs) rather than LANs. Therefore, only options (A) and (B) are correct examples of LANs.

Option Analysis:

Option A: A School is a correct example of a LAN as it typically covers a small geographical area.
Option B: A Small Organisation is also a correct example of a LAN as it operates within a limited area.
Option C: Google is not a correct example of a LAN as it operates on a much larger scale and uses WANs.
Option D: This option correctly identifies (A) and (B) as examples of LANs.

Mnemonic: LAN: Local Area Network, think "Local" like "Local School or Office"

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Computer networking MCQ - Set 66

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