Computer networking MCQ

1101. LAN or WAN?A college is installing a new computer room on its campus.

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

Exam Relevance: Networking Fundamentals, CCNA, CompTIA Network+

Difficulty: Easy

Concept notes: A LAN (Local Area Network) is used to connect devices within a limited geographical area, such as a college campus.

Common Mistakes: Students may confuse LAN with WAN, thinking that a college campus would require a WAN due to its size.

Explanations: A LAN is appropriate for connecting devices within a college campus because it covers a limited geographical area. A WAN (Wide Area Network) is used for connecting devices over a larger geographical area, such as different cities or countries. Since the new computer room is being installed on the same campus, a LAN is the correct choice.

Option Analysis:

Option A: Correct. A LAN is suitable for connecting devices within a college campus.
Option B: Incorrect. A WAN is used for larger geographical areas, not within a single campus.
Option C: Incorrect. Only LAN is appropriate for the given scenario.
Option D: Incorrect. LAN is the correct choice for the scenario.

Mnemonic: LAN = Local Area Network

1102. Which one of the following feature was present in SSH protocol, version 1?

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

Exam Relevance: CISSP, CompTIA Security+, Network+

Difficulty: Moderate

Concept notes: SSH version 1 had several security vulnerabilities and lacked some features present in later versions.

Common Mistakes: Students may incorrectly assume that SSH version 1 included all the features of later versions.

Explanations: SSH version 1 did not include password changing, periodic replacement of session keys, or support for public-key certificates. These features were introduced in later versions of SSH to improve security and functionality.

Option Analysis:

Option A: Password changing was not a feature in SSH version 1.
Option B: Periodic replacement of session keys was not implemented in SSH version 1.
Option C: Support for public-key certificates was not available in SSH version 1.
Option D: This is the correct answer as none of the mentioned features were present in SSH version 1.

1103. In adaptive delta modulation, for better performance, value of delta is

Correct Answer: Correct answer is: (B) Not fixed.

Exam Relevance: Digital Communications, Signal Processing, Telecommunications Engineering

Difficulty: Moderate

Concept notes: In adaptive delta modulation, the value of delta is adjusted dynamically based on the signal characteristics to improve performance.

Common Mistakes: Students often mistakenly believe that delta should be a fixed value for consistency, but this does not account for varying signal conditions.

Explanations: Adaptive delta modulation adjusts the step size (delta) dynamically to match the signal's characteristics. This allows for better performance by reducing quantization error in regions where the signal changes rapidly and conserving bits in regions where the signal is relatively constant. A fixed delta would not adapt to these changes, leading to suboptimal performance.

Option Analysis:

Option A: A fixed delta would not adapt to varying signal conditions, leading to poor performance.
Option B: Not fixed, as the delta is adjusted dynamically to match the signal characteristics, improving performance.
Option C: An infinite delta is not practical and would not provide any meaningful quantization.
Option D: A zero delta would not allow any quantization and would result in no signal representation.

1104. Which two commands are required for basic OSPF configuration?

Correct Answer: Correct answer is: (D) Both Network ip-address wildcard-mask area area-id and Router ospf process-id.

Exam Relevance: CCNA, CCNP, JNCIA

Difficulty: Moderate

Concept notes: The correct answer involves understanding the basic configuration commands required for OSPF (Open Shortest Path First) in a network environment.

Common Mistakes: Students often confuse the wildcard-mask with the subnet mask, leading to incorrect configuration.

Explanations: To configure OSPF, two essential commands are required: the "router ospf process-id" command to enable OSPF and specify the process ID, and the "network ip-address wildcard-mask area area-id" command to specify the network and area for OSPF. The wildcard-mask is used to define the network range, and the area-id specifies the OSPF area to which the network belongs.

Option Analysis:

Option A: Incorrect because it uses a subnet mask instead of a wildcard mask.
Option B: Correct part of the answer, but not complete on its own.
Option C: Correct part of the answer, but not complete on its own.
Option D: Correct as it includes both necessary commands for basic OSPF configuration.

1105. Which network covers the smallest geographic area?

Correct Answer: Correct answer is: (A) Personal Area Network.

Exam Relevance: IT Essentials, CompTIA A+, Network+

Difficulty: Easy

Concept notes: Personal Area Networks (PANs) are the smallest type of network, typically covering a very limited area such as a single room or a person's immediate surroundings.

Common Mistakes: Students may confuse the size of a Personal Area Network with that of a Local Area Network (LAN), which covers a larger area such as a home or office.

Explanations: A Personal Area Network (PAN) is designed to connect devices in a very small area, such as within a person's workspace or immediate vicinity. This makes it the smallest network type among the options provided. A Wide Area Network (WAN) covers a large geographical area, such as a city or country, while a Local Area Network (LAN) covers a smaller area, such as a single building or campus. Therefore, the Personal Area Network (PAN) is the correct answer as it covers the smallest geographic area.

Option Analysis:

Option A: Correct. A Personal Area Network (PAN) covers the smallest geographic area, typically within a person's immediate surroundings.
Option B: Incorrect. A Wide Area Network (WAN) covers a large geographic area, such as a city or country.
Option C: Incorrect. A Local Area Network (LAN) covers a smaller area than a WAN but larger than a PAN, such as a single building or campus.
Option D: Incorrect. This option is not applicable as the correct answer is among the other options.

Mnemonic: PAN is Personal, so it's Personal and Small.

1106. This layer is concerned with specifying the characteristics of the transmission medium, the nature of the signals, the data rate, and related matters. This is defined as a:

Correct Answer: Correct answer is: (A) Physical layer.

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Easy

Concept notes: The physical layer is responsible for the physical transmission of data over a communication channel.

Common Mistakes: Students may confuse the physical layer with the data link layer, which deals with error detection and correction.

Explanations: The physical layer is concerned with the physical characteristics of the transmission medium, such as the type of signals, data rate, and other related matters. This layer is the lowest layer in the OSI model and is responsible for the actual transmission of raw bit streams over a physical medium.

Option Analysis:

Option A: Correct. The physical layer deals with the physical transmission of data.
Option B: Incorrect. The network layer is responsible for routing and addressing.
Option C: Incorrect. The transport layer is responsible for end-to-end communication and error recovery.
Option D: Incorrect. The application layer is the highest layer and deals with user applications and services.

1107. SNMP defines the..... to be sent from a manager to an agent and vice versa.

Correct Answer: Correct answer is: (A) Format of the packets.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: SNMP (Simple Network Management Protocol) defines the format of the packets to be sent from a manager to an agent and vice versa.

Common Mistakes: Students may confuse the format of the packets with the encoding or the number of packets, which are not defined by SNMP.

Explanations: SNMP is a protocol used for network management. It defines the structure and format of the packets that are exchanged between a manager and an agent. The format includes the structure of the data, such as the type of information being sent, the source and destination addresses, and the protocol version. This ensures that both the manager and the agent can understand and process the information correctly.

Option Analysis:

Option A: Correct. SNMP defines the format of the packets.
Option B: Incorrect. SNMP does not define the encoding of the packets.
Option C: Incorrect. SNMP does not define the number of packets.
Option D: Incorrect. This is not the correct answer.

1108. Which AAL type is designed to support a data stream that has a constant bit rate?

Correct Answer: Correct answer is: (A) AAL1.

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Easy

Concept notes: AAL1 is designed to support constant bit rate (CBR) data streams, which are typical in applications like voice and video.

Common Mistakes: Students may confuse AAL1 with AAL2, which is designed for variable bit rate (VBR) data streams.

Explanations: AAL1 is specifically designed to support constant bit rate (CBR) data streams. This makes it suitable for applications that require a steady and predictable data flow, such as voice and video transmission. AAL1 ensures that the data is transmitted at a consistent rate, which is crucial for real-time applications where timing is critical.

Option Analysis:

Option A: AAL1 is correct because it supports constant bit rate (CBR) data streams.
Option B: AAL2 is designed for variable bit rate (VBR) data streams, not CBR.
Option C: AAL3/4 is designed for connection-oriented services and is not specifically for CBR data streams.
Option D: AAL5 is designed for data transfer and is not specifically for CBR data streams.

Mnemonic: AAL1 = Always At a Level (Constant)

1109. A software or hardware that checks information coming from the Internet and depending on the applied configuration settings either blocks it or allows it to pass through is called:

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

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Moderate

Concept notes: A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.

Common Mistakes: Students may confuse a firewall with antivirus software, which primarily focuses on detecting and removing malicious software rather than controlling network traffic.

Explanations: A firewall checks information coming from the Internet and either blocks it or allows it to pass through based on the applied configuration settings. This function aligns with the description provided in the question. Antivirus software, antispyware, and malware are different types of security tools that do not specifically monitor and control network traffic in the same way a firewall does.

Option Analysis:

Option A: Antivirus software primarily focuses on detecting and removing malicious software, not on controlling network traffic.
Option B: A firewall monitors and controls network traffic based on security rules, fitting the description in the question.
Option C: Antispyware is designed to prevent spyware from infecting a computer, not to control network traffic.
Option D: Malware is a type of malicious software, not a security tool that controls network traffic.

Mnemonic: Firewall: Filter and Restrict Internet Web Access

1110. Connection-based protocol that makes sure data reaches its destination without any errors.

Correct Answer: Correct answer is: (A) Transmission Control Protocol (TCP).

Exam Relevance: Networks, Computer Science, IT Exams

Difficulty: Easy

Concept notes: Transmission Control Protocol (TCP) is a connection-based protocol that ensures reliable data transmission over the internet.

Common Mistakes: Students may confuse TCP with other protocols like HTTP or FTP, which are not connection-based and do not guarantee error-free data transmission.

Explanations: TCP establishes a connection between sender and receiver before data transmission begins. It ensures that data packets are delivered in the correct order and without errors by using acknowledgments and retransmissions. This makes TCP a reliable protocol for applications that require error-free data transmission.

Option Analysis:

Option A: Correct. TCP is a connection-based protocol that ensures reliable data transmission.
Option B: Incorrect. SMTP is a protocol used for sending email messages and does not ensure error-free data transmission.
Option C: Incorrect. HTTP is a protocol used for transferring web pages and does not ensure error-free data transmission.
Option D: Incorrect. FTP is a protocol used for transferring files and does not ensure error-free data transmission.

Mnemonic: TCP: Trusty Connection Protocol

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Computer networking MCQ - Set 111

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