Computer networking MCQ – Change your future

1. Way in which computer data is transmitted from one place to another is called

Correct Answer: Correct answer is: (A) Transmission mode.

Exam Relevance: GATE, GRE, CCNA

Difficulty: Easy

Concept notes: Transmission mode refers to the way data is transmitted from one point to another in a communication system.

Common Mistakes: Students may confuse transmission mode with transfer mode, which is not a standard term in data communication.

Explanations: Transmission mode is the correct term used to describe the method by which data is sent from one location to another. It encompasses various methods such as simplex, half-duplex, and full-duplex communication. The other options are not standard terms used in data communication.

Option Analysis:

Option A: Correct. Transmission mode is the correct term for the method of data transmission.
Option B: Incorrect. Transfer mode is not a standard term in data communication.
Option C: Incorrect. Sending mode is not a standard term in data communication.
Option D: Incorrect. Receiving mode is not a standard term in data communication.

2. Baseband transmission of a digital signal is possible only if we have a..... channel.

Correct Answer: Correct answer is: (A) Low-pass.

Exam Relevance: GATE, ECE, EE

Difficulty: Easy

Concept notes: Baseband transmission involves sending a signal without any modulation. This requires a channel that can pass the entire frequency range of the signal, which is typically a low-pass channel.

Common Mistakes: Students may confuse baseband transmission with passband transmission, which requires a bandpass channel.

Explanations: Baseband transmission involves sending a digital signal directly over a channel without any frequency modulation. For this to be possible, the channel must be able to pass the entire frequency range of the signal, which is typically a low-pass channel. A low-pass channel allows frequencies below a certain cutoff frequency to pass through, which is suitable for baseband signals that occupy a low-frequency range.

Option Analysis:

Option A: Correct. A low-pass channel is necessary for baseband transmission.
Option B: Incorrect. A bandpass channel is used for passband transmission, not baseband.
Option C: Incorrect. The rate of the channel is not relevant to the type of transmission.
Option D: Incorrect. The rate of the channel is not relevant to the type of transmission.

Mnemonic: Low-pass for baseband, like a low-pass filter.

3. This is an Internet Protocol (IP)-based storage networking standard for linking data storage facilities that can be used over existing Ethernet networks.

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Moderate

Concept notes: iSCSI (Internet Small Computer Systems Interface) is an IP-based standard for linking data storage facilities over existing Ethernet networks.

Common Mistakes: Students may confuse iSCSI with other storage networking technologies like Fibre Channel or NAS (Network Attached Storage).

Explanations: iSCSI is an Internet Protocol (IP)-based standard for linking data storage facilities over existing Ethernet networks. It allows storage devices to communicate over a network using the SCSI protocol encapsulated in IP packets. This makes it possible to connect storage devices over long distances and use existing network infrastructure, which is a key feature distinguishing it from other storage networking technologies.

Option Analysis:

Option A: NAT (Network Address Translation) is a method of reassigning IP addresses, not a storage networking standard.
Option B: RAID (Redundant Array of Independent Disks) is a data storage virtualization technology, not an IP-based networking standard.
Option C: ISCSI (Internet Small Computer Systems Interface) is the correct answer as it is an IP-based standard for linking data storage facilities over existing Ethernet networks.
Option D: NIC (Network Interface Card) is a hardware component that allows a computer to connect to a network, not a storage networking standard.

Mnemonic: ISCSI: Internet Storage, Connects Storage

4. The connection establishment procedure in TCP is susceptible to a serious security problem called the..... attack.

Correct Answer: Correct answer is: (C) SYN flooding.

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Moderate

Concept notes: The TCP connection establishment procedure, known as the three-way handshake, is vulnerable to SYN flooding attacks.

Common Mistakes: Students may confuse SYN flooding with other types of flooding attacks, such as ACK or FIN flooding, which target different stages of the TCP connection process.

Explanations: In a SYN flooding attack, an attacker sends a large number of TCP SYN (synchronize) requests to a server, but does not complete the three-way handshake. This causes the server to allocate resources for each connection attempt, which can exhaust the server's resources and prevent legitimate connections from being established. This attack specifically targets the initial stage of the TCP connection establishment, making SYN flooding the correct answer.

Option Analysis:

Option A: ACK flooding is not a common attack vector during the initial connection establishment phase of TCP.
Option B: FIN flooding targets the termination phase of a TCP connection, not the establishment phase.
Option C: SYN flooding targets the initial connection establishment phase, making it the correct answer.
Option D: This option is incorrect as SYN flooding is a recognized attack vector.

Mnemonic: SYN = Start Your Network, flooding it with SYN requests.

5. Lets you browse the internet and download material

Correct Answer: Correct answer is: (C) Hypertext Transfer Protocol (HTTP).

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: Hypertext Transfer Protocol (HTTP) is a protocol used for transmitting web pages and other content over the internet. It allows users to browse the internet and download material from websites.

Common Mistakes: Students may confuse HTTP with other protocols like FTP or SMTP, which have different primary functions.

Explanations: HTTP is specifically designed for browsing the internet and downloading material. It enables the transfer of data between a web server and a user's browser, making it the correct choice for the given context.

Option Analysis:

Option A: Transmission Control Protocol (TCP) is a lower-level protocol that ensures reliable data transmission but does not directly enable browsing or downloading material.
Option B: Simple Mail Transfer Protocol (SMTP) is used for sending email and is not related to browsing the internet or downloading material.
Option C: Hypertext Transfer Protocol (HTTP) is used for browsing the internet and downloading material, making it the correct answer.
Option D: File Transfer Protocol (FTP) is used for transferring files between computers but is not the primary protocol for browsing the internet.

Mnemonic: HTTP: HyperText for web browsing and downloading.

6. Consider the following Statements: A WNIC card provides a computer with wired network access. Every NIC ( network interface card) has a MAC and IP address. Transmission Control Protocol/Internet Protocol is designed to support Internet communication Which of the following statement(s) is/are true?

Correct Answer: Correct answer is: (C) Only 3.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: Transmission Control Protocol/Internet Protocol (TCP/IP) is designed to support Internet communication. This is a fundamental concept in networking.

Common Mistakes: Students may incorrectly assume that all NICs have both a MAC and IP address, or that a WNIC card provides wired network access.

Explanations: Statement 3 is true because TCP/IP is the protocol suite that enables communication over the Internet. Statements 1 and 2 are false. A WNIC (Wireless Network Interface Card) provides wireless network access, not wired. While every NIC has a MAC address, not every NIC has an IP address, as IP addresses are assigned by the network and can be dynamic or static.

Option Analysis:

Option A: Incorrect because statement 1 is false. A WNIC provides wireless, not wired, network access.
Option B: Incorrect because statement 2 is false. Not every NIC has an IP address.
Option C: Correct because only statement 3 is true.
Option D: Incorrect because statements 1 and 2 are false.

Mnemonic: TCP/IP: The Internet's backbone.

7. Which methods are commonly used in Server Socket class?

Correct Answer: Correct answer is: (B) Public Socket accept ().

Exam Relevance: Java Certification, Computer Science Exams, Programming Exams

Difficulty: Easy

Concept notes: The ServerSocket class in Java is used to create a server socket that listens for incoming client connections. The accept() method is a key method in the ServerSocket class that waits for a connection to be made to this socket and returns a new Socket object that represents that connection.

Common Mistakes: Students often confuse the methods of ServerSocket with those of Socket, leading to incorrect identification of methods specific to ServerSocket.

Explanations: The accept() method in the ServerSocket class is used to accept a connection from a client. This method blocks the calling thread until a connection is made. Once a connection is established, it returns a new Socket object that can be used to communicate with the client. This method is essential for server-side programming in Java, as it allows the server to handle incoming client connections.

Option Analysis:

Option A: The getOutputStream() method is not a method of the ServerSocket class. It is a method of the Socket class used to obtain an output stream to send data to the client.
Option B: The accept() method is a method of the ServerSocket class and is used to accept a connection from a client.
Option C: The close() method is a method of the ServerSocket class used to close the server socket, but it is not the method used to accept client connections.
Option D: This option is incorrect as the accept() method is a valid method of the ServerSocket class.

8. Propagation time is equals to

Correct Answer: Correct answer is: (A) Distance/Propagation speed.

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Easy

Concept notes: Propagation time is the time it takes for a signal to travel from the source to the destination over a given medium.

Common Mistakes: Students may confuse propagation time with transmission time, which is the time it takes to send the entire message over the medium.

Explanations: Propagation time is calculated as the distance the signal travels divided by the speed at which it propagates. This is because the time taken for a signal to travel a certain distance is directly proportional to the distance and inversely proportional to the speed of propagation.

Option Analysis:

Option A: This is the correct formula for propagation time.
Option B: Propagation speed divided by bandwidth does not represent propagation time.
Option C: Message size divided by bandwidth represents transmission time, not propagation time.
Option D: Bandwidth divided by queuing time is not a relevant formula for propagation time.

9. In AMPS, each band is divided into..... channels.

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

Exam Relevance: GATE, GRE, ECE Competitive Exams

Difficulty: Moderate

Concept notes: In AMPS (Advanced Mobile Phone System), the division of bands into channels is not standardized to a specific number like 800, 900, or 1000. The number of channels can vary based on the specific implementation and frequency band used.

Common Mistakes: Students may mistakenly believe that AMPS bands are uniformly divided into a fixed number of channels, such as 800, 900, or 1000, due to common frequency band designations in other communication systems.

Explanations: AMPS is a first-generation (1G) cellular technology that uses frequency-division multiple access (FDMA). The number of channels in AMPS is not fixed at 800, 900, or 1000. Instead, the number of channels can vary depending on the specific frequency band and implementation. Therefore, the correct answer is "None of the above."

Option Analysis:

Option A: 800 channels is not a standard division for AMPS bands.
Option B: 900 channels is not a standard division for AMPS bands.
Option C: 1000 channels is not a standard division for AMPS bands.
Option D: None of the above is correct as the number of channels in AMPS is not fixed to 800, 900, or 1000.

10. Type of signal which is mostly required by telephone lines is

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

Exam Relevance: Physics, Electronics, Telecommunications

Difficulty: Easy

Concept notes: Analog signals are continuous and vary in amplitude over time, making them suitable for transmitting voice signals over telephone lines.

Common Mistakes: Students may confuse digital signals with analog signals, thinking that digital signals are used in all modern communication systems.

Explanations: Analog signals are used in telephone lines because they can directly represent the continuous variations in sound waves. This allows for a more natural and accurate transmission of voice signals. Digital signals, on the other hand, are discrete and would require additional processing to convert voice signals into a digital format, which is not necessary for traditional telephone lines.

Option Analysis:

Option A: Digital signals are discrete and not suitable for directly representing continuous voice signals without additional processing.
Option B: Analog signals are continuous and directly represent voice signals, making them the correct choice for telephone lines.
Option C: Decimal is a number system and not a type of signal used in telephone lines.
Option D: Binary is a digital number system and not a type of signal used in telephone lines.

Mnemonic: Analog = Always Natural, Like Original, Genuine

Set 1Next Set ➡

Computer networking MCQ - Set 1

Leave a Reply