Computer networking MCQ

1231. Which two of the following commands will place network 10.2.3.0/24 into area 0? 1. router eigrp 10 2. router ospf 10 3. network 10.0.0.0 4. network 10.2.3.0 0.0.0.255 area0 5. network 10.2.3.0 0.0.0.255 area 0

Correct Answer: Correct answer is: (C) 2 and 5.

Exam Relevance: CCNA, CCNP, JNCIA, JNCIS

Difficulty: Moderate

Concept notes: The correct answer involves configuring OSPF to include a specific network in a particular area.

Common Mistakes: Students may confuse the commands for EIGRP and OSPF, leading to incorrect selection of commands.

Explanations: To place network 10.2.3.0/24 into area 0, the correct commands are: 1. "router ospf 10" - This command initiates the OSPF process with a process ID of 10. 2. "network 10.2.3.0 0.0.0.255 area 0" - This command specifies the network 10.2.3.0/24 and assigns it to area 0. The command "router eigrp 10" is for EIGRP, not OSPF, and thus is not relevant. The command "network 10.0.0.0" is too broad and does not specify the correct network or area. The command "network 10.2.3.0 0.0.0.255 area0" is incorrect due to the lack of space between "area" and "0".

Option Analysis:

Option A: Incorrect because it includes a command for EIGRP, which is not relevant for OSPF configuration.
Option B: Incorrect because it includes an incorrect network command and an incorrect area command.
Option C: Correct because it includes the correct OSPF command and the correct network and area command.
Option D: Incorrect because it includes a broad network command that does not specify the correct network or area.

1232. In Sonet network, a switch in a network mesh is called a

Correct Answer: Correct answer is: (A) Cross-Connect.

Exam Relevance: Networking exams, Telecommunications exams, Computer Science exams

Difficulty: Easy

Concept notes: In a Sonet network, a switch in a network mesh is referred to as a Cross-Connect.

Common Mistakes: Students may confuse Cross-Connect with other network components like switches or routers.

Explanations: A Cross-Connect in a Sonet network is a device that allows the switching and interconnection of signals between different transmission paths. It is a key component in the network mesh, facilitating the routing of data between different nodes.

Option Analysis:

Option A: Correct. Cross-Connect is the term used for a switch in a Sonet network mesh.
Option B: Incorrect. Cross-Switch is not a standard term in Sonet networks.
Option C: Incorrect. Cross-Communication is not a standard term in Sonet networks.
Option D: Incorrect. Cross-Cells is not a standard term in Sonet networks.

1233. Low Earth Orbit (LEO) satellites can be divided into

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

Exam Relevance: GATE, GRE, NASA exams, ISRO exams

Difficulty: Moderate

Concept notes: Low Earth Orbit (LEO) satellites are typically categorized into three main types based on their operational characteristics and applications.

Common Mistakes: Students may confuse the categories of LEO satellites with other classifications of satellites, such as those based on altitude or purpose.

Explanations: LEO satellites are generally divided into three categories: communication satellites, Earth observation satellites, and scientific satellites. Communication satellites are used for telecommunications, Earth observation satellites are used for monitoring and imaging the Earth's surface, and scientific satellites are used for various scientific research purposes. This categorization is based on the primary function and application of the satellites.

Option Analysis:

Option A: Incorrect, as LEO satellites are not divided into six categories.
Option B: Incorrect, as LEO satellites are not divided into four categories.
Option C: Correct, as LEO satellites are divided into three categories based on their primary functions.
Option D: Incorrect, as LEO satellites are not divided into two categories.

1234. Service, in which data can flow in both directions at same time in Transmission Control Protocol (TCP) is called

Correct Answer: Correct answer is: (B) Full-Duplex Communication.

Exam Relevance: Computer Networks, Data Communication, Network Fundamentals

Difficulty: Easy

Concept notes: Full-Duplex Communication allows data to flow in both directions simultaneously.

Common Mistakes: Students may confuse Full-Duplex with Half-Duplex, which only allows data to flow in one direction at a time.

Explanations: TCP supports Full-Duplex Communication, enabling simultaneous data transmission in both directions. This is essential for interactive applications where data needs to be sent and received concurrently.

Option Analysis:

Option A: Half-Duplex Communication only allows data to flow in one direction at a time, which is not the case for TCP.
Option B: Full-Duplex Communication allows data to flow in both directions simultaneously, which is the correct description for TCP.
Option C: Complex-Duplex Communication is not a standard term in networking and does not apply to TCP.
Option D: Dubly-Duplex Communication is not a standard term in networking and does not apply to TCP.

1235. The Term "FIREWALL" originated from ....., where a firewall is a barrier established to prevent the spread of fire.

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

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: The term "firewall" originally comes from the physical barrier used in firefighting to prevent the spread of fire.

Common Mistakes: Students might confuse the term with other fire-related activities or technologies.

Explanations: In firefighting, a firewall is a physical barrier designed to prevent the spread of fire from one area to another. This concept was later adopted in the field of computer security, where a firewall is a system designed to prevent unauthorized access to or from a private network. The term's origin in firefighting is the correct answer because it reflects the original use of the term in a physical context.

Option Analysis:

Option A: Correct. The term "firewall" originated from firefighting, where it refers to a physical barrier to prevent the spread of fire.
Option B: Incorrect. "Fireprevention" is a related concept but not the origin of the term "firewall."
Option C: Incorrect. "Firecasting" is not a recognized term in the context of fire safety or computer security.
Option D: Incorrect. "Firepower" refers to the capacity to use fire in combat or the intensity of fire, not the origin of the term "firewall."

1236. When was the Internet officially created?

Correct Answer: Correct answer is: (C) January 1983.

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

Difficulty: Moderate

Concept notes: The Internet officially came into existence in January 1983 when the ARPANET transitioned to the TCP/IP protocol, which is the fundamental communication protocol used by the Internet.

Common Mistakes: Students often confuse the creation of the Internet with the creation of the ARPANET, which was an early precursor to the Internet.

Explanations: The Internet officially came into existence in January 1983 when the ARPANET transitioned to the TCP/IP protocol. This transition marked the beginning of the modern Internet as we know it today. Prior to this, the ARPANET used the NCP protocol, which was not compatible with the diverse range of networks that would later form the Internet. The adoption of TCP/IP allowed for the interconnection of multiple networks, thus creating the Internet.

Option Analysis:

Option A: January 1962 is incorrect as this date predates the creation of the ARPANET, which was the precursor to the Internet.
Option B: June 1965 is incorrect as this date is still before the creation of the ARPANET and the development of the TCP/IP protocol.
Option C: January 1983 is correct as this is when the ARPANET transitioned to the TCP/IP protocol, marking the official creation of the Internet.
Option D: June 1987 is incorrect as the Internet was already in existence by this time.

1237. Which of the following is not an example of protocol?

Correct Answer: Correct answer is: (D) All are protocols.

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

Difficulty: Easy

Concept notes: Protocols are formalized conventions or standards that dictate how data is transmitted and received over a network. HTTP, POP, and FTP are all examples of protocols used in computer networking.

Common Mistakes: Students may mistakenly believe that one of the options is not a protocol, but in this case, all the listed options are indeed protocols.

Explanations: HTTP (Hypertext Transfer Protocol) is used for transferring web pages and other data over the internet. POP (Post Office Protocol) is used for retrieving emails from a mail server. FTP (File Transfer Protocol) is used for transferring files between computers on a network. Since all these are protocols, the correct answer is that all are protocols.

Option Analysis:

Option A: HTTP is a protocol used for web communication.
Option B: POP is a protocol used for email retrieval.
Option C: FTP is a protocol used for file transfer.
Option D: This option correctly states that all the listed items are protocols.

1238. A subdivision of main storage created by operational software is referred to as a:

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

Exam Relevance: Operating Systems, Computer Architecture, System Programming

Difficulty: Easy

Concept notes: A partition is a subdivision of main storage (memory) created by operational software to manage and allocate memory resources efficiently.

Common Mistakes: Students may confuse partitions with other memory management techniques such as segmentation or paging.

Explanations: In computer systems, main storage is often divided into partitions by the operating system to manage different processes or applications. This allows for better organization and control over memory usage. The term "partition" specifically refers to these subdivisions.

Option Analysis:

Option A: Correct. A partition is a subdivision of main storage created by operational software.
Option B: Incorrect. "Divided core" is not a standard term in computer memory management.
Option C: Incorrect. "Compartment" is not a standard term used in the context of main storage division.
Option D: Incorrect. "Time-shared program" refers to a scheduling technique, not a memory subdivision.

Mnemonic: P for Partition, P for Partitioning memory.

1239. Which of the following does not have a Net ID and Host ID?

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: Class D IP addresses are used for multicast communications and do not have a Net ID and Host ID in the traditional sense.

Common Mistakes: Students may confuse Class D with other classes that have a Net ID and Host ID.

Explanations: Class D IP addresses are reserved for multicast groups and do not follow the traditional structure of having a Net ID and Host ID. Instead, they are used to send packets to a group of hosts rather than a single host. Classes A, B, and C are structured with a Net ID and Host ID, but Class D is not.

Option Analysis:

Option A: Class A addresses have a Net ID and Host ID.
Option B: Class B addresses have a Net ID and Host ID.
Option C: Class C addresses have a Net ID and Host ID.
Option D: Class D addresses do not have a Net ID and Host ID.

Mnemonic: D for Direct (Multicast) - No Net ID, No Host ID

1240. Wireless transmission can be done via

Correct Answer: Correct answer is: (D) All of the mentioned.

Exam Relevance: GATE, GRE, ECE exams

Difficulty: Easy

Concept notes: Wireless transmission can be achieved through various mediums including radio waves, microwaves, and infrared.

Common Mistakes: Students may mistakenly believe that only one type of wave is used for wireless transmission.

Explanations: Wireless transmission can be performed using radio waves, which are commonly used for broadcasting and communication over long distances. Microwaves are used for shorter distances and higher frequencies, often in satellite communications and Wi-Fi. Infrared is used for short-range wireless communication, such as in remote controls and some wireless networking technologies. Therefore, all of these options are correct, making the answer "All of the mentioned."

Option Analysis:

Option A: Radio waves are a valid form of wireless transmission.
Option B: Microwaves are also a valid form of wireless transmission.
Option C: Infrared is another valid form of wireless transmission.
Option D: Since all the mentioned options are valid forms of wireless transmission, this is the correct answer.

Mnemonic: RMI - Radio, Microwaves, Infrared

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Computer networking MCQ - Set 124

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