Computer networking MCQ

1081. Router operates in

Correct Answer: Correct answer is: (B) Network Layer.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: Routers operate at the Network Layer of the OSI model, which is responsible for routing packets between different networks.

Common Mistakes: Students often confuse routers with switches, which operate at the Data Link Layer.

Explanations: Routers are devices that operate at the Network Layer (Layer 3) of the OSI model. They are responsible for routing packets between different networks based on IP addresses. This function is distinct from the Data Link Layer (Layer 2) where switches operate, and the Transport Layer (Layer 4) where transport protocols like TCP and UDP operate.

Option Analysis:

Option A: Incorrect, as routers do not operate at the Data Link Layer.
Option B: Correct, as routers operate at the Network Layer.
Option C: Incorrect, as routers do not operate at the Transport Layer.
Option D: Incorrect, as routers do not operate at all layers.

1082. In File Transfer Protocol (FTP), a user needs an account (user name) and a password on the

Correct Answer: Correct answer is: (B) Remote Server.

Exam Relevance: Networking Exams, Computer Science Exams, IT Certification Exams

Difficulty: Easy

Concept notes: FTP requires a user to have an account and password on the server they are connecting to, which is typically a remote server.

Common Mistakes: Students may confuse the concept with local or central server requirements, thinking the account and password are needed on a server they control or a central authority.

Explanations: FTP is used to transfer files between a local computer and a remote server. To access the remote server, a user must have a valid account and password on that specific remote server. This ensures secure access and proper authentication for file transfer operations.

Option Analysis:

Option A: Incorrect because the account and password are not required on the same server as the local machine.
Option B: Correct because FTP requires authentication on the remote server where the files are stored or to be transferred.
Option C: Incorrect because there is no concept of a central server in FTP that requires user accounts and passwords.
Option D: Incorrect because the term "Data Host" is not standard in FTP terminology and does not specifically refer to the server requiring user credentials.

Mnemonic: FTP = Far To Place, Remote Server Required

1083. Dan finished a meeting early with a client and wants to catch up on his e-mails from work. Dan notices that the local coffee shop has free wi-fi access. What network hardware is allowing Dan to connect his computer to the wi-fi network?

Correct Answer: Correct answer is: (B) Access Point.

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Moderate

Concept notes: An access point is a device that allows wireless devices to connect to a wired network. It acts as a bridge between the wireless and wired networks.

Common Mistakes: Students may confuse an access point with a router, as both can be used to connect devices to a network. However, a router typically handles routing between different networks, while an access point primarily provides wireless connectivity.

Explanations: An access point is the network hardware that allows Dan to connect his computer to the wi-fi network. It provides the wireless connectivity needed for Dan's computer to communicate with the local coffee shop's network.

Option Analysis:

Option A: A router is used to connect multiple networks together and route traffic between them, but it does not directly provide wireless connectivity.
Option B: An access point is the correct choice as it provides the wireless connectivity needed for Dan's computer to connect to the network.
Option C: A gateway is a device that connects two different networks, but it does not provide wireless connectivity.
Option D: A switch is used to connect multiple devices within a single network, but it does not provide wireless connectivity.

Mnemonic: AP for Access Point, think "Airplane Port" for wireless connection.

1084. A network was established between one computerlocated in California and three computers located in Utah in the year.....

Correct Answer: Correct answer is: (A) 1969.

Exam Relevance: Computer Science, Information Technology, Networking Exams

Difficulty: Easy

Concept notes: The establishment of a network between one computer in California and three computers in Utah in 1969 is a significant milestone in the history of computer networking, marking the beginning of ARPANET, the precursor to the modern Internet.

Common Mistakes: Students may confuse the year with other significant dates in computer history, such as the establishment of the first email in 1971 or the creation of the World Wide Web in 1989.

Explanations: The correct answer is 1969 because this was the year when the first successful message was sent over ARPANET, connecting a computer at UCLA with a computer at Stanford Research Institute. This event is considered the birth of the Internet as we know it today.

Option Analysis:

Option A: Correct, as 1969 marks the establishment of ARPANET.
Option B: Incorrect, as 1971 is the year the first email was sent, not the establishment of the network.
Option C: Incorrect, as 1966 predates the establishment of ARPANET.
Option D: Incorrect, as the correct year is 1969.

Mnemonic: ARPANET, 1969, Internet's Birth

1085. UDP is called a.....transport protocol.

Correct Answer: Correct answer is: (C) Connectionless, unreliable.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: UDP (User Datagram Protocol) is a transport layer protocol that does not establish a connection before sending data. It is also unreliable because it does not guarantee delivery of packets.

Common Mistakes: Students often confuse UDP with TCP (Transmission Control Protocol), which is connection-oriented and reliable.

Explanations: UDP is connectionless because it does not require a connection to be established before sending data. It is unreliable because it does not ensure that packets are delivered or in the correct order. This makes UDP suitable for applications where speed is more important than reliability, such as real-time video streaming or online gaming.

Option Analysis:

Option A: Incorrect because UDP is not reliable.
Option B: Incorrect because UDP is not connection-oriented.
Option C: Correct because UDP is both connectionless and unreliable.
Option D: Incorrect because the correct answer is provided.

1086. In IPv4 protocol, size of source and destination address is

Correct Answer: Correct answer is: (D) 32 Bit.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: In IPv4, the source and destination addresses are 32-bit long, which is equivalent to 4 bytes.

Common Mistakes: Students may confuse IPv4 with IPv6, where addresses are 128 bits long.

Explanations: IPv4 addresses are 32 bits long, which is a standard format for IPv4 addressing. This is a fundamental aspect of the IPv4 protocol, ensuring compatibility and consistency across all IPv4 networks.

Option Analysis:

Option A: 64 Bit is incorrect as IPv4 addresses are not 64 bits long.
Option B: 16 Bit is incorrect as IPv4 addresses are not 16 bits long.
Option C: 128 bits long is incorrect as this is the size of IPv6 addresses, not IPv4.
Option D: 32 Bit is correct as IPv4 addresses are 32 bits long.

Mnemonic: IPv4 = 4 bytes = 32 bits

1087. Which of the following is private IP address?

Correct Answer: Correct answer is: (D) 192.168.24.43.

Difficulty: Moderate

Concept notes: Private IP addresses are reserved for use in private networks and are not routable on the public internet. The ranges for private IP addresses are 10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255, and 192.168.0.0 to 192.168.255.255.

Common Mistakes: Students often confuse the ranges of private IP addresses, particularly the 172.16.0.0 to 172.31.255.255 range, which can lead to incorrect identification of private IP addresses.

Explanations: The IP address 192.168.24.43 falls within the range of 192.168.0.0 to 192.168.255.255, which is designated for private networks. Therefore, it is a private IP address.

Option Analysis:

Option A: 12.0.0.1 is not within any of the private IP address ranges.
Option B: 168.172.19.39 is not within any of the private IP address ranges.
Option C: 172.15.14.36 is not within the 172.16.0.0 to 172.31.255.255 range, so it is not a private IP address.
Option D: 192.168.24.43 is within the 192.168.0.0 to 192.168.255.255 range, making it a private IP address

1088. This transmission medium is omnidirectional

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

Exam Relevance: GATE, ECE, EE, Wireless Communication Exams

Difficulty: Moderate

Concept notes: Radiowaves are omnidirectional, meaning they propagate in all directions from the source.

Common Mistakes: Students may confuse radiowaves with infrared or microwave, which are often used in more directional applications.

Explanations: Radiowaves are omnidirectional because they spread out uniformly in all directions from the transmitting antenna. This property makes them suitable for applications where coverage in a wide area is required, such as broadcasting and communication over large distances.

Option Analysis:

Option A: Microwave is not omnidirectional; it is typically used in point-to-point communication and is more directional.
Option B: Infrared is often used in point-to-point communication and is not omnidirectional.
Option C: Radiowaves are omnidirectional, making them suitable for wide-area coverage.
Option D: Fiber-optics is a guided medium and not omnidirectional; it transmits light along a fiber.

Mnemonic: RADIO: Radiowaves Are Directionless In Omnidirectional.

1089. Type of network in which whole network is established at a single place is classified as

Correct Answer: Correct answer is: (A) Local area network.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

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

Common Mistakes: Students may confuse LAN with other types of networks like WAN (Wide Area Network) or MAN (Metropolitan Area Network), which cover larger geographical areas.

Explanations: A local area network (LAN) is established within a single location, such as a building or campus. This makes it the correct classification for a network that is entirely set up in one place. Other network types like WAN or MAN cover larger geographical areas, which do not fit the description of being established at a single place.

Option Analysis:

Option A: Correct. A LAN is a network established within a single location.
Option B: Incorrect. "Banned area network" is not a recognized network type.
Option C: Incorrect. "Connected area network" is not a recognized network type.
Option D: Incorrect. "Timed area network" is not a recognized network type.

Mnemonic: LAN: Local Area Network

1090. What is interframe gap?

Correct Answer: Correct answer is: (A) Idle time between frames.

Exam Relevance: Computer Networks, Data Communication, Network Fundamentals

Difficulty: Easy

Concept notes: Interframe gap refers to the idle time between the transmission of frames in a network.

Common Mistakes: Students may confuse interframe gap with the idle time between bits within a frame or between packets.

Explanations: Interframe gap is the period of inactivity between the transmission of two consecutive frames. This idle time ensures that the network has sufficient time to process the previous frame before the next one is transmitted, preventing collisions and ensuring proper frame reception.

Option Analysis:

Option A: Correct. Interframe gap is the idle time between frames.
Option B: Incorrect. Idle time between frame bits is not the interframe gap.
Option C: Incorrect. Idle time between packets is not the interframe gap.
Option D: Incorrect. The correct answer is provided.

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Computer networking MCQ - Set 109

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