Computer networking MCQ – Change your future

611. Interference susceptibility will be nil in which cable?

Correct Answer: Correct answer is: (C) OPTICAL FIBER.

Exam Relevance: GATE, GRE, ECE exams

Difficulty: Easy

Concept notes: Optical fiber cables use light to transmit data, which is not susceptible to electromagnetic interference.

Common Mistakes: Students may confuse twisted pair or coaxial cables with optical fiber, thinking they also have high interference resistance.

Explanations: Optical fiber cables transmit data using light pulses rather than electrical signals. Since light is not affected by electromagnetic fields, optical fibers are immune to electromagnetic interference. This makes them highly suitable for environments with high levels of electromagnetic interference.

Option Analysis:

Option A: Twisted pair cables are susceptible to electromagnetic interference due to their use of electrical signals.
Option B: Coaxial cables have some shielding against interference but are not completely immune to it.
Option C: Optical fiber cables use light for data transmission, which is not affected by electromagnetic interference.
Option D: None of the above is incorrect because optical fiber cables are indeed immune to interference.

Mnemonic: Light travels, no interference.

612. Which protocol is responsible for sending/receiving packets over the internet?

Correct Answer: Correct answer is: (C) TCP/IP.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: TCP/IP is the fundamental protocol suite used for sending and receiving packets over the internet.

Common Mistakes: Students often confuse application layer protocols like HTTP or FTP with the underlying transport and network layer protocols.

Explanations: TCP/IP is responsible for the transmission of data packets over the internet. It includes protocols for addressing, routing, and error checking, which are essential for reliable communication. Other options like HTTP, FTP, and IMAP are application layer protocols that use TCP/IP for their underlying data transmission.

Option Analysis:

Option A: HTTP is an application layer protocol used for web browsing, not for sending/receiving packets over the internet.
Option B: FTP is an application layer protocol used for file transfer, not for sending/receiving packets over the internet.
Option C: TCP/IP is the correct answer as it is the protocol suite responsible for sending and receiving packets over the internet.
Option D: IMAP is an application layer protocol used for email retrieval, not for sending/receiving packets over the internet.

613. Which layer of the OSI reference model does PPTP work at?

Correct Answer: Correct answer is: (B) Layer 2.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: PPTP (Point-to-Point Tunneling Protocol) operates at Layer 2 of the OSI model, which is the Data Link Layer.

Common Mistakes: Students may confuse PPTP with other tunneling protocols that operate at different layers, such as IPsec which operates at Layer 3.

Explanations: PPTP encapsulates Point-to-Point Protocol (PPP) frames within IP packets, which is a function of the Data Link Layer (Layer 2). This layer is responsible for establishing and maintaining links between nodes on the same network segment. PPTP creates a tunnel at this layer to encapsulate and transmit PPP traffic over an IP network.

Option Analysis:

Option A: Incorrect, as Layer 1 is the Physical Layer, which deals with the physical transmission of data.
Option B: Correct, as Layer 2 is the Data Link Layer, where PPTP operates.
Option C: Incorrect, as Layer 3 is the Network Layer, which handles routing and IP addressing.
Option D: Incorrect, as Layer 4 is the Transport Layer, which manages end-to-end communication.

614. In a multiplayer game center, we can found 2 or more devices which help to connect multiple devices and makes it work as a single netwok. What are they ?

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

Exam Relevance: CCNA, CompTIA Network+, A+ Certification

Difficulty: Moderate

Concept notes: A hub is a networking device that connects multiple devices on a network and allows them to communicate with each other.

Common Mistakes: Students may confuse a hub with a switch or router, which also connect devices but operate differently.

Explanations: A hub is the correct answer because it is a device that connects multiple devices in a network, allowing them to communicate as a single network. A hub operates at the physical layer of the OSI model and simply forwards data to all connected devices, making it suitable for connecting multiple devices in a multiplayer game center.

Option Analysis:

Option A: WIFI is a wireless technology for connecting devices but does not function as a central connecting device like a hub.
Option B: Hub is the correct answer as it connects multiple devices and allows them to communicate as a single network.
Option C: NIC (Network Interface Card) is a hardware component that allows a device to connect to a network but does not connect multiple devices.
Option D: Satellite is used for long-distance communication and does not function as a local network connecting device.

Mnemonic: Hub: Helps Unite Bunches

615. Metropolitan area network

Correct Answer: Correct answer is: (B) networks that serve an area of 1 to 30 miles, approximately the size of a typical city.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Moderate

Concept notes: A metropolitan area network (MAN) is a network that spans a larger geographic area than a local area network (LAN) but smaller than a wide area network (WAN). It typically covers a city or a large campus.

Common Mistakes: Students may confuse MAN with LAN or WAN due to the overlapping nature of network sizes and the varying definitions used in different contexts.

Explanations: The correct answer is B because a metropolitan area network (MAN) is designed to cover a geographic area of 1 to 30 miles, which is typically the size of a city. This distinguishes it from LANs, which are smaller in scale, and WANs, which cover much larger areas.

Option Analysis:

Option A: This describes a local area network (LAN), which is smaller in scale than a MAN.
Option B: This correctly describes a metropolitan area network (MAN).
Option C: This describes a wide area network (WAN), which covers a much larger geographic area than a MAN.
Option D: This describes a personal area network (PAN), which is much smaller in scale than a MAN.

Mnemonic: MAN: Metropolitan Area Network, think "City-wide Network"

616. Convergence Sublayer (CS) header and trailer consist of six fields, in layer

Correct Answer: Correct answer is: (C) AAL3/4.

Exam Relevance: Computer Networks, Data Communications, Network Protocols

Difficulty: Moderate

Concept notes: The Convergence Sublayer (CS) header and trailer in ATM (Asynchronous Transfer Mode) networks are part of the AAL3/4 (ATM Adaptation Layer 3/4) protocol.

Common Mistakes: Students often confuse the different AAL layers and their functions, particularly AAL3/4 with AAL5, which also deals with segmentation and reassembly but has a different structure.

Explanations: AAL3/4 is designed to handle both connection-oriented and connectionless services. The CS header and trailer in AAL3/4 are used to manage the segmentation and reassembly of data. The header and trailer contain fields such as the Protocol Control Information (PCI), which includes the Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI), and the Segmentation and Reassembly (SAR) fields. These fields are essential for ensuring that data is correctly segmented and reassembled at the receiving end.

Option Analysis:

Option A: AAL1 is used for constant bit rate (CBR) services and does not include the CS header and trailer as described.
Option B: AAL2/3 is not a standard AAL layer; AAL2 is used for variable bit rate (VBR) services and does not include the CS header and trailer as described.
Option C: AAL3/4 is the correct layer that includes the CS header and trailer with the necessary fields for segmentation and reassembly.
Option D: AAL5 is used for data transfer and includes a different structure for the trailer, specifically the Cyclic Redundancy Check (CRC), which is not part of the CS header and trailer described.

617. Every network that interconnects more than two devices also requires some mechanism to deliver each packet to the correct destination, the associated function is referred to as

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Moderate

Concept notes: Routing is the process of selecting paths in a network along which to send network traffic.

Common Mistakes: Students may confuse routing with transmission time, which is the duration it takes for a packet to travel from source to destination.

Explanations: In a network with more than two devices, packets must be delivered to the correct destination. Routing is the mechanism that determines the best path for packets to travel from the source to the destination. It involves the use of routing tables and algorithms to make these decisions. Transmission time, link injection bandwidth, and IP offload do not directly address the function of delivering packets to the correct destination.

Option Analysis:

Option A: Transmission time refers to the duration it takes for a packet to travel from source to destination, not the mechanism for delivering packets to the correct destination.
Option B: Routing is the correct mechanism for delivering packets to the correct destination in a network with more than two devices.
Option C: Link injection bandwidth refers to the capacity of a link to inject data into the network, not the mechanism for delivering packets to the correct destination.
Option D: IP offload refers to the process of offloading IP processing tasks to specialized hardware, not the mechanism for delivering packets to the correct destination.

Mnemonic: R - Route, R - Right path, R - Routing

618. Caeser cipher is represented as.....

Correct Answer: Correct answer is: (D) C = (p+3)mod26.

Exam Relevance: Cryptography exams, Information Security exams, Computer Science exams

Difficulty: Easy

Concept notes: The Caesar cipher is a type of substitution cipher where each letter in the plaintext is shifted a certain number of places down the alphabet. In this case, the shift is 3 places.

Common Mistakes: Students may confuse the modulus operation with a different number, such as 3 instead of 26, or they might use subtraction instead of addition.

Explanations: The Caesar cipher shifts each letter in the plaintext by a fixed number of positions. Here, the shift is 3 positions. The modulus operation ensures that the shift wraps around the alphabet, which has 26 letters. Thus, the formula C = (p+3)mod26 correctly represents the Caesar cipher with a shift of 3.

Option Analysis:

Option A: Incorrect because the modulus should be 26, not 3.
Option B: Incorrect because the shift is 3, not 26, and the modulus should be 26.
Option C: Incorrect because it uses subtraction instead of addition.
Option D: Correct because it correctly represents a Caesar cipher with a shift of 3 and a modulus of 26.

619. An IPv6 address is

Correct Answer: Correct answer is: (D) 128 bits long.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: IPv6 addresses are 128 bits long, which is significantly longer than IPv4 addresses, allowing for a much larger number of unique addresses.

Common Mistakes: Students often confuse the length of IPv6 addresses with IPv4 addresses, which are 32 bits long.

Explanations: IPv6 addresses are designed to be 128 bits long to accommodate the growing number of devices that require unique IP addresses. This length provides a vast address space, ensuring that the internet can continue to expand without running out of addresses.

Option Analysis:

Option A: 8 bits is far too short for an IPv6 address.
Option B: 16 bits is also too short for an IPv6 address.
Option C: 32 bits is the length of an IPv4 address, not an IPv6 address.
Option D: 128 bits is the correct length for an IPv6 address.

620. All IP addresses are divided into network address and.....

Correct Answer: Correct answer is: (C) Host address.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: IP addresses are divided into two parts: the network address and the host address.

Common Mistakes: Students may confuse the host address with the local address or internet address.

Explanations: An IP address is structured to identify both the network and the specific device (host) within that network. The network address identifies the network, while the host address identifies the specific device within that network. This division allows for efficient routing and addressing in network communications.

Option Analysis:

Option A: Internet address is not a standard term used to describe the division of IP addresses.
Option B: Local address is not a standard term used to describe the division of IP addresses.
Option C: Host address is the correct term used to describe the part of the IP address that identifies the specific device within a network.
Option D: None of the above is incorrect because the host address is a valid and standard term.

Mnemonic: N-H: Network-Host

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Computer networking MCQ - Set 62

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