Computer networking MCQ - Change your future

901. Which two OSI model layers have the same functionality as two layers of the TCP/IP model? (Choose two.)

Correct Answer: Correct answer is: (D) Only (A) & (B).

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The OSI model and the TCP/IP model both have layers that handle similar functions. The Network layer in the OSI model corresponds to the Internet layer in the TCP/IP model, and the Transport layer in the OSI model corresponds to the Transport layer in the TCP/IP model.

Common Mistakes: Students often confuse the Data Link layer of the OSI model with the Network Access layer of the TCP/IP model, which do not have the same functionality.

Explanations: The Network layer in the OSI model is responsible for routing and addressing, which is similar to the Internet layer in the TCP/IP model. The Transport layer in the OSI model handles end-to-end communication and error correction, which is the same as the Transport layer in the TCP/IP model. The Data Link layer in the OSI model deals with physical addressing and error detection, which does not correspond to any layer in the TCP/IP model.

Option Analysis:

Option A: The Network layer in the OSI model corresponds to the Internet layer in the TCP/IP model.
Option B: The Transport layer in the OSI model corresponds to the Transport layer in the TCP/IP model.
Option C: The Data Link layer in the OSI model does not have a corresponding layer in the TCP/IP model with the same functionality.
Option D: This option correctly identifies that only the Network and Transport layers have corresponding layers in the TCP/IP model with the same functionality.

Mnemonic: NAT: Network and Transport layers match.

902. WiMAX provides you?

Correct Answer: Correct answer is: (A) Full duplex communication.

Exam Relevance: GATE, GRE, CCNA

Difficulty: Easy

Concept notes: WiMAX (Worldwide Interoperability for Microwave Access) is a telecommunications technology that provides high-speed internet access over long distances. It supports full duplex communication, which means data can be transmitted in both directions simultaneously.

Common Mistakes: Students may confuse WiMAX with other wireless technologies that may not support full duplex communication, leading to incorrect answers.

Explanations: WiMAX supports full duplex communication, allowing simultaneous transmission and reception of data. This is a key feature that distinguishes WiMAX from other wireless technologies that may only support half duplex or simplex communication.

Option Analysis:

Option A: Correct. WiMAX supports full duplex communication.
Option B: Incorrect. Half duplex communication allows transmission in both directions but not simultaneously.
Option C: Incorrect. Simplex communication only allows transmission in one direction.
Option D: Incorrect. Duplex communication is a general term that includes both full and half duplex, but WiMAX specifically supports full duplex.

Mnemonic: WiMAX: Full Duplex, Both Ways Simultaneously

903. A signal with 200 mill watts power passes through 10 devices, each with an average noise of2 microwatts, calculate SNR

Correct Answer: Correct answer is: (B) 10000.

Exam Relevance: ECE, EE, Signal Processing exams

Difficulty: Moderate

Concept notes: The Signal-to-Noise Ratio (SNR) is a measure used to compare the level of the desired signal to the level of background noise. It is calculated as the ratio of signal power to noise power.

Common Mistakes: Students often confuse the total noise power with the noise power per device, leading to incorrect calculations.

Explanations: To calculate the SNR, we need to determine the total noise power and the signal power. The signal power is given as 200 milliwatts (mW). The noise power per device is 2 microwatts (μW). Since there are 10 devices, the total noise power is 10 * 2 μW = 20 μW. Converting 20 μW to milliwatts, we get 20 μW = 0.02 mW. The SNR is then calculated as the signal power divided by the total noise power: SNR = 200 mW / 0.02 mW = 10000.

Option Analysis:

Option A: Incorrect, as the calculation shows the SNR is 10000, not 5000.
Option B: Correct, as the calculation shows the SNR is 10000.
Option C: Incorrect, as the calculation shows the SNR is 10000, not 150.
Option D: Incorrect, as the calculation shows the SNR is 10000, not 200.

904. The protocol for mail transfer is

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

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: SMTP stands for Simple Mail Transfer Protocol, which is used for sending email messages between servers.

Common Mistakes: Students may confuse SMTP with other protocols like HTTPS, which is used for secure web browsing, or DNS, which is used for translating domain names into IP addresses.

Explanations: SMTP is the protocol specifically designed for the transfer of email messages. It operates at the application layer of the OSI model and is responsible for routing and delivering email from the sender's server to the recipient's server. Other protocols like HTTPS, TCP/IP, and DNS serve different purposes and are not used for email transfer.

Option Analysis:

Option A: HTTPS is used for secure web browsing, not for email transfer.
Option B: SMTP is the correct protocol for email transfer.
Option C: TCP/IP is a suite of protocols for network communication, not specifically for email.
Option D: DNS is used for translating domain names into IP addresses, not for email transfer.

905. ..... is not suitable for interactive multimedia traffic because it retransmits packets in case of errors.

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

Exam Relevance: Computer Networks, Data Communications, Network Protocols

Difficulty: Moderate

Concept notes: TCP (Transmission Control Protocol) is connection-oriented and ensures reliable data transmission by retransmitting packets in case of errors. This retransmission mechanism can introduce delays, making TCP unsuitable for real-time or interactive multimedia traffic where low latency is crucial.

Common Mistakes: Students often confuse TCP and UDP, thinking both are suitable for real-time applications without considering the retransmission overhead of TCP.

Explanations: TCP ensures reliable data transmission by retransmitting packets in case of errors. This retransmission mechanism can introduce significant delays, which is undesirable for interactive multimedia traffic that requires low latency. UDP, on the other hand, does not retransmit packets, making it more suitable for real-time applications where timely delivery is more important than reliability.

Option Analysis:

Option A: UDP does not retransmit packets, making it suitable for real-time multimedia traffic.
Option B: TCP retransmits packets in case of errors, which can introduce delays, making it unsuitable for real-time multimedia traffic.
Option C: Both a and b is incorrect because UDP is suitable for real-time traffic.
Option D: None of the above is incorrect because TCP is indeed unsuitable for real-time multimedia traffic.

Mnemonic: TCP Retransmits, Delays Occur

906. IEEE has defined the specifications for a wireless LAN, called....., which covers the physical and data link layers.

Correct Answer: Correct answer is: (C) IEEE 802.11.

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Easy

Concept notes: IEEE 802.11 is the standard for wireless local area networks (WLANs), covering the physical and data link layers.

Common Mistakes: Students may confuse IEEE 802.11 with other IEEE standards like 802.3 (Ethernet) or 802.5 (Token Ring).

Explanations: IEEE 802.11 is the correct standard for wireless LANs, which includes specifications for the physical layer (PHY) and the data link layer (MAC). This standard defines the protocols for wireless communication, ensuring interoperability among different devices and networks.

Option Analysis:

Option A: IEEE 802.3 is the standard for Ethernet, which is used for wired LANs, not wireless LANs.
Option B: IEEE 802.5 is the standard for Token Ring networks, which is a legacy wired LAN technology.
Option C: IEEE 802.11 is the correct standard for wireless LANs, covering the physical and data link layers.
Option D: IEEE 802.2 is the standard for Logical Link Control (LLC), which is a sublayer of the data link layer but not specific to wireless LANs.

907. In Bluetooth, the.....layer is roughly equivalent to the MAC sublayer in LANs.

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

Exam Relevance: Computer Networks, Wireless Communications, Network Protocols

Difficulty: Moderate

Concept notes: In Bluetooth, the Baseband layer is responsible for managing the physical link and medium access control (MAC) functions.

Common Mistakes: Students may confuse the Baseband layer with the Radio layer, which handles the physical transmission and reception of data.

Explanations: The Baseband layer in Bluetooth is responsible for managing the physical link and medium access control (MAC) functions. This is analogous to the MAC sublayer in LANs, which is responsible for managing access to the physical medium and ensuring that data is transmitted without collisions. Therefore, the Baseband layer in Bluetooth is roughly equivalent to the MAC sublayer in LANs.

Option Analysis:

Option A: The Radio layer is responsible for the physical transmission and reception of data, not the MAC functions.
Option B: The Baseband layer manages the physical link and MAC functions, making it equivalent to the MAC sublayer in LANs.
Option C: The L2CAP (Logical Link Control and Adaptation Protocol) layer is responsible for multiplexing higher-layer protocols over the Baseband layer, not the MAC functions.
Option D: This option is incorrect as the Baseband layer is the correct answer.

Mnemonic: Baseband = MAC, Bluetooth = LAN

908. Address is unicast, if least significant bit of first byte is

Correct Answer: Correct answer is: (A) 0.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: In networking, a unicast address is used for one-to-one communication. The least significant bit of the first byte in the address is set to 0 to distinguish it from multicast addresses, where this bit is set to 1.

Common Mistakes: Students often confuse unicast and multicast addresses, mistaking the least significant bit of the first byte to be 1 for unicast addresses.

Explanations: A unicast address is used for one-to-one communication. The least significant bit of the first byte in the address is set to 0 to distinguish it from multicast addresses, where this bit is set to 1. Therefore, the correct answer is 0.

Option Analysis:

Option A: Correct. The least significant bit of the first byte is 0 for unicast addresses.
Option B: Incorrect. The least significant bit of the first byte is 1 for multicast addresses, not unicast.
Option C: Incorrect. -1 is not a valid bit value in binary addressing.
Option D: Incorrect. Infinity is not a valid bit value in binary addressing.

909. What PPP protocol provides dynamic addressing, authentication, and multilink?

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

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Moderate

Concept notes: LCP (Link Control Protocol) is a component of the PPP (Point-to-Point Protocol) suite that provides dynamic addressing, authentication, and multilink capabilities.

Common Mistakes: Students may confuse LCP with NCP (Network Control Protocol), which is responsible for negotiating network layer protocols but does not handle dynamic addressing, authentication, or multilink.

Explanations: LCP is responsible for establishing, configuring, and testing the data-link connection between two PPP peers. It provides dynamic addressing through negotiation of IP addresses, authentication through various methods like PAP and CHAP, and multilink functionality to combine multiple physical links into a single logical link. NCP, on the other hand, is responsible for negotiating the network layer protocols and does not provide these additional features.

Option Analysis:

Option A: NCP is responsible for negotiating network layer protocols, not dynamic addressing, authentication, or multilink.
Option B: HDLC (High-Level Data Link Control) is a data link layer protocol and does not provide dynamic addressing, authentication, or multilink capabilities.
Option C: LCP provides dynamic addressing, authentication, and multilink capabilities as part of the PPP suite.
Option D: X.25 is a packet-switched wide area network protocol and does not provide dynamic addressing, authentication, or multilink capabilities within PPP.

Mnemonic: LCP: Link Control Protocol - "Link Control Provides"

910. Bus Network

Correct Answer: Correct answer is: (C) Connected to each other using a cable.

Exam Relevance: Networking Fundamentals, Computer Science Exams

Difficulty: Easy

Concept notes: In a bus network, all devices are connected to a single communication line or "bus" using a cable.

Common Mistakes: Students may confuse a bus network with a star network, where devices are connected to a central hub.

Explanations: A bus network is characterized by all devices being connected to a single communication line, often referred to as a "bus." This line is typically a cable that allows data to be transmitted to all devices on the network. This configuration is different from a star network, where devices connect to a central hub, or a ring network, where devices are connected in a circular fashion.

Option Analysis:

Option A: This describes a star network, not a bus network.
Option B: This describes a ring network, not a bus network.
Option C: This correctly describes a bus network where devices are connected to a single communication line using a cable.
Option D: This is incorrect as the correct description is provided in Option C.

Mnemonic: Bus = Cable Connects All

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Computer networking MCQ - Set 91

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