Computer networking MCQ – Change your future

801. Frame Relay networks offer an option called

Correct Answer: Correct answer is: (D) Voice Over Frame Relay.

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Easy

Concept notes: Voice Over Frame Relay (VoFR) is a technology that allows voice traffic to be transmitted over Frame Relay networks.

Common Mistakes: Students may confuse Voice Over Frame Relay with other voice-over technologies, such as Voice Over IP (VoIP), which is used over IP networks.

Explanations: Frame Relay networks offer an option called Voice Over Frame Relay (VoFR). This technology enables voice traffic to be transmitted over Frame Relay networks, making it possible to integrate voice communications into existing Frame Relay infrastructure.

Option Analysis:

Option A: Voice Over For Relay is not a recognized term in networking.
Option B: Voice Over Fine Relay is not a recognized term in networking.
Option C: Voice On Frame Relay is not the correct term; the correct term is Voice Over Frame Relay.
Option D: Voice Over Frame Relay is the correct term for transmitting voice traffic over Frame Relay networks.

802. Which of the following is not a transceiver function?

Correct Answer: Correct answer is: (C) Addition and subtraction of headers.

Exam Relevance: CCNA, Network+, CompTIA Network+

Difficulty: Moderate

Concept notes: Transceivers are devices that handle the transmission and receipt of data over a network. They do not typically handle the addition or subtraction of headers, which is more related to the data link layer functions.

Common Mistakes: Students may mistakenly believe that transceivers handle all aspects of data transmission, including header management, due to the broad functionality of network devices.

Explanations: Transceivers are responsible for the physical transmission and receipt of data over a network. They do not manage the addition or subtraction of headers, which is a function typically performed by higher-level protocols in the OSI model, such as the data link layer. Therefore, the function of adding and subtracting headers is not a transceiver function.

Option Analysis:

Option A: Transmission and receipt of data is a core function of transceivers.
Option B: Checking of line voltages is a diagnostic function that transceivers can perform to ensure proper operation.
Option C: Addition and subtraction of headers is not a function of transceivers but rather of higher-level protocols.
Option D: Collision detection is a function performed by transceivers in certain network environments, such as Ethernet.

803. What is the frequency range of the IEEE 802.11a standard?

Correct Answer: Correct answer is: (D) 5GHz.

Exam Relevance: Computer Networks, Wireless Communications, IEEE Standards

Difficulty: Easy

Concept notes: IEEE 802.11a is a wireless networking standard that operates in the 5GHz frequency band.

Common Mistakes: Students may confuse the frequency band of IEEE 802.11a with the 2.4GHz band used by IEEE 802.11b/g/n standards.

Explanations: IEEE 802.11a operates in the 5GHz frequency band, which is distinct from the 2.4GHz band used by other standards like 802.11b and 802.11g. This higher frequency band allows for higher data rates but has a shorter range and is more susceptible to interference from physical obstacles.

Option Analysis:

Option A: 2.4Gbps is a data rate, not a frequency range.
Option B: 5Gbps is a data rate, not a frequency range.
Option C: 2.4GHz is the frequency range for IEEE 802.11b/g/n, not 802.11a.
Option D: 5GHz is the correct frequency range for IEEE 802.11a.

Mnemonic: 5GHz for 802.11a, think "A for Above 2.4GHz".

804. Non-polling system is

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

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

Difficulty: Moderate

Concept notes: TDMA (Time Division Multiple Access) is a non-polling system used in communication networks where each user is assigned a specific time slot to transmit data, eliminating the need for polling.

Common Mistakes: Students may confuse TDMA with polling systems like Stop and Wait or Continuous ARQ, which require explicit requests for data transmission.

Explanations: TDMA is a non-polling system because it allocates time slots to users in a predefined manner, allowing each user to transmit data during their assigned time without the need for polling. In contrast, polling systems like Stop and Wait and Continuous ARQ require a central controller to request data from each user, making them polling systems.

Option Analysis:

Option A: TDMA is a non-polling system as it allocates time slots to users without the need for polling.
Option B: Stop and Wait is a polling system where the sender waits for an acknowledgment before sending the next packet.
Option C: Continuous ARQ is a polling system where the sender sends multiple packets and waits for an acknowledgment for a range of packets.
Option D: This option is incorrect as TDMA is indeed a non-polling system.

805. Global Service for Mobile (GSM) uses two bands for duplex

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

Exam Relevance: GATE, GRE, CCNA

Difficulty: Easy

Concept notes: GSM uses two frequency bands for duplex communication to separate the uplink and downlink signals.

Common Mistakes: Students may confuse the term "bands" with data or signals rather than understanding it in the context of communication.

Explanations: GSM employs two distinct frequency bands to ensure that the uplink (mobile to base station) and downlink (base station to mobile) communications do not interfere with each other. This is essential for duplex communication, where both transmission and reception occur simultaneously.

Option Analysis:

Option A: Data is not the correct term for the frequency bands used in GSM.
Option B: Communications is the correct term as GSM uses two bands for duplex communication.
Option C: Signals are transmitted over the bands but do not define the bands themselves.
Option D: Stations refer to the endpoints of communication but not the bands used.

806. ..... network consists of a series of interlinked nodes

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Moderate

Concept notes: A switched network consists of a series of interlinked nodes that use switches to manage and direct data traffic between devices.

Common Mistakes: Students may confuse switched networks with other network topologies like bus, point-to-point, or star networks, which do not involve the use of switches to manage data traffic.

Explanations: In a switched network, switches are used to connect multiple devices and manage data traffic. Each switch can connect to multiple devices and can direct data to the appropriate destination, reducing network congestion and improving efficiency. This is different from other network topologies like bus, point-to-point, or star, which do not use switches to manage data traffic.

Option Analysis:

Option A: A bus network uses a single shared communication line for all devices, not interlinked nodes with switches.
Option B: A point-to-point network connects devices directly to each other without the use of switches.
Option C: A star network connects all devices to a central hub, but does not necessarily use switches to manage data traffic.
Option D: A switched network uses switches to manage and direct data traffic between interlinked nodes, making it the correct answer.

Mnemonic: Switched = Switches Direct Data

807. WPA2 uses what, instead of RC4, used by WEP and WPA?

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

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Moderate

Concept notes: WPA2 uses AES (Advanced Encryption Standard) for encryption, which is more secure than the RC4 algorithm used in WEP and WPA.

Common Mistakes: Students may confuse the encryption standards used in different Wi-Fi security protocols, thinking RC4 is still used in WPA2.

Explanations: WPA2 employs AES for its encryption needs, providing stronger security compared to the RC4 algorithm used in WEP and WPA. AES is a symmetric encryption algorithm that offers robust protection against various types of attacks, making it a preferred choice for modern wireless security protocols.

Option Analysis:

Option A: Correct. WPA2 uses AES for encryption.
Option B: Incorrect. RC4 is used in WEP and WPA, not WPA2.
Option C: Incorrect. RC3 is not a standard encryption algorithm used in Wi-Fi security protocols.
Option D: Incorrect. 3DES is not used in WPA2; AES is the standard.

Mnemonic: AES for WPA2, RC4 for WEP and WPA.

808. A well-defined groups that are numerically large in size but small compared to the network as a whole are used in.....

Correct Answer: Correct answer is: (B) Multicast routing.

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Moderate

Concept notes: Multicast routing is used to efficiently send data to a well-defined group of recipients, which are numerically large in size but small compared to the entire network.

Common Mistakes: Students may confuse multicast routing with unicast routing, which sends data to a single recipient, or broadcast routing, which sends data to all recipients in the network.

Explanations: Multicast routing is designed to handle communication to a specific group of recipients, making it ideal for scenarios where a large but limited number of recipients need to receive the same data. This is in contrast to unicast routing, which is for one-to-one communication, and broadcast routing, which is for one-to-all communication.

Option Analysis:

Option A: Unicast routing is used for one-to-one communication, not for groups.
Option B: Multicast routing is used for one-to-many communication, specifically targeting well-defined groups.
Option C: Broadcast routing sends data to all recipients in the network, not just a specific group.
Option D: Telecast routing is not a standard term in networking.

809. The constellation diagram of BASK has..... dots.

Correct Answer: Correct answer is: (A) 2.

Exam Relevance: GATE, ECE exams, IEEE exams

Difficulty: Easy

Concept notes: BASK (Binary Amplitude Shift Keying) uses two different amplitude levels to represent binary data. The constellation diagram for BASK will have two distinct points, one for each amplitude level.

Common Mistakes: Students may confuse BASK with other modulation schemes like ASK (Amplitude Shift Keying) which can have more than two levels, leading to incorrect assumptions about the number of dots in the constellation diagram.

Explanations: BASK is a binary modulation scheme, meaning it uses two distinct amplitude levels to represent binary data. In the constellation diagram, each amplitude level corresponds to a distinct point. Therefore, the constellation diagram of BASK has two dots, one for each amplitude level.

Option Analysis:

Option A: Correct. BASK has two distinct amplitude levels, resulting in two dots in the constellation diagram.
Option B: Incorrect. One dot would imply a single amplitude level, which is not the case for BASK.
Option C: Incorrect. Zero dots would imply no amplitude levels, which is not possible for any modulation scheme.
Option D: Incorrect. The correct number of dots is specified in the options, so "None of the above" is not applicable.

810. The..... layer is responsible for the movement of a signal across a physical line.

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

Exam Relevance: Telecommunications Engineering, Network Engineering, SDH/SONET Certification

Difficulty: Moderate

Concept notes: The line layer is responsible for the movement of a signal across a physical line in telecommunications networks.

Common Mistakes: Students often confuse the line layer with the section layer, which is responsible for the physical transmission medium.

Explanations: The line layer is part of the Synchronous Digital Hierarchy (SDH) or Synchronous Optical Network (SONET) architecture. It is responsible for the transmission of signals over a physical line, ensuring the signal is properly encoded and decoded for transmission. The line layer handles the framing and multiplexing of signals, ensuring they can be transmitted over the physical medium without loss or corruption.

Option Analysis:

Option A: The section layer is responsible for the physical transmission medium, not the movement of the signal across the line.
Option B: The line layer is responsible for the movement of a signal across a physical line, making it the correct answer.
Option C: The path layer is responsible for the end-to-end transmission of data, not the movement of the signal across the line.
Option D: The photonic layer is not a standard layer in SDH/SONET architecture and is not responsible for signal movement across a physical line.

Mnemonic: Line Layer: "L" for "Line" and "L" for "Link"

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Computer networking MCQ - Set 81

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