Wireless Network MCQs Quiz

Interoperable is the term used to describe the ability for networking devices from different manufacturers to communicate effectively. This means that these devices can work together and exchange information seamlessly, regardless of their brand or origin. Interoperability is crucial in networking as it allows for the integration and compatibility of various devices, enabling a more efficient and flexible network infrastructure.

An access point is the central device in an infrastructure WLAN. It acts as a communication hub, allowing wireless devices to connect to the network and access resources. It is responsible for transmitting and receiving wireless signals, and it provides a connection between the wireless devices and the wired network infrastructure. The access point typically connects to a router or a switch to enable communication with other networks or the internet.

FHSS stands for Frequency-Hopping Spread Spectrum, which is one of the two general types of spread-spectrum modulation. In FHSS, the carrier frequency is rapidly changed or hopped over a wide range of frequencies. This technique helps in reducing interference and improving the overall reliability and security of wireless communication systems. By hopping between different frequencies, FHSS makes it difficult for unauthorized users to intercept or jam the signal. Therefore, FHSS is a widely used modulation technique in various applications such as wireless LANs, Bluetooth, and military communication systems.

A PAN (Personal Area Network) is a communications network that connects computing and other devices in the immediate vicinity of an individual to support their activities. This type of network is typically used for personal use and connects devices such as smartphones, tablets, laptops, and wearable devices. It allows for the transfer of data and enables devices to communicate with each other, making it convenient for individuals to access and share information within their immediate surroundings.

Coverage is the characteristic that addresses the range and signal strength of the transmitted signal of a WLAN. It refers to the area or space within which the wireless network can reach and provide a strong and reliable signal. The coverage of a WLAN determines how far the signal can reach and how well it can penetrate obstacles such as walls or other physical barriers. It is an important consideration when planning a WLAN to ensure that the desired area is adequately covered by the network signal.

When an electromagnetic wave travels through a medium like air, its speed is constant and is equal to the speed of light. The frequency of the wave represents the number of complete oscillations it makes in a given time, while the wavelength represents the distance between two consecutive points of the wave. Multiplying the frequency by the wavelength gives the wave's speed, which is always equal to the speed of light in this case. Therefore, the correct answer is "the speed of light."

IEEE 802.11i is a standard that defines security enhancements for wireless networks, specifically the implementation of the Advanced Encryption Standard (AES) for data encryption. It does not define a physical layer (PHY) for wireless communication. On the other hand, 802.11a, 802.11b, and 802.11g are all standards that define different PHY layers for wireless communication.

The IEEE 802.11n standard supports data rates of up to 100 Mbps. This standard, also known as Wi-Fi 4, introduced multiple-input multiple-output (MIMO) technology, which allows for increased data throughput. It operates in both the 2.4 GHz and 5 GHz frequency bands and uses channel bonding to increase bandwidth. 802.11h is a standard for dynamic frequency selection (DFS) in Europe, 802.11c is not a valid IEEE standard, and 802.11i is a security standard for Wi-Fi networks.

All of the options listed can cause interference in an RF transmission. A metal box can block or reflect the radio waves, causing a decrease in signal strength. Humans can also absorb or reflect RF waves, leading to signal degradation. Walls, floors, and ceilings can attenuate the RF signal as it passes through, resulting in weaker reception. Therefore, all of these factors can contribute to interference in an RF transmission.

A wireless router includes and supports the functions of an access point, a wireless switch, and a router. It acts as a central hub for a wireless network, allowing devices to connect wirelessly and providing internet connectivity. It combines the functionality of a traditional router, which directs network traffic between different devices, with the capabilities of an access point, which enables wireless connections. Additionally, a wireless router can also function as a wireless switch, allowing multiple devices to connect to the network simultaneously.

A WWAN (Wireless Wide Area Network) topology in which a single base station provides wireless communication links to multiple subscriber stations is best defined as point-to-multipoint. In this topology, the base station acts as a central hub, transmitting data to and receiving data from multiple subscriber stations. Each subscriber station can communicate with the base station but not directly with other subscriber stations. This topology is commonly used in cellular networks where a single cell tower provides coverage to multiple mobile devices.

Ad-hoc mode is a type of wireless network that enables devices to communicate directly with each other without the need for a central infrastructure or access point. In this mode, devices can form a temporary network and exchange data directly, without relying on a pre-existing network infrastructure. This allows for quick and flexible communication between devices in situations where a centralized network is not available or practical.

A wireless extension to a wired network can eliminate the need for new cables to be installed because wireless technology allows devices to connect to the network without the use of physical cables. This means that additional devices can be added to the network without the hassle of running new cables, making it a convenient and cost-effective solution. Access points, routers, and bridges are all components that enable wireless connectivity, but cables are not necessary when using wireless technology.

The general rule of propagation is the inverse-square law, which measures an electromagnetic wave's strength relative to the distance over which it is transmitted. This means that as the distance from the source of the wave increases, the intensity of the wave decreases. The propagation of an electromagnetic wave refers to how it travels through a medium or through space. The inverse-square law is a fundamental principle in understanding the behavior of electromagnetic waves and their transmission.

A WWAN (Wireless Wide Area Network) topology in which a single base station provides a wireless communication link to a single subscriber station is best defined as point-to-point. In this topology, the communication is established between two specific points, the base station and the subscriber station, creating a direct link between them. This differs from other topologies like multipoint-to-point or point-to-multipoint, where multiple stations are involved in the communication. The point-to-point topology is commonly used in scenarios where a dedicated and secure connection is required between two specific locations.

When an office worker connects to a WLAN BSS (Wireless Local Area Network Basic Service Set) from his desktop, the wireless network mode being used is infrastructure. In infrastructure mode, the wireless network is set up with one or more access points that act as a central hub for all the connected devices. This allows the office worker to connect to the WLAN BSS through the access point, providing a more stable and reliable connection compared to ad-hoc mode.

SOHO stands for Small Office/Home Office. It is an acronym used to identify a single remote network that typically connects to another network to conduct its work. This term is commonly used to refer to small businesses or individuals who work from home and require a network connection to conduct their business activities.

L2CAP stands for Logical Link Control and Adaptation Protocol. It is a Layer 2 Bluetooth protocol that provides both connection-oriented and connectionless data services. L2CAP handles the segmentation and reassembly of data packets, as well as the multiplexing and demultiplexing of multiple higher-layer protocols over a single Bluetooth connection. It allows for reliable and efficient transmission of data between Bluetooth devices, making it an essential component of the Bluetooth protocol stack.

A router is a networking device used to forward packets on a packet-switching network. It operates at the network layer of the OSI model and makes decisions on how to route data packets to their destination based on the destination IP address. Routers connect multiple networks together and use routing tables to determine the best path for data transmission. Unlike hubs or LAN switches, routers can make intelligent decisions about where to send data packets, allowing for efficient and reliable communication between different networks. NAP (Network Access Point) is a specific type of router used for interconnecting multiple networks.

In four-phase modulation, the available angles are 0, 90, 180, and 270 degrees. These angles represent the different phases of the signal. However, 135 degrees is not an available angle for four-phase modulation.

Microwaves use line-of-sight propagation, which means that they travel in a straight line from the transmitter to the receiver without any obstacles in between. This type of propagation is commonly used in microwave communication systems because it allows for high data transmission rates and low signal loss. The line-of-sight propagation requires a clear path between the transmitter and receiver, so it is commonly used for short-range communication links such as wireless LANs and satellite communication.

Hewlett-Packard was not an original Bluetooth SIG member. The Bluetooth SIG (Special Interest Group) is a consortium of companies that develop and promote Bluetooth technology. The original members of the Bluetooth SIG were Ericsson, Nokia, IBM, and Toshiba. Hewlett-Packard, although a prominent technology company, was not part of the original group that formed the Bluetooth SIG.

OFDM (Orthogonal Frequency Division Multiplexing) is the modulation method used with 802.11a PHY. OFDM is a digital modulation technique that divides the available frequency spectrum into multiple subcarriers, each carrying a different data symbol. These subcarriers are orthogonal to each other, meaning they do not interfere with each other, allowing for efficient use of the frequency spectrum. OFDM is particularly suitable for high-speed wireless communication systems like 802.11a, as it provides good spectral efficiency and robustness against multipath fading.

Standards-based systems ensure that all equipment manufactured to the same standard can work together and communicate effectively. This means that different devices from different manufacturers can seamlessly interact and exchange information, regardless of their specific characteristics or features. Interoperability is crucial in promoting compatibility, efficiency, and collaboration among various technologies, allowing for seamless integration and improved functionality in diverse environments.

IEEE 802.11 WLANs primarily operate on the 2.4 GHz Industrial, Scientific, and Medical (ISM) frequency band. The ISM band is a frequency range that is globally available for unlicensed use, making it suitable for wireless communication technologies like WLANs. The IEEE 802.11 standard specifically defines the protocols and specifications for wireless local area networks, commonly known as Wi-Fi. Therefore, 802.11 is the correct answer as it is the IEEE standard that governs WLANs.

A wireless personal area network (WPAN) is typically associated with the personal operating space. This refers to the immediate physical area around an individual, such as within a few meters, where wireless devices can connect and communicate with each other. It is a small-scale network that allows for wireless connectivity between devices like smartphones, tablets, and wearable technology within a limited range. This personal operating space provides convenience and flexibility for individuals to connect and transfer data wirelessly in their immediate surroundings.

The correct answer is throughput. The bandwidth of a WLAN is shared among all the stations connected to it. When there are more stations attempting to share the bandwidth, it can lead to congestion and decrease the overall throughput or data transfer rate. This means that the performance of the WLAN in terms of transferring data efficiently can be affected by the number of stations using the network simultaneously.

RFI stands for Radio Frequency Interference. It refers to the broadcast or generated electrical signals that can disrupt wireless communications. These signals can come from various sources such as electronic devices, power lines, or other wireless systems. RFI can cause interference and degrade the quality of wireless signals, leading to poor reception or dropped connections. It is important to identify and mitigate RFI to ensure reliable wireless communication.

OFDM (Orthogonal Frequency Division Multiplexing) is the correct answer. OFDM is a modulation technique that divides a wideband channel into multiple narrowband sub-channels. In this case, it divides a 20 MHz RF channel into 48 narrowband sub-channels. It then splits a data signal into 48 separate carriers, one on each subchannel. This allows for efficient and reliable transmission of data over the channel, as each carrier can carry a portion of the data signal.

Audio is not an example of electromagnetic radiation using waveform because audio refers to sound waves, which are mechanical waves that require a medium to propagate, such as air or water. Electromagnetic radiation, on the other hand, does not require a medium and can travel through a vacuum. Radio waves, gamma rays, and ultraviolet light are all examples of electromagnetic radiation.

not-available-via-ai

Stationary objects can cause a phenomenon known as attenuation in the RF signal. Attenuation refers to the reduction in the strength or intensity of the signal as it passes through or interacts with objects. Different stationary objects can create varying levels of attenuation, meaning that the signal may be weakened to different extents depending on the object. This can result in a decrease in the signal's amplitude or power, leading to a decrease in the overall strength of the RF signal.

Cordless phones typically use the 900 MHz frequency band. This frequency band is commonly used for wireless communication devices due to its ability to provide good range and penetration through walls and obstacles. The 900 MHz frequency band offers a balance between range and interference, making it suitable for cordless phones to ensure clear and reliable communication within a household or office setting.

The working space surrounding a wireless user, which is defined by the wireless technology in use, is called the Personal Operating Space (POS). This space is determined by the range and capabilities of the wireless technology being utilized, such as Bluetooth or Wi-Fi. It refers to the area within which the user can effectively connect and interact with wireless devices or networks.

When an access point is used to link a wireless network to a wired Ethernet network, the access is considered to be a BSS (Basic Service Set). A BSS is a basic building block of a wireless network and consists of a single access point and one or more wireless devices connected to it. In this scenario, the access point acts as a central hub, connecting the wireless devices to the wired Ethernet network, allowing them to access resources and communicate with devices on the network.

The correct answer is "Star". In an infrastructure WLAN, all devices are connected to a central device called an access point. This access point acts as a hub and coordinates the communication between the devices. The devices communicate with each other through the access point, forming a star-like network topology. This topology allows for efficient communication and easy management of the network.

The correct answer is UNII. UNII stands for Unlicensed National Information Infrastructure and it operates in the frequency range of 4.9 GHz to 5.825 GHz. UNII bands are used for various wireless communication applications such as Wi-Fi, Bluetooth, and other wireless devices.

A PAN, or Personal Area Network, has the advantage of being able to automatically detect and link to any device that falls within its range. This means that devices such as smartphones, tablets, laptops, and other wearable devices can seamlessly and transparently connect to each other without the need for manual configuration. This makes it convenient for users to transfer data, share resources, and communicate between devices within a close proximity.

CDMA (Code Division Multiple Access) is a digital cellular technology that allows multiple users to share the same frequency band simultaneously. It has a higher capacity than GSM (Global System for Mobile Communications), which is a time division multiple access (TDMA) technology. CDMA achieves higher capacity by using a spread spectrum technique that allows multiple users to transmit and receive data simultaneously. Therefore, the statement "The coverage and capacity of CDMA is more than that of GSM" is true. CDMA can support more users and provide better coverage compared to GSM.

SNR stands for Signal-to-Noise Ratio, which is a measurement used to indicate the amount of interference to a particular location. It compares the strength of the desired signal to the level of background noise or interference present. A higher SNR indicates a stronger signal and less interference, while a lower SNR suggests a weaker signal and more interference. Therefore, SNR is the correct answer to the question.

An RF spectrum analyzer is a specially designed RF receiver that is able to receive a wide range of signals, but usually within a user-defined range. It is used to analyze and measure the frequency spectrum of RF signals, allowing for the identification and characterization of different signals present in the frequency range being analyzed. This tool is commonly used in various fields such as telecommunications, radio broadcasting, and wireless networking to monitor and troubleshoot RF signal issues.

Ad-hoc mode of a wireless network refers to a temporary network formed between devices without the need for a centralized infrastructure. In this mode, devices can directly communicate with each other without the use of a router or any other network infrastructure. The term "roaming" is used to describe this mode because devices can freely move and connect to each other as they roam within the network range.

In a wireless ad-hoc network, there is no central authority to control the network and the network topology can change frequently. Therefore, each wireless node in the network needs to independently handle the task of forwarding messages. This means that when a node receives a message, it must determine the best route to forward the message to its intended destination. By doing so, the network can efficiently transmit data from one node to another, ensuring effective communication within the network.

Each of the wireless nodes in an ad-hoc WLAN is a IBSS. IBSS stands for Independent Basic Service Set, which refers to a network where each device communicates directly with other devices without the need for a central access point. In an ad-hoc WLAN, each device functions as both a client and an access point, allowing for peer-to-peer communication. Therefore, IBSS is the correct answer as it accurately describes the nature of the wireless nodes in this type of network.

The correct answer is ISM. ISM stands for Industrial, Scientific, and Medical. It is an FCC RF band that operates in the frequency range of 2.4 GHz to 2.4835 GHz. This band is commonly used for various applications such as Wi-Fi, Bluetooth, and microwave ovens.

The term used to designate the nodes in an ad-hoc network is an Independent basic service set. An independent basic service set refers to a group of wireless devices that communicate directly with each other without the need for a central access point. This type of network allows devices to connect and communicate with each other on a peer-to-peer basis, forming a temporary network without relying on any infrastructure.

Time-Division Duplex (TDD) is a technology that allows for bi-directional communication over a single frequency by using different time slots for transmission and reception. It does not increase the battery life of mobile phones. The other options mentioned, such as the use of different time slots and a single radio frequency, are true for TDD. Additionally, a duplexer is required in TDD to separate the transmission and reception paths.

Portability in the software world refers to the ability of a software program to run on different operating systems or hardware models. This means that the program can be easily transferred or moved from one system to another without requiring significant modifications or adaptations. Portability is important as it allows software developers to create programs that can be used by a wider range of users, regardless of the specific operating system or hardware they are using. It also allows for easier maintenance and updates, as the program can be easily deployed on different platforms.

A MANET (Mobile Ad-Hoc Network) is a type of network that dynamically interconnects mobile wireless devices and must include routing capabilities. In a MANET, devices can communicate with each other directly without the need for a centralized infrastructure, making it suitable for scenarios where a fixed network infrastructure is not available or practical. The devices in a MANET act as both hosts and routers, allowing for the establishment of temporary and dynamic network connections. Therefore, MANET is the correct answer to the question.

Violettooth is not an example of a wireless PAN's cable replacement technology. This is because "Violettooth" is not a recognized or commonly used technology in the field of wireless communication. It is likely a made-up or incorrect term, as the other options (IrDA standard, ZigBee, and Bluetooth) are well-known and established technologies used for wireless PAN's cable replacement.

When deciding between a WLAN and a wired LAN, considerations such as flexibility, ease of installation, and scalability are important factors to take into account. However, RF interferences are not a consideration in this decision. RF interferences refer to the disruptions caused by other wireless devices or signals in the environment, which can affect the performance of a WLAN. While it is important to address and mitigate RF interferences in a WLAN, it is not a consideration when deciding between a WLAN and a wired LAN, as wired LANs are not affected by RF interferences in the same way.

Phase measures the relative position of a wave compared to a reference frequency of the same wavelength. It indicates how much ahead or behind the wave is in its cycle.

Once the wireless device is associated with an access point and communicating, the device is no longer roaming. Roaming refers to the ability of a device to connect to different access points as it moves between different areas. Once the device is associated with an access point, it has established a stable connection and is no longer in the process of roaming.

The correct answer is 802.11i. The 802.11i task group is responsible for defining security improvements for the 802.11x wireless standards. This group focuses on enhancing the security protocols and encryption methods used in wireless networks to protect against unauthorized access and data breaches. By developing and implementing these security measures, the 802.11i task group aims to ensure the confidentiality, integrity, and availability of wireless communications.

A directed infrared transmission requires a clear, unobstructed transmission path between the transmitter and receiver. This means that the infrared signals are focused and directed in a specific direction, allowing for a more efficient and reliable transmission. In contrast, diffused infrared transmission scatters the signals in multiple directions, frequency-hopping constantly changes the frequency of the signals, and direct-sequence infrared transmission uses a spread spectrum technique. Therefore, only directed infrared transmission requires a clear, unobstructed transmission path.

The current designation for the original IEEE 802.11 standard is 802.11 Legacy.

not-available-via-ai

The correct answer is THz (Terahertz). Terahertz frequencies of IR transmissions are not susceptible to RF interference because they operate at a much higher frequency range compared to RF (Radio Frequency) signals. RF interference typically occurs at lower frequency ranges such as MHz (Megahertz) and KHz (Kilohertz). The higher frequency of Terahertz allows for a more reliable and interference-free transmission of IR signals.

IBSS stands for Independent Basic Service Set, which is a type of base station associated with ad-hoc and peer-to-peer wireless networking. In an IBSS, devices can directly communicate with each other without the need for a central access point. This allows for a decentralized network where devices can connect and communicate with each other on an ad-hoc basis, without relying on a traditional infrastructure.

The correct answer is Portability. An infrastructure WLAN provides the advantage of centralized management, allowing for easier network administration and control. It also offers scalability, meaning that it can be expanded and adapted to accommodate a larger number of devices. Additionally, an infrastructure WLAN typically offers better security measures compared to an ad-hoc wireless network. However, portability is not specifically an advantage of an infrastructure WLAN, as both infrastructure and ad-hoc networks can be portable depending on the setup and configuration.

A site survey is conducted to ensure that a WLAN design provides sufficient signal strength and bandwidth to planned stationary or mobile nodes. This involves assessing the physical environment, identifying potential sources of interference, and determining the optimal placement of access points to achieve the desired coverage and performance. By conducting a site survey, network administrators can identify any potential issues and make adjustments to the WLAN design to ensure that it meets the requirements of the intended users.

When more than 8 Bluetooth devices are present within the range of a master device, Bluetooth forms a logical structure called a scatternet. Within this scatternet, multiple piconets are organized. A piconet is a network that consists of one master device and up to 7 active slave devices. Therefore, when there are more than 8 devices, multiple piconets are formed and organized into a scatternet.

In RF terminology, a metal box is any metallic or magnetic object that blocks or absorbs a transmitted RF signal. This means that if a metal box is present, it will prevent the RF signal from passing through or being transmitted effectively. The term "magnetic" refers to the property of the object that allows it to block or absorb the RF signal. Therefore, the correct answer is magnetic.

Cable TV using co-axial cable is a common application of frequency-division multiplexing transmissions. This means that different channels are allocated different frequency ranges within the co-axial cable, allowing multiple signals to be transmitted simultaneously without interfering with each other. Each channel is assigned a specific frequency band, and the signals are combined at the source and separated at the destination using filters. This allows for efficient transmission of multiple channels over a single cable.

A Bluetooth device cannot act as a master for two piconets because the master is responsible for establishing and maintaining the connection in a piconet. Each piconet can have only one master, which controls the frequency-hopping sequence and coordinates communication with the slave devices. Therefore, a Bluetooth device cannot take on the role of a master for multiple piconets simultaneously.

IBSS stands for Independent Basic Service Set, which is a mode in wireless networking. In IBSS mode, devices can connect to each other directly without the need for a central access point. They can establish a network whenever they are within each other's range, as long as they agree on certain link parameters. This mode is commonly used in ad-hoc networks, where devices need to communicate with each other without relying on a centralized infrastructure.

WWAN stands for Wireless Wide Area Network. It is the correct acronym for the type of network that uses wireless communications technologies to interconnect geographically separated local area networks for the purpose of exchanging transmitted data.

In infrastructure mode, all the wireless stations on the WLAN communicate directly and only with an access point to create a Basic Service Set. This means that the access point acts as a central hub for all the wireless devices to connect to and communicate with each other. The Basic Service Set is the most common and widely used mode of operation in wireless networks, where the access point controls the communication between the devices and provides network connectivity.

The connectivity from the exchange to customer premises is referred to as the access network or local loop. This term is used to describe the physical infrastructure that connects individual customers to the central exchange or service provider. It includes the cables, wires, and other equipment necessary to transmit data and provide communication services to the end-users. The access network is an essential component of telecommunications systems, enabling the delivery of services such as telephone, internet, and television to customers.

A pilot network refers to a small subset of an entire planned network. It is commonly used to test or evaluate the feasibility and functionality of the network before its full implementation. By deploying a pilot network, organizations can identify and address any potential issues or challenges that may arise, allowing them to make necessary adjustments and improvements before rolling out the complete network infrastructure.

Active scanning allows a wireless NIC to connect to an access point without needing to wait for a beacon from the access points within its range. This means that the wireless NIC actively searches for available access points by sending out probe requests, allowing for a faster and more efficient connection process.

A site survey is performed to fully understand how radio waves will behave in a certain area before the actual installation of a WLAN proceeds. This involves conducting a thorough analysis of the physical environment, including factors such as building layout, obstacles, and interference sources. By conducting a site survey, network administrators can identify potential issues that may affect the performance of the WLAN, such as dead zones or areas with high levels of interference. This information allows them to make informed decisions regarding the placement of access points and other network equipment to ensure optimal coverage and performance.

High-frequency radio waves use sky propagation. This means that these waves are able to travel through the Earth's atmosphere and bounce off the ionosphere, allowing them to propagate over long distances. This type of propagation is commonly used for long-distance communication, such as in satellite communication or shortwave radio broadcasting.

A peer-to-peer connection refers to a direct connection between two devices without the need for a central server. However, in the context of a WLAN (Wireless Local Area Network), peer-to-peer connections are not a primary factor in determining how well a moving connection can remain linked. Factors such as 802.11 roaming (the ability of a device to switch between different access points), roaming configuration (settings that determine how devices handle roaming), and the duration of the movement are more relevant in maintaining a stable connection while moving within a WLAN.

Scalability refers to the ability of a network to adapt and expand according to the growing requirements of an organization or home. It allows the network to handle increased traffic, data, and users without compromising performance or efficiency. Scalability ensures that the network can easily accommodate additional devices, users, or resources as needed, making it a crucial aspect for organizations or homes that anticipate growth or changes in their network infrastructure.

EMI stands for Electromagnetic Interference, which is the type of interference emitted by nearby electrical motors, appliances, or faulty connections. This interference can disrupt the proper functioning of electronic devices and communication systems by causing electromagnetic disturbances in their vicinity. EMI can be caused by various sources, including power lines, radio waves, and electrical equipment. It is important to minimize EMI to ensure the reliable operation of electronic devices.

The receive signal strength indicator (RSSI) is used to measure the strongest signal on a particular channel at a specific location. This indicator helps determine the strength of the signal being received by a device, allowing for the assessment of signal quality and potential performance issues. By measuring the strongest signal on a specific channel, users can optimize their network setup and improve connectivity.

The read/write unit of an RFID system constantly scans on its 13.56 MHz frequency for any transponders within its range. This frequency is used to send out a signal that causes the transponder to respond with its encoded information.

Wave-division multiplexing is the correct answer because it is a technique used to combine multiple signals onto a single fiber-optic cable by assigning each signal a different wavelength. This allows for multiple signals to be transmitted simultaneously without interference, maximizing the capacity of the cable. Code-division multiplexing uses different codes to separate signals, time-division multiplexing divides the transmission into time slots, and frequency-division multiplexing separates signals based on different frequency ranges. However, in this case, the question specifically mentions combining transmitted data from different sources onto a fiber-optic cable link, which aligns with the concept of wave-division multiplexing.

Direct-sequence spread spectrum is a signal structuring technique that combines the waveforms of the data and carrier signals using amplitude modulation. In this technique, the data signal is multiplied by a higher rate spreading code, which spreads the signal across a wider bandwidth. This spreading helps in improving the signal's resistance to interference and makes it more secure. The combined waveform is then transmitted over the channel. Therefore, the given explanation aligns with the concept of direct-sequence spread spectrum.

Class 2 transmitters are generally accepted as the default transmitter standard for most Bluetooth products because they have a range of up to 10 meters (33 feet) and are suitable for most consumer electronic devices. They provide a good balance between power consumption and range, making them ideal for devices such as smartphones, tablets, and laptops. Class 3 transmitters have a shorter range, Class 4 transmitters have an even shorter range, and Class 1 transmitters have a much longer range, but they also consume more power. Therefore, Class 2 transmitters are the most commonly used standard for Bluetooth products.

IEEE 802.11b ad-hoc networks are formed on an Independent Basic Service Set or the equivalent of a peer-to-peer wireless network. This means that the network operates without the need for a central access point or infrastructure. Each device in the network can communicate directly with other devices, creating a decentralized network where all devices have equal status and can act as both clients and access points.

DSDV (Destination-Sequenced Distance Vector) is a routing protocol that maintains the ad-hoc network topology by periodically broadcasting routing updates. It uses a sequence number to identify the freshness of routes, ensuring that the most recent routing information is used. This protocol is proactive, meaning it continuously updates and maintains routing tables even when there are no changes in the network. DSDV is suitable for small networks with low mobility, as it requires a considerable amount of overhead due to frequent updates.

The correct answer is WPAN. IEEE's 802.15 body establishes standards for WPAN, which stands for Wireless Personal Area Network. WPAN is a wireless communication network that covers a small area, typically within a person's personal space or immediate surroundings. It is used for connecting devices such as smartphones, tablets, and wearable devices to each other or to the internet. The standards set by IEEE's 802.15 body ensure interoperability and compatibility between different WPAN devices and networks.

RFI stands for Radio Frequency Interference, which is a type of wireless network interference that can originate from a nearby radio wave transmitter. RFI occurs when unwanted radio signals interfere with the normal operation of wireless devices, causing disruption or degradation of the wireless network signal. This interference can be caused by various sources such as radio transmitters, electrical equipment, or other wireless devices operating on the same frequency. It can result in reduced signal strength, slower data transfer rates, and increased errors in wireless communication.

Optical diffusion is a transmission method that bounces IR light beams off of ceilings and walls to support connectivity within a single room or small office. This method utilizes the properties of light to create a network connection without the need for physical cables or wires. By bouncing the light off of surfaces, it can reach different areas of the room, ensuring a strong and reliable connection within the given space.

CDMA (Code Division Multiple Access) is a cellular technology that was first introduced in the second generation of mobile communication systems. It allows multiple users to share the same frequency band simultaneously by assigning unique codes to each user. CDMA was a significant improvement over the first generation analog systems as it provided better call quality, increased capacity, and improved security. Therefore, CDMA belongs to the second generation of mobile communication systems.

Bluetooth is implemented in a device as an integrated microprocessor module, referred to as an application module. This module is responsible for handling the Bluetooth functionality and communication protocols. It allows the device to connect and interact with other Bluetooth-enabled devices, such as smartphones, tablets, and computers. The application module facilitates the transfer of data and enables various Bluetooth features, such as wireless audio streaming, file sharing, and device pairing.

A Bluetooth scatternet is formed when two or up to 10 piconets are connected through one or more common devices. This means that multiple piconets can be interconnected to form a larger network. The common devices act as bridges or hubs, allowing communication between the different piconets. This enables devices within the scatternet to communicate with each other, expanding the range and capabilities of the Bluetooth network.

Bluejacking involves sending messages from a Bluetooth device to any other nearby Bluetooth devices, surprising the recipient. This is a practice where the sender sends unsolicited messages or business cards to Bluetooth-enabled devices within range. The intention is not malicious, but rather to surprise or startle the recipient. It is a harmless form of communication and does not involve any pairing or instant messaging. Toothing refers to a similar practice but specifically involves sending messages of a sexual nature.

A WPAN (Wireless Personal Area Network) involves several computing and peripheral devices that are able to communicate to form a single ad hoc system. WPANs are designed for short-range wireless communication and are typically used for connecting devices such as smartphones, tablets, and wearable devices. Unlike WLANs (Wireless Local Area Networks) and WMANs (Wireless Metropolitan Area Networks), which cover larger areas, WPANs are focused on connecting devices within a small personal area. Wi-Fi, on the other hand, is a technology that allows devices to connect to the internet wirelessly, but it does not necessarily involve multiple devices forming a single ad hoc system.

When the Point of Sale (POS) of two or more individuals overlap, an opportunity occurs for their personal wireless devices to exchange information. This can happen, for example, when two people are in close proximity at a store checkout counter or a payment terminal. In such situations, their devices can establish a connection and exchange data, such as payment information or loyalty program details.

Capacity is the correct answer because it refers to the ability of a WLAN to support a certain number of nodes and provide sufficient bandwidth. It determines how many devices can connect to an access point and how much data can be transmitted simultaneously. Capacity planning is crucial to ensure that the WLAN can handle the expected number of users and their data demands without experiencing performance issues or network congestion.

Frequency is the correct answer because it is a measure of how many wave peaks pass a given point in space in one second. It is commonly measured in hertz (Hz) and determines the pitch of a sound wave or the color of a light wave. A higher frequency means more wave peaks passing in a given time, while a lower frequency means fewer wave peaks passing.

Frequency reuse is the core concept used in cellular technology. This concept involves dividing the available frequency spectrum into smaller cells and reusing the same frequencies in different cells that are sufficiently far apart. By doing so, the limited frequency spectrum can be efficiently utilized, allowing for more users to be accommodated within the system. This approach helps to mitigate interference and improve overall network capacity and quality of service. TDM (Time Division Multiplexing) and Code reuse are not the core concepts used in cellular technology.