Chapter 3 and 4 wireless

B. USB 3.0 USB devices connect to an interface external to the computer, and no disassembly is required. PCI, PCIe, and Mini-PCI adapters all require some type of disassembly of the computer device.

18. Which WLAN adapter can be installed in a computer without the need to disassemble the computer in any way? A. PCI B. USB 3.0 C. PCIe D. Mini-PCI

A. Software to control a wireless NIC Wireless network cards require device drivers in order for the card to work with the computer operating system. The operating system uses the device driver to control the wireless network adapter or other device that is installed.

19. A device driver can be used in wireless networking. Which is an example of a device driver? A. Software to control a wireless NIC B. Software to control the operating system C. Hardware to install a PCI card D. Hardware to install a client bridge

C. dBi The gain of an antenna is measured in dBi. This is a relative measure of power.

19. What is the gain of an antenna measured in? A. dB B. dBc C. dBi D. dBm

C. Autonomous An autonomous access point is an intelligent, self-contained network infrastructure device. Controller-managed access points (also called thin access points) work with a WLAN controller.

2. A self-contained intelligent access point is _______. A. Controller-managed B. Heavyweight C. Autonomous D. Thin

B. 3 There are three nonoverlapping channels in the 2.4 GHz ISM band. Fourteen channels are available in this band. The locale will determine which channels can be used.

2. How many nonoverlapping channels are available in the unlicensed 2.4 GHz ISM band? A. 1 B. 3 C. 6 D. 11

D. Diffraction Diffraction passes or bends around an obstacle. Reflection bounces off a smooth surface, refraction passes through, and scattering bounces off an uneven surface.

20. When RF passes or bends around an obstacle such as a building or column, the behavior is: A. Reflection B. Refraction C. Scattering D. Diffraction

B. Device driver Device drivers are required. A third-party client utility is optional because manufacturers usually include a utility with the device.

20. Which is required in order to successfully install an IEEE 802.11ac WLAN adapter? A. Security profile B. Device driver C. Third-party client utility D. SOHO utility

A. Number of devices D. Software applications The capacity of an access point is dependent upon the number of devices and software applications in use. Too many users or too many bandwidth-intensive applications will affect the performance of an access point.

3. The capacity of an access point is dependent on which factors? (Choose two.) A. Number of devices B. Channel reuse C. Co-location D. Software applications E. Frequency

B. The same SSID C. The same RF channel Bridges must be on the same RF channel and have the same SSID in order to communicate.

3. Wireless bridges must be configured with _______ and _______. (Choose two.) A. A null SSID B. The same SSID C. The same RF channel D. Channel scanning E. Wired Equivalent Privacy

A. Refraction Refraction occurs when a signal changes speed and bends when passing between mediums of different densities. Reflection bounces off a smooth surface, diffraction will pass around, and scattering bounces off an uneven surface.

4. When an RF signal passes between media of different densities and may change speeds and bend, the behavior is known as: A. Refraction B. Reflection C. Scattering D. Diffraction

B. Larger cell size allows more devices to access the medium. E. Extends cell size. Wireless repeaters do extend the cell size and will potentially allow more users to connect. However, using a wireless repeater will decrease throughput.

4. Which of the following are benefits of a wireless repeater? (Choose two.) A. Higher data transfer rate. B. Larger cell size allows more devices to access the medium. C. Smaller cell size allows fewer devices to access the medium. D. Less data throughput. E. Extends cell size.

A. Transmitter E. Receiver RF communications require a transmitter and receiver. A transistor is an electronic component. A reactor does not exist in RF.

5. What two devices use RF to communicate? (Choose two.) A. Transmitter B. Transistor C. Reactor D. Reflector E. Receiver

A. Midspan A midspan device will inject power into an Ethernet cable. Endpoint power is delivered directly from a switch or controller.

5. Which of the following devices is an in-line device that will inject DC voltage into the Ethernet cable? A. Midspan B. Midpoint C. Endspan D. Endpoint

A. Layer 1 B. Layer 2 Depending on the specific function, access points operate at Layers 1 and 2. Repeaters function only at Layer 1.

6. Access points work at which layers of the OSI model? (Choose two.) A. Layer 1 B. Layer 2 C. Layer 3 D. Layer 4 E. Layer 5 F. Layer 6 G. Layer 7

B. dB D. dBi dB and dBi are relative measures of RF power. mW, dBm, and watt are absolute measures of RF power.

6. Which are relative measures of RF power? (Choose two.) A. mW B. dB C. dBm D. dBi E. Watt

A. WPA 2.0 support B. RADIUS server D. Repeater mode Enterprise access points have adjustable output power. Power sourcing equipment is used in PoE to deliver power and data.

7. Enterprise access points may contain which of the following features? (Choose three.) A. WPA 2.0 support B. RADIUS server C. Static output power D. Repeater mode E. Power sourcing equipment

C. 25 MHz 25MHz is required for channels to be considered nonoverlapping. 22MHz is the width of a DSSS channel in the 2.4 GHz band.

7. In the 2.4 GHz range, what distance between the center frequencies (in megahertz) is required for two channels to be considered nonoverlapping for HR/DSSS? A. 5 MHz B. 22 MHz C. 25 MHz D. 30 MHz

A. Direct connectivity A controller-managed access point connected to a port on the switch is considered to have direct connectivity.

8. A controller-managed access point connected to a port on the WLAN controller and not to an intermediate device is considered to have which of the following? A. Direct connectivity B. Distributed connectivity C. Decentralized connectivity D. Centralized connectivity

A. Amplitude C. Phase Amplitude and phase are two characteristics of RF signals. Reflection, refraction, and diffraction are behaviors of RF.

8. Two characteristics of RF signals are A. Amplitude B. Reflection C. Phase D. Refraction E. Diffraction

B. 4 UNII-1 band has four channels available for WLAN use. Eleven channels are available in UNII-2e.

9. How many channels are available for WLANs to use in the unlicensed UNII-1 band? A. 2 B. 4 C. 6 D. 11

C. Root access point mode Root access point is the default mode in most cases. An access point in root access point mode allows users to connect to the network.

9. Which access point mode involves connecting the access point to a distribution system for user access to the LAN? A. Bridge-only mode B. Repeater-only mode C. Root access point mode D. Access mode

D. Two-way communication one way at a time In computer terminology, half-duplex is two-way communication but only one way at a time. Full-duplex is two-way communication in both directions simultaneously.

1. In computer network terminology, the definition of half-duplex is closest to which of the following? A. One-way communication only B. One-way communication one way at a time C. Two-way communication both directions simultaneously D. Two-way communication one way at a time

B. Frequency Frequency is the number of times in one second a signal will oscillate. Phase is a shift, amplitude is height, and wavelength is a distance of one cycle.

1. What is the term defining the number of times a cycle of an RF signal will oscillate in one second? A. Phase B. Frequency C. Amplitude D. Wavelength

A. Centralized administration B. Captive portal D. Built-in RADIUS services WLAN controllers may contain many advanced features, including centralized administration, captive portal, and built-in RADIUS services. Network Address Translation (NAT) and IP routing are common in wireless residential gateway devices.

10. WLAN controllers may contain which of the following features? (Choose three.) A. Centralized administration B. Captive portal C. Network Address Translation (NAT) D. Built-in RADIUS services E. IP routing

A. Watt C. mW Watt and mW are absolute measures of RF power. dB, dBi, and dBd are relative measures.

10. Which are absolute measures of RF power? (Choose two.) A. Watt B. dB C. mW D. dBi E. dBd

A. 1 and 6 Channels 1 and 6 are nonoverlapping. There must be a separation of five channels (with the exception of channel 14) to be considered nonoverlapping in the 2.4 GHz band.

11. Which two channels are considered nonoverlapping in the 2.4 GHz band? A. 1 and 6 B. 2 and 6 C. 6 and 10 D. 11 and 13

D. Wireless USB 2.0 Wireless USB adapters connect through a USB port in the notebook computer. Virtually all notebook computers have USB ports. PCI adapters are for desktop computers and are installed in an available PCI slot on the motherboard. Wireless Full Mini-PCIe is internal to the device and would require an available interface.

11. You have a notebook computer and wish to connect to an IEEE 802.11ac wireless network. The computer does not have a built-in WLAN card or a PC card interface. You do not want any peripherals connected to the notebook that use wires and do not want to disassemble the computer. Which wireless adapter would be the best solution? A. Wireless PCI B. Wireless PCMCIA C. Wireless Full Mini-PCIe D. Wireless USB 2.0

D. 14 There are 14 channels available in the unlicensed 2.4 GHz ISM band. The channels used are determined by the locale.

12. How many channels are available for WLAN use in the unlicensed 2.4 GHz ISM band? A. 8 B. 10 C. 11 D. 14

A. Device driver A device driver is a required component for the USB adapter to function with the operating system. Installation of client utility software may not be required when using a device that has the wireless client software built into the operating system, such as Windows AutoConfig service. Profiles are typically a function of the client utility software.

12. Which component is required for a successful installation and operation of an 802.11ac wireless USB adapter? A. Device driver B. Client utility C. Profile software D. Windows AutoConfig

B. Wavelength The wavelength is the measurement of one complete cycle of an RF signal. The higher the frequency, the shorter the wavelength—therefore, the shorter the range. Frequency is the number of times an RF signal cycles in one second, amplitude is the height from a 2D perspective, and phase is a shift.

13. The range of a 2.4 GHz signal is mostly dependent on which RF characteristic? A. Frequency B. Wavelength C. Amplitude D. Phase

B. USB 3.0 A USB 3.0 adapter can be connected to a port on the outside of the computer. Mini-PCI and Half Mini-PCIe are typically used in notebook computers and other portable devices and require some level of disassembly. PCMCIA cards can be used in desktop computers only if an internal PCI adapter is used, which will require disassembly of the computer case.

13. You want to connect a desktop computer to an IEEE 802.11ac wireless network. Which WLAN adapter would be the best solution if you do not want to disassemble the computer? A. Mini-PCI B. USB 3.0 C. Half Mini-PCIe D. PCMCIA

A. 1 Serial communication transmits one bit at a time. Parallel transmits several bits at a time

14. How many data bits does serial communication transmit at a time? A. 1 B. 3 C. 4 D. 8

B. Obstacles Obstacles affect the RF line of sight. Phase and amplitude are characteristics of radio frequency, and interference affects the throughput.

14. Which item has an effect on RF line of sight? A. Phase B. Obstacles C. Interference D. Amplitude

C. 12 There are now 12 channels available for WLAN use in the unlicensed UNII-2e band as a result of the 802.11ac addition to the standard. Channel 144 is now available for use. Two of the other three 5 GHz bands have only 4 channels each, and depending on where it is used, the UNII-3 band now allows for up to 5 channels with the reclassification of channel 165 to the UNII band.

15. How many channels are available for WLAN use in the unlicensed middle UNII-2e band? A. 4 B. 6 C. 12 D. 14

B. When instructed by the setup utility Most manufacturers recommend installing a wireless USB adapter at a specific point. This is usually after the device driver has been copied to the computer during the setup process. In order for the device drivers to load, the device must be powered on. USB and other adapters are capable of being inserted or removed while a device is powered on. Technical support should be called when the user has exhausted other troubleshooting steps.

15. Most manufacturers recommend installing a wireless IEEE 802.11ac USB adapter at what point? A. When the computer is not powered on B. When instructed by the setup utility C. After calling technical support D. Before starting the setup process

A. Height The amplitude is the height of an RF signal. The length of one cycle is the wavelength, the shift is phase, and width is not a valid factor

16. As seen in a two-dimensional (X/Y) view, the amplitude of an RF signal is: A. Height B. Length C. Shift D. Width

D. Site survey Enterprise client utilities have more advanced features such as a site survey utility. PCI configuration includes physical settings prior to installation. A spectrum analyzer is a separate product used to analyze RF. A setup wizard can be part of a SOHO-grade adapter as well as an enterprise-grade adapter.

16. Enterprise-grade IEEE 802.11n/ac client utilities typically contain which advanced feature? A. PCI configuration B. Spectrum analyzer C. Setup wizard D. Site survey

B. Connect a wired LAN to an access point A wireless workgroup bridge acting as a client device will connect an Ethernet segment to an access point, eliminating the need to install wireless adapters in all of the Ethernet computers. Two wireless NICs connected together are said to be in ad hoc mode. Connecting two client bridges together is not common practice.

17. A wireless workgroup bridge will allow you to do which of the following? A. Connect two WLAN NICs together B. Connect a wired LAN to an access point C. Connect a PCI card to a WLAN D. Connect two client bridges

B. 22 MHz A 2.4 GHz 802.11b signal is 22MHz wide. 25MHz is the distance required to be considered nonoverlapping.

17. An 802.11b channel is how wide in MHz? A. 5 MHz B. 22 MHz C. 25 MHz D. 30 MHz

B. Reflection An RF signal that bounces off a smooth surface is reflection. Refraction passes through, diffraction bends around, and scattering bounces off a non-smooth surface.

18. When an RF signal bounces off a smooth, nonabsorptive surface, the behavior is A. Refraction B. Reflection C. Scattering D. Diffraction