What is the range of transmission for a WPAN? 10 feet 2. At what rate is the number of wireless hostpots increasing each year? 350% 3. Which of the following technologies came first chronologically? leased transmission lines 4. A Bluetooth network that contains one master and at least one slave device forms a ____. piconet 5. If an organization s data processing center becomes inoperable, it can move all data processing operations to a ____, often within an hour. Hot site 6____ give team-based workers the ability to access the network resources that they need while collaborating in a team environment.
WLANs 7. What is the maximum transmission distance for FSO? 4 miles 8. Where must a WiMax transmitter be located? on the roof of a building 9Why is a WLAN less expensive for business than a wired LAN? no need to tunnel through walls and ceilings to install cable 10. The ____ technology has a transmission distance of up to 10 meters. Bluetooth 11. A WAP cell phone runs a tiny browser program called a microbrowser that uses Wireless Markup Language (WML) instead of HTML.
True 12. An increasingly ____ workforce is one characteristic of today s business world. mobile 13.
A large amount of equipment is required to create a wireless LAN. False 14What aspect of RF may produce biological damage? heating effects 15How many millions of bits per second can be transmitted in a Wi-Fi network? 11 16. An employee who purchases an access point and secretly brings it into the office in order to provide personal wireless access has installed what is known as a ____ access point. rogue 17. When a Web server sends a Web page back to a PC, it is only sending HTML code; the ____ is responsible for interpreting that code and displaying the results on the screen. Web browser 18.
Which sector of the economy has adopted wireless technology most completely? travel 19. In a wireless network, the ____ acts as a base station to receive the signals and transmit signals back to the wireless network interface cards in the other wireless devices. access point 20. A cold site is a fully functional office space generally run by a commercial disaster recovery service that allows a business to continue computer and network operations to maintain business continuity. False 21. Some airlines use WLAN technology to communicate with the aircraft once it has parked or is taxiing on the ground.
True 22. ____ is a low-power wireless data and voice transmission technology. Bluetooth 23. Where can a RFID tag be read? anywhere within the range of a transmitted radio signal 24. What type of device is used for communication in a fixed broadband wireless network? antenna 25. It is well documented that high levels of RF can produce biological damage. True Chapter 2 1. What is another name for a NIC? client network adapter 2. Microsoft Windows has become the ____ standard operating system today for personal desktop computers and network servers. de facto 3.
Which type of remote wireless bridge connection is used to connect multiple LAN segments together? point-to-multipoint 4. How does an access point receive electrical power if it is mounted in a location that is not close to an electrical outlet? through the unused wires in a standard unshielded twisted pair (UTP) Ethernet cable 5. Ultimately, who regulates standards that are developed by consortia? the marketplace 6. De facto standards are not actually standards at all. True 7. What is the name for the computer network architecture standards developed by the IEEE? Project 802 8.
If a remote wireless bridge is in repeater mode it functions as a standard AP only and does not communicate with other remote wireless bridges. False 9. CF cards consist of a small circuit board that contains flash memory chips and a dedicated controller chip. True 10. Only one type of wireless NIC is available for laptop computers. False 11. The 802. 11b standard can support wireless devices that are up to ____ meters apart. 115 12. Most bridges have what is known as ____ that minimizes the spread of the signal so that it can reach farther distances. delay spread 13.
A device called a ____ must sometimes be attached to a PDA in order to establish a wireless connection. The device contains a slot for a wireless NIC or similar device. sled 14. Most industry experts recommend one access point for no more than ____ users if they are performing basic e-mail, light Web surfing, and occasionally transferring medium-sized files. 50 15. The IEEE 802. 11g draft was a compromise based on input from several different chip (microprocessor) manufacturers, who had a major stake in the outcome. True 16. What function is performed by a wireless gateway?
Authentication, Encryption, and bandwidth management 17. The IEEE 802. 11 standard outlines the use of ____ transmissions for WLANs. diffused infrared 18. If a remote wireless bridge is set to ____, it can only transmit to another bridge in root mode. non-root mode 19. What is a disadvantage of standards? they can open domestic markets in larger countries to overseas competition 20. Beginning with Windows ____, all Microsoft desktop operating systems recognize a wireless NIC without the need for any external software drivers. XP 21. The radio frequency spectrum is divided into ____ different sections or bands. 50 22. When a business is registered as a ____ they are qualified be placed in an online database of wireless hotspot locations. Wi-Fi Zone 23. Which IEEE committee establishes standards for wireless wide area networks? 802. 16 24. Which of the following statements describes the difference between a CF wireless NIC and a PC card? PC card is larger than CF 25. A(n) ____ card improves input/output speed over a PC Card by increasing the bus width to 32 bits yet still supports lower-voltage PC Cards. CardBus Chapter 3 1. Which of the following units is used to measure frequency? hertz 2.
Which type of RF loss is caused by the equipment transmitting the signal? Voltage Standing Wave Ratio 3. Which of the following types of wave is imperceptible? radio 4. ____ polarization is typically used in wireless LANs with the dual antennas of access points pointing upward. Vertical 5. A basic rule of thumb is that each 6 dB increase in EIRP results in a quadrupling of the transmission range (distance from the antenna), and a 6 dB reduction in EIRP translates into reducing the range by four. False 6. In a wireless transmission data travels on invisible radio waves. True 7.
Which digital modulation technique is similar to frequency modulation? frequency shift keying 8. A ____ dipole antenna produces a flatter signal than a standard dipole antenna. high-gain 9. The maximum EIRP for IEEE 802. 11b WLANs is ____ mW. 100 10. ____ antennas are used for long distance, point-to-point wireless links, such as connecting buildings that are up to 42 kilometers (25 miles) apart. Highly-directional 11. ____ can occur intentionally from an external power source that amplifies the signal, or unintentionally when an RF signal bounces off an object and combines with the original signal to amplify it.
Gain 12. When a digital signal needs to be transmitted over an analog medium, such as when a computer needs to send digital signals over an analog telephone line or TV cable, a device known as a(n) ____ is used. modem 13. When an RF signal moves from one medium to another of a different density the signal actually bends instead of traveling in a straight line. This is known as ____. refraction 14. The length of an antenna should be about ____ the wavelength. 1/4 15. Highly-directional antennas are generally concave dish-shaped devices.
True 16. Which of the following is an electromagnetic wave? Light, Heat, and Radio 17. What is the free space loss (in dB) for IEEE 802. 11b and 802. 11g WLANs when the distance in meters is 100? 80 18. Whenever a wave completes its trip and returns back to the starting point it has finished two cycles. False 19. ____ modulation changes the number of waves representing one cycle. Frequency 20. Television uses three types of modulation. The video portion uses ____. AM 21. What is a problem with measuring RF loss using a linear scale? t does not reveal what the loss is in relation to the whole 22. The ASK 1 bit has a carrier signal (positive voltage) while a 0 bit has no signal (zero voltage). True 23. Electromagnetic waves travel freely through space in all directions at the speed of light, or approximately ____ per second. 186,000 miles 24. A loss of 10 decibels means that ____ percent of the power has been lost in mW. 90 25. The term ____ describes the rate of electrical flow. Current Chapter 4 1. Increasing the speed of the WLAN will cause shorter delays in waiting for reflections. False 2.
When using the Shared Wireless Access Protocol, devices can be as far as 45 meters (150 feet) apart and can send and receive data at rates up to ____ Mbps. 10 3. In FHSS, the amount of time needed to move from one frequency to another is the ____ time. hop 4. How does OFDM work? signals are broken up and the parts are sent in parallel 5. The value of layers in the OSI reference model is that it divides networking into a series of tasks, and then illustrates how those tasks relate to each other. True 6. The 802. 11b standard specifies ____ frequencies that can be used, beginning at 2. 12 GHz. 14 7. The ____ field of an 802. 11a frame consists of 10 repetitions of a short training sequence signal and two repetitions of a long training sequence signal. Synchronization 8. Which layer of the OSI reference model permits the devices on the network to hold ongoing communications across the network? session 9. DSSS uses a bit pattern called a ____ code. chipping 10. IEEE has divided the ____ layer into two sublayers: Logical Link Control (LLC) and Media Access Control (MAC). Data Link 11. What techniques are used by vendors to achieve 2x mode for transmissions?
Combine two frequency channels, use different coding rate schemes and reallocating the individual carriers. 12. Bluetooth divides the 2. 4 GHz frequency into ____ different frequencies spaced 1 GHz apart. 79 13. What is the top layer of the OSI reference model? application 14. ____ signals by nature transmit on only one frequency or a very narrow portion of the frequencies. Radio 15. Because a device must wait to transmit until it receives the last reflected signal, this in effect puts a ceiling limit on the overall speed of the WLAN. What is the current ceiling for WLAN speed? etween 10 and 20 Mbps 16. Of the 52 subchannels, 32 are used for standard transmissions and 20 are used for FEC transmissions. False 17. When was the concept used by FHSS technology developed? during World War II 18. Into which layers are WLAN features isolated by IEEE standards? PHY and MAC 19. Which system is preferred for 802. 11b WLANs? DSSS 20. According to FCC regulations, all FHSS systems in the 900 MHz band must change frequencies through 50 channels and cannot spend more than ____ on one frequency each 20 seconds. 400 milliseconds 21.
The ____ coding technique consists of a set of 64 8-bit code words. complementary code keying 22. What is a disadvantage of narrowband transmissions? interference from another radio signal 23. When transmitting with FHSS, if interference is encountered on a particular frequency then that part of the signal will be retransmitted on the previous frequency of the hopping code. False 24. Because wireless technology has advanced at such a rapid pace, the earliest WLANs are now essentially obsolete. True 25. The Physical Layer Convergence Procedure (PLCP) standards for 802. 11b are based on ____. DSSS
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