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| Wireless devices operate using ____________________ signals, creating the potential for two types of signal interference. |
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| ____ give team-based workers the ability to access the network resources that they need while collaborating in a team environment. |
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| 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. |
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| What type of device is used in the medical field to diagnose digestive problems without surgery? |
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| 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. |
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| What is the range of transmission for a WPAN? |
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| 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. |
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| What is the maximum transmission distance for FSO? |
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| A(n) ____________________ cable connects the AP to a wired LAN or to the Internet. |
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| With ____________________ broadband, also known as WiMax, the signal is transmitted between the antennas of the buildings at speeds up to 75 Mbps and at distances up to 53 kilometers (35 miles). |
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| An increasingly ____ workforce is one characteristic of today’s business world. |
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| wireless application protocol |
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| provides a standard way to transmit, format, and display Internet data for devices like cell phones and handheld devices |
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| alternative to high-speed fiber optic transmissions |
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| small radio transceivers built onto microprocessor chips |
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| unauthorized individuals actively searching for wireless signals to pick up |
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| wireless transmissions between devices that cannot be mobile |
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| special software that helps identify other Bluetooth devices |
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| radio frequency identification |
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| tags used to identify items |
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| translates between WML and HTML |
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| 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. |
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| What aspect of RF may produce biological damage? |
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| What type of device is used for communication in a fixed broadband wireless network? |
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| A WAP cell phone runs a tiny browser program called a microbrowser that uses Wireless Markup Language (WML) instead of HTML. |
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| If an organization’s data processing center becomes inoperable, it can move all data processing operations to a ____, often within an hour. |
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| Some airlines use WLAN technology to communicate with the aircraft once it has parked or is taxiing on the ground. |
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| leased transmission lines |
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| Which of the following technologies came first chronologically? |
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| anywhere within the range of a transmitted radio signal |
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| Where can a RFID tag be read? |
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| Remote wireless ____________________ are ideal solutions for connecting sites such as satellite offices, remote campus settings, or temporary office locations when the sites are separated by obstacles such as bodies of water, freeways, or railroads that make using a wired connection impractical or very expensive. |
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| Ultimately, who regulates standards that are developed by consortia? |
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| Microsoft Windows has become the ____ standard operating system today for personal desktop computers and network servers. |
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| If a remote wireless bridge is set to ____, it can only transmit to another bridge in root mode. |
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| through the unused wires in a standard unshielded twisted pair (UTP) Ethernet cable |
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| How does an access point receive electrical power if it is mounted in a location that is not close to an electrical outlet? |
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| The 802.11b standard can support wireless devices that are up to ____ meters apart. |
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| 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. |
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| 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. |
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| they can open domestic markets in larger countries to overseas competition |
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| What is a disadvantage of standards? |
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| What function is performed by a wireless gateway? |
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| A(n) ____________________ is a small card that is functionally equivalent to a standard PCI expansion card. |
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| The IEEE 802.11 standard outlines the use of ____ transmissions for WLANs. |
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| CF cards consist of a small circuit board that contains flash memory chips and a dedicated controller chip. |
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| ____________________ bands are in effect bands of the radio spectrum that are available nationwide to all users, without requiring a license. |
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| An access point has a(n) ____ wired network interface that allows it to connect by cable to a standard wired network. |
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| Access points are typically mounted on a(n) ____________________ to reduce interference from surrounding objects. |
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| Only one type of wireless NIC is available for laptop computers. |
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| What is the name for the computer network architecture standards developed by the IEEE? |
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| The radio frequency spectrum is divided into ____ different sections or bands. |
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| Television uses three types of modulation. The video portion uses ____. |
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| 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. |
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| it does not reveal what the loss is in relation to the whole |
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Definition
| What is a problem with measuring RF loss using a linear scale? |
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| The length of an antenna should be about ____ the wavelength. |
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| Which digital modulation technique is similar to frequency modulation? |
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| ____ modulation changes the number of waves representing one cycle. |
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| Voltage Standing Wave Ratio |
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Definition
| Which type of RF loss is caused by the equipment transmitting the signal? |
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| A(n) ____________________ is a copper wire or similar device that has one end up in the air and the other end connected to the ground or a grounded device. |
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| Whenever a wave completes its trip and returns back to the starting point it has finished two cycles. |
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| Which of the following units is used to measure frequency? |
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| ____ antennas are used for long distance, point-to-point wireless links, such as connecting buildings that are up to 42 kilometers (25 miles) apart. |
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| RF power gain and loss on a relative scale are measured in ____________________ instead of mW. |
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| The maximum EIRP for IEEE 802.11b WLANs is ____ mW. |
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| The term ____ describes the rate of electrical flow. |
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| ____ polarization is typically used in wireless LANs with the dual antennas of access points pointing upward. |
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| A ____ dipole antenna produces a flatter signal than a standard dipole antenna. |
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| 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 ____. |
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| Highly-directional antennas are generally concave dish-shaped devices. |
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| Electromagnetic waves travel freely through space in all directions at the speed of light, or approximately ____ per second. |
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| DSSS uses a bit pattern called a ____ code. |
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| 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. |
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| What techniques are used by vendors to achieve 2x mode for transmissions? |
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| What is the top layer of the OSI reference model? |
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| Although 54 Mbps is the “official” top speed of 802.11a, the IEEE specification also allows for higher speeds. These higher speeds are known as ____________________ mode or 2X mode. |
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| The amount of time that a transmission occurs on a specific frequency is called the ____________________ time. |
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| 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? |
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| 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. |
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| When was the concept used by FHSS technology developed? |
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| Users can upgrade from an 802.11b network to a faster 802.11g network simply by replacing the ____________________. |
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| ____ is not part of a frame. |
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| The Physical Layer Convergence Procedure (PLCP) standards for 802.11b are based on ____. |
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| signals are broken up and the parts are sent in parallel |
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| 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. |
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| Which system is preferred for 802.11b WLANs? |
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| Because wireless technology has advanced at such a rapid pace, the earliest WLANs are now essentially obsolete. |
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| interference from another radio signal |
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| What is a disadvantage of narrowband transmissions? |
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| In FHSS, the amount of time needed to move from one frequency to another is the ____ time. |
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| 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. |
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| direct sequence spread spectrum |
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Definition
| uses an expanded redundant code to transmit each data bit |
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| frequency hopping spread spectrum |
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| uses a range of frequencies that change during the transmission |
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| transmits a secondary copy along with the primary information |
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| sends signals to the network or receives signals from the network |
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| quadrature phase shift keying |
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Definition
| can double the amount of data encoded over PSK to 250 Kbps per channel, which produces a 12 Mbps (250 Kbps x 48) data rate |
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| ensures that error-free data is given to the user |
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| two channels are combined (one for sending data and the other for receiving) to provide the necessary frequency for the higher speeds |
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| orthogonal frequency division multiplexing |
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| sending multiple signals at the same time |
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| picks the route packets take and handles addressing of packets for delivery |
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| voltage multiplied by the current |
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| orientation of the radio waves as they leave the antenna |
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| rate at which an event occurs |
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| bending caused by an object in the path of the transmission |
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| changes to a signal that can be made to enable it to carry information |
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| equal to current times resistance |
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| negative difference in amplitude between signals |
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| occurs when the RF signal comes in contact with elements in the air, such as rain or heavy dust particles |
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| serves as the primary regulatory agency for wireless communications in the United States and its territorial possessions |
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| device that connects the computer to the network so that it can send and receive data |
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| device that combines wireless management and security in a single appliance |
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| type of solid-state (microchip) storage technology in which there are no moving parts |
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| common practices that the industry follows for various reasons, ranging from ease of use to tradition to what the majority of the users do |
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| small card that is functionally equivalent to a standard PCI expansion card |
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| standards that are controlled by an organization or body that has been entrusted with that task |
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| device that is used to connect two network segments together |
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| world’s largest technical professional society with members around the globe |
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