Chapter 7
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| A wireless NIC performs the same functions as a wired NIC except that ________. | it uses an antenna instead of a wired connection
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| Wireless NICs are available in what formats? | PCI card, CF cards, and mini PCI
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| What are the functions of an AP? | It sends and receives signals, connects to the wired network, and has special bridging software.
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| What is the range of an AP acting as the base station? | 375 feet
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| What is the highest data rate for an 802.11 diffused infrared WLAN? | 1 or 2 Mbps
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| What are the IEEE 802.11 standards that outline the specifications for infrared WLANs based on? | RF transmissions
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| Power over Ethernet delivers power to an AP through the unused wires in a standard unshielded twisted pair (UTP) Ethernet cable. True or False? | True
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| In ad hoc mode, the wireless clients communicate directly with the AP. True or False? | False
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| An Extended Service Set (ESS) is two or more BSS wireless networks. True or False? | True
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| On a regular basis, wireless clients will survey all the radio frequencies to determine if a different AP can provide better service. True or False? |
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| The IEEE ________ standard defines a local area network that provides cable-free data access for clients that are either mobile or in a fixed location at a rate up to 2 Mbps. |
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| Because all of the IEEE WLAN features are isolated in the PHY and ______ layers, any network operating system or LAN application will run on a WLAN without any modification necessary. | MAC
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| Some vendors have already integrated the components of a wireless NIC directly onto the notebook's __________. | motherboard
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| A modulation technique that translates two data bits into 4 light impulses | 4-pulse position modulation (4-PPM)
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| A modulation technique that translates four data bits into 16 light impulses. | 16-pulse position modulation (16-PPM)
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| An IEEE standard released in 1990 that defines wireless local area networks at a rate of either 1 Mbps or 2 Mbps. All WLAN features are contained in the PHY and MAC layers. | 802.11 standard
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| a 1999 addition to the IEEE 802.11 standard for WLANs that added two higher speeds, 5.5 Mbps and 11 Mbps. Also known as Wi-Fi. | 802.11b standard
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| The process of sending frames to gather information. | active scanning
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| A WLAN mode in which wireless clients communicate directly among themselves without using an AP. | ad hoc mode
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| A frame sent by a client to an AP that contains the client's capabilities and supported rates. | associate request frame
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| A WLAN mode that consists of wireless clients and one AP. | Basic Service Set (BSS)
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| The process that the AP uses to temporarily store frames for clients that are in sleep mode. | buffering
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| The different ways of sharing resources in a network environment. | channel access methods
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| The scrambling of data that occurs when two computers start sending messages at the same time in a shared frequency. | collision
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| A small expansion card that is used with PDA devices. | compact flash (CF) card
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| A table containing 64 8-bit code words used for transmitting at speeds above 2 Mbps. This table of codes is used instead of the process of adding a Barker code to the bit to be transmitted. | Complementary Code Keying (CCK)
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| MAC frames that assist in delivering the frames that contain data. | control frames
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| MAC frames that carry the information to be transmitted to the destination clients. | data frames
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| A frame sent by the new AP to the old AP to terminate the old AP's association with the client. | disassociation frame
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| The default access method for WLANs. | distributed coordination function (DCF)
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| The standard interval between the transmission of data frames. | distributed coordination function interframe space (DIFS)
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| A function of an AP that allows it to automatically select the highest transmission speed based on the strength and quality of the signal received from a client NIC. | DYNAMIC RATE SELECTION
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| A WLAN mode that consists of wireless clients and multiple APs | Extended Service Set (ESS)
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| The division of data to be transmitted from one large frame into several smaller frames. | fragmentation
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| A WLAN mode in which wireless clients communicate directly among themselves without using an AP. | Independent Basic Service Set (IBSS)
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| A WLAN mode that consists of wireless clients and one AP. | infrastructure mode
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| Time gaps used for special types of transmissions. | interframe spaces (IFS)
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| MAC frames that are used to set up the initial communications between a client and the AP. | management frames
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| A small card that is functionally equivalent to a standard PCI expansion card used for integrating communications peripherals onto a notebook computer. | Mini PCI
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| The response that a client sends back to the AP to indicate that the client has no transmissions to make. | null data frame
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| A procedure for reducing collisions by requiring the receiving station to send an explicit packet back to the sending station. | packet acknowledgment (ACK)
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| The process of listening to each available channel for a set period of time. | passive scanning
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| A WLAN mode in which wireless clients communicate directly among themselves without using an AP. | peer-to-peer mode
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| The 802.11 optional polling function. | point coordination function (PCF)
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| A channel access method in which each computer is asked in sequence whether it wants to transmit. | polling
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| An 802.11 standard that allows the mobile client to be off as much as possible to conserve battery life but still not miss out on data transmissions. | power management
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| A technology that provides power over an Ethernet cable. | power over Ethernet (PoE)
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| A frame sent by a client when performing active scanning. | probe
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| A frame sent by an AP when responding to a client's active scanning probe. | probe response
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| The process of a client dropping a connection with one AP and reestablishing the connection with another. | reassociation
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| A frame sent from a client to a new AP asking whether it can associate with the AP. | reassociation request frame
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| An 802.11 protocol option that allows a station to reserve the network for transmissions. | Request to Send/Clear to Send (RTS/CTS)
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| The process that a client uses to examine the airwaves for information that it needs in order to begin the association process. | scanning
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| A small expansion card that is used with PDA devices. | secure digital card (SD)
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| A unique identifier assigned to an AP. | Service Set Identifier (SSID)
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| A time gap used for immediate response actions such as ACK. | short interframe space (SIFS)
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| An external attachment for a PDA that permits external cards to attach to the device. | sled
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| A power-conserving mode used by notebook computers. | sleep mode
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| A smaller unit of a network. | subnet
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| The measurement unit in a PLCP frame. The length of which is predefined by the standard or specification for a particular system. | time slot
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| A list of the stations that have buffered frames waiting at the AP. | traffic indication map (TIM)
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| 802.11b WLANs that pass the organization's interoperability tests. | Wi-Fi
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| A combination of several technologies that permit home users to have wireless capabilities and also allow Internet and printer sharing and provide better security than connecting a computer directly to the Internet. | wireless residential gateway
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