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Cisco Wireless

Chapter 7

QuestionAnswer
A wireless NIC performs the same functions as a wired NIC except that ________. it uses an antenna instead of a wired connection
Wireless NICs are available in what formats? PCI card, CF cards, and mini PCI
What are the functions of an AP? It sends and receives signals, connects to the wired network, and has special bridging software.
What is the range of an AP acting as the base station? 375 feet
What is the highest data rate for an 802.11 diffused infrared WLAN? 1 or 2 Mbps
What are the IEEE 802.11 standards that outline the specifications for infrared WLANs based on? RF transmissions
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
In ad hoc mode, the wireless clients communicate directly with the AP. True or False? False
An Extended Service Set (ESS) is two or more BSS wireless networks. True or False? True
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?
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.
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
Some vendors have already integrated the components of a wireless NIC directly onto the notebook's __________. motherboard
A modulation technique that translates two data bits into 4 light impulses 4-pulse position modulation (4-PPM)
A modulation technique that translates four data bits into 16 light impulses. 16-pulse position modulation (16-PPM)
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
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
The process of sending frames to gather information. active scanning
A WLAN mode in which wireless clients communicate directly among themselves without using an AP. ad hoc mode
A frame sent by a client to an AP that contains the client's capabilities and supported rates. associate request frame
A WLAN mode that consists of wireless clients and one AP. Basic Service Set (BSS)
The process that the AP uses to temporarily store frames for clients that are in sleep mode. buffering
The different ways of sharing resources in a network environment. channel access methods
The scrambling of data that occurs when two computers start sending messages at the same time in a shared frequency. collision
A small expansion card that is used with PDA devices. compact flash (CF) card
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)
MAC frames that assist in delivering the frames that contain data. control frames
MAC frames that carry the information to be transmitted to the destination clients. data frames
A frame sent by the new AP to the old AP to terminate the old AP's association with the client. disassociation frame
The default access method for WLANs. distributed coordination function (DCF)
The standard interval between the transmission of data frames. distributed coordination function interframe space (DIFS)
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
A WLAN mode that consists of wireless clients and multiple APs Extended Service Set (ESS)
The division of data to be transmitted from one large frame into several smaller frames. fragmentation
A WLAN mode in which wireless clients communicate directly among themselves without using an AP. Independent Basic Service Set (IBSS)
A WLAN mode that consists of wireless clients and one AP. infrastructure mode
Time gaps used for special types of transmissions. interframe spaces (IFS)
MAC frames that are used to set up the initial communications between a client and the AP. management frames
A small card that is functionally equivalent to a standard PCI expansion card used for integrating communications peripherals onto a notebook computer. Mini PCI
The response that a client sends back to the AP to indicate that the client has no transmissions to make. null data frame
A procedure for reducing collisions by requiring the receiving station to send an explicit packet back to the sending station. packet acknowledgment (ACK)
The process of listening to each available channel for a set period of time. passive scanning
A WLAN mode in which wireless clients communicate directly among themselves without using an AP. peer-to-peer mode
The 802.11 optional polling function. point coordination function (PCF)
A channel access method in which each computer is asked in sequence whether it wants to transmit. polling
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
A technology that provides power over an Ethernet cable. power over Ethernet (PoE)
A frame sent by a client when performing active scanning. probe
A frame sent by an AP when responding to a client's active scanning probe. probe response
The process of a client dropping a connection with one AP and reestablishing the connection with another. reassociation
A frame sent from a client to a new AP asking whether it can associate with the AP. reassociation request frame
An 802.11 protocol option that allows a station to reserve the network for transmissions. Request to Send/Clear to Send (RTS/CTS)
The process that a client uses to examine the airwaves for information that it needs in order to begin the association process. scanning
A small expansion card that is used with PDA devices. secure digital card (SD)
A unique identifier assigned to an AP. Service Set Identifier (SSID)
A time gap used for immediate response actions such as ACK. short interframe space (SIFS)
An external attachment for a PDA that permits external cards to attach to the device. sled
A power-conserving mode used by notebook computers. sleep mode
A smaller unit of a network. subnet
The measurement unit in a PLCP frame. The length of which is predefined by the standard or specification for a particular system. time slot
A list of the stations that have buffered frames waiting at the AP. traffic indication map (TIM)
802.11b WLANs that pass the organization's interoperability tests. Wi-Fi
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
Created by: 1592245141