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Cisco Wireless
Chapter 7
| Question | Answer |
|---|---|
| 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 |
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