Term
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Definition
| The height from the top peak to the bottom peak of a waveform |
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Term
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Definition
| Which WLC interface provides wireless service for clients |
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Term
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Definition
| Name the passive device that reduces the RF signal |
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Term
| Authentication server (AS) |
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Definition
| What kind of server authenticates users or clients based on their credentials |
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Term
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Definition
| Term for a contiguous range of frequencies |
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Term
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Definition
| What do you call the range of frequencies used by a single channel |
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Term
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Definition
| What is the 11-bit sequence of encoded bits that represent a single data bit |
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Term
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Definition
| Basic Service Set Identifier - i.e the AP's MAC address |
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Term
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Definition
| Basic Service Set - which is the AP cell basically |
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Term
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Definition
| What is the measure of the angle of a radiation pattern in both the E and H planes. (where the signal strength is 3 dB below the maximum value) |
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Term
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Definition
| What feature permits a burst of data frames to be followed by a single acknowledgment message |
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Term
| What does block acknowledgement do |
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Definition
| Improves throughput, by only requiring 1 ack mesg |
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Term
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Definition
| Acronym for the basic data rate that is required between the AP and client |
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Term
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Definition
| Control and Provisioning of Wireless Access Points |
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Term
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Definition
| A lightweight AP sends a mesg to discover any wireless LAN controllers. |
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Term
| What does a CAPWAP discovery request return |
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Definition
| A CAPWAP Discovery Response message |
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Term
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Definition
| A message sent by a lightweight AP to a specific WLC indicating the APs desire to join the controller. After the discovery phase is completed. |
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Term
| A successful CAPWAP join request is replied to with what |
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Definition
| The WLC returns a CAPWAP Join Response |
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Term
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Definition
| The basic, steady RF signal that is used to carry information |
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Term
| What is a Cell (or Basic Service Area) |
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Definition
| The area of wireless coverage provided by an AP |
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Term
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Definition
| The arbitrary index that points to a specific frequency within a band |
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Term
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Definition
| A chip is a pulse of a direct-sequence spread spectrum (DSSS) code. ex: one up / up wave pulse = 1 and one up/ down = 0 |
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Term
| Cisco Compatibility Extensions (CCX) is what |
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Definition
| A wireless device certification that verifies compatibility with Cisco. |
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Term
| How many versions of CCX exist |
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Definition
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Term
| Clear channel assessment (CCA) does what |
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Definition
| What devices use to decide if a channel is clear / available to use |
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Term
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Definition
| The ID the WLC assigns to a non-802.11 device which is interfering with an AP. (related to a pseudo-MAC address) |
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Term
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Definition
| Converts simple data bits into multiple encoded bits before transmission. |
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Term
| What does a Coder function provide |
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Definition
| Provides resilience against noise and interference |
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Term
| Collision avoidance does what |
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Definition
| Allows AP's and clients to proactively avoid collisions on a channel |
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Term
| Complementary Code Keying (CCK) |
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Definition
| A encoding method that takes 4 or 8 data bits at a time to create a 6-bit or 8-bit symbol. |
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Term
| CCK symbols are handed off into _____ to _____. |
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Definition
| The CCK symbols are fed into (DQPSK) to (modulate the carrier signal.) |
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Term
| Contention window does what |
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Definition
| Decides the total amount of time a wireless client waits before transmitting a frame |
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Term
| Counter/CBC-MAC Protocol (CCMP) defines what protocol use |
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Definition
| Defines the use of AES counter mode for encryption and CBC-MAC for data integrity |
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Term
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Definition
| The gain of an antenna, as compared to a simple dipole antenna |
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Term
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Definition
| The gain of an antenna, as compared to an isotropic reference antenna |
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Term
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Definition
| The power level of a dB signal when compared to a reference signal power of 1 milliwatt |
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Term
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Definition
| Dynamic channel allocation |
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Term
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Definition
| The RRM algorithm that monitors APs in an RF group and adjusts their channel assignment when there are poor RF conditions |
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Term
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Definition
| A logarithmic function that compares one absolute measurement to another |
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Term
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Definition
| Delivery Trafficc Indication Message |
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Term
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Definition
| A beacon sent at regular intervals. It indicates if buffered broadcast and multicast frames will be sent to clients in power save mode |
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Term
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Definition
| A wireless receiver who interpreting changes in the carrier signal to recover the original information being sent |
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Term
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Definition
| Differential binary phase shift keying |
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Term
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Definition
| Modulating 1 bit of encoded data and commit a binary phase shift of the carrier signal |
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Term
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Definition
| Differential quadrature phase shift keying |
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Term
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Definition
| Modulate 2 bits of encoded data and changes the phase in one of four ways ( aka a quad phase shift) |
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Term
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Definition
| A RF signal going through a opaque object. I.E waves bending around an object. |
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Term
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Definition
| An omnidirectional antenna with two wire segments |
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Term
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Definition
| Direct Sequence Spread Spectrum |
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Term
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Definition
| When a transmitter uses a single fixed wide channel to send data. (aka sending a direct sequence throughout the spectrum) |
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Term
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Definition
| An antenna that propagates the RF signal in a narrow range of direction |
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Term
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Definition
| Distributed coordination function |
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Term
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Definition
| Wireless devices coordinating the use of a wireless channel |
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Term
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Definition
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Term
| Describe a distribution system (DS) |
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Definition
| When a wired ethernet connection connects an AP and transports traffic between a wired and wireless network |
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Term
| What does the Distribution system port connect |
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Definition
| A physical interface that connects the WLC to a switched network |
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Term
| What kind of information does the Distribution system port carry |
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Definition
| It carries both AP and management traffic |
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Term
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Definition
| A measure of the percentage of time a device transmits on a given frequency |
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Term
| What does the Dynamic interface connect. (is it logical or physical) |
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Definition
| The internal logical link that connects a VLAN to the WLAN. |
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Term
| What kind of information does the dynamic interface pass through |
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Definition
| Traffic passing through a dynamic interface also passes through a VLAN on a distribution system port. |
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Term
| Dynamic rate shifting does what |
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Definition
| Changes the modulation coding scheme (MCS) according to dynamic RF signal conditions |
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Term
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Definition
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Term
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Definition
| EAP Flexible Authentication by Secure Tunneling |
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Term
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Definition
| A Cisco authentication method that is based on EAP |
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Term
| What does EAP-FAST use for outer authentication |
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Definition
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Term
| What does EAP-FAST use for inner authentication |
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Definition
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Term
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Definition
| Extensible Authentication Protocol |
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Term
| EAP-TLS uses what kind of authentication |
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Definition
| Certs on both server and supplicant |
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Term
| EAP-TLS uses what for authentication and key exchanges |
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Definition
| TLS tunnel is used during client authentication and key exchanges |
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Term
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Definition
| Effective Isotropic Radiate Power |
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Term
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Definition
| Transmitter + cable + antenna = usable dBm (measured at the antenna) |
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Term
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Definition
| 802.1x EAP-based authentication requirement for WPA or WPA2 |
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Term
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Definition
| Elevation plane. It shows a side view of the radiation pattern |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Using Cisco CleanAir to trigger the RRM DCA process interference automatically |
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Term
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Definition
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Term
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Definition
| When multiple APs are connected by a common switched infrastructure |
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Term
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Definition
| Extensible Authentication Protocol |
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Term
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Definition
| A authentication framework used with other authentication measures |
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Term
| Transmission types: DFS does what and is used with 801.11 (?) |
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Definition
| 802.11a - detects radar signals that need to be protects against interference |
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Term
| Transmission types: OFDM does what and is used with what standard |
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Definition
| 802.11g encodes bits on 4x carrier frequencies - 802.11g |
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Term
| Transmission types: DSSS does what and is used with 801.11 (?) |
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Definition
| 802.11b transmit larger then needed to ensure carrier transmission, only type supported on 802.11b |
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Term
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Definition
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Term
| U-NII band 2 covers what range |
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Definition
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Term
| U-NII band 2-extended covers what range |
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Definition
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Term
| U-NII band 4 covers what range |
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Definition
| 5.725 - 5.825ghz and ISM (scientific / reserved bands) |
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Term
| Speed of 802.11-1997 version |
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Definition
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Term
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Definition
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Term
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Definition
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Term
| what is the DBi gain of a dipole antenna |
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Definition
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Term
| What is the elevation degree of a monopole antenna |
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Definition
| 50 degrees. omnidirectional. I.E |
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Term
| BSSID's are map to what on the AP |
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Definition
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Term
| What are CAPWAP tunnels used for |
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Definition
| Layer 3 controller roaming ( iOS 7.3.112.0). I.E letting the AP talk to the WLC via IP packets. |
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Term
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Definition
| ip-setup utility, used for deploying AP's |
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Term
| Maximal ratio combining is used with what 802.11 spec and does what |
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Definition
| 802.11n signals from each channel are added together to produce 1 stable signal. (Single radio transmitter used, multiple channels) |
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Term
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Definition
| the width of a frequency within the channel. ex: there is 11mhz of separation between channel 40 and 42 in the 5ghz channel. |
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Term
| H plane shows what kind of view of the radiation pattern |
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Definition
| top down view of radiation pattern. |
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Term
| What is done before transmission to verify clean air? |
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Definition
| CCA - clear channel assessment |
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