CWNA
Terms
undefined, object
copy deck
- lightning arrestors
- Cannot handle a direct lightning strike and will discharge transient current to an Earth ground connection
- types of antennas
- Grid, Parabolic Dish, Ground plane, Yagi, Patch, Panel, and Omni
- security level offered by Point-to-Point Tunneling Protocol (PPTP)
- PPTP tunnels and encrypts data, but the original IP connection is still open to attack without a personal firewall in place.
- Free Space Path Loss
- RF signal amplitude degradation as a propagated wave moves through an empty area
- deauthentication frames on OFDM
- cause intermittent connectivity of authorized client computers when utilized by attackers and are deployed by WLAN switches and WIPS as a rogue containment tool
- Dynamic Rate Switching (DRS)
- Changes the modulation and spreading code types used for data transmission
- HR/DSSS (802.11b) and ERP (802.11g)
- Have a maximum of 3 non-overlapping channels in the 2.4 GHz ISM band
- BSS is initiated
- when a single access point begins transmitting beacons
- Independent Basic Service Set (IBSS) is initiated
- When client stations begin transmitting beacons
- EAP-TLS and PEAP-EAP-TLS
- both support only x.509 certificates as the only client identification credential option
- The 802.11-1999 (2003) standard
- specifies Open System Authentication and Shared Key Authentication
- Transmitter burnout and Decreased or erratic RF signal amplitude
- Are problems that occur as a result of a high Voltage Standing Wave Ratio (VSWR)
- Radio Frequency Line-of-Sight
- When a point-to-point link\'s transmission quality and strength are decreased by Fresnel Zone blockage
- How much of the 2.4 GHz ISM band\'s spectrum is used by an IEEE 802.11-compliant FHSS system authorized for use by the FCC (US), IC (Canada), and ETSI (Europe), excluding Spain and France?
- Center frequencies between 2.402 GHz and 2.480 GHz (79 center frequencies)
- the terminology used by the IEEE 802.11-2007 standard for one or more Basic Service Sets connected by a distribution system
- Extended Service Set
- Passive scanning in an IBSS
- consists only of stations listening to beacons from other stations to gather information about the IBSS.
- advantage of using IEEE 802.3-2005, Clause 33 Power over Ethernet (PoE)
- Time and cost savings when positioning access points across an indoor enterprise environment.
- Which protocol is NOT supported on an HR/DSSS wireless LAN
- ISDN
- the amount of time spent by a wireless LAN radio on a particular frequency in an FHSS system
- Dwell time
- result of a DUAL CTS bit existing in the HT Information Element (IE) field of a beacon
- Stations will start every transmit opportunity with an RTS frame addressed to the access point
- What statements are true regarding the Service Set Identifier (SSID)
- maximum length of 32 bytes, and it is case sensitive and WLAN switches have the ability to set the SSID field in the beacon frame to a null value
- What information should be included in the RF site survey report?
- RF interference source type and location findings and Infrastructure equipment placement suggestions based on optimal coverage patterns within the facility
- What does NOT cause degradation to propagating RF waves in 802.11 environments?
- Nearby high-power EMF from power lines
- What feature is specified in the 802.11i-2004 amendment to support fast roaming of client devices between autonomous access points
- Preauthentication with PMK caching
- Most 802.11 wireless LAN system components, including transceivers, amplifiers, splitters, cables, attenuators, and antennas have __ ohm impedence
- 50 ohm impedance
- In an Independent Basic Service Set (IBSS), what happens to frames destined for dozing wireless stations?
- They are buffered at the transmitting station
- Which solutions can be applied to the \'hidden node\' problem with wireless LANs?
- Increase output power on client stations and Remove interfering obstacles between clients
- What conditions must be met for a Wi-Fi client to take advantage of WMM Power Save?
- The client AND access point must meet Wi-Fi CERTIFIED for WMM Power Save specifications and Latency-sensitive applications must support WMM Power Save
- a key principle of RF propagation and communication
- Signal strength and signal quality do not always go hand-in-hand
- mini-PCIe cards can be used for
- both client connectivity and protocol analysis. However, this function requires a separate driver to be loaded that initiates an RF Monitor mode on the card.
- In what situation would use of 802.11 frame fragmentation increase WLAN throughput by decreasing frame retransmission?
- When a source of RF interference is near the ERP-OFDM transmitter or receiver
- To qualify as 802.3-2005, Clause 33-compliant
- a powered device (PD) must be able to accept power either using alternative A (over data lines) or alternative B (unused pairs). It must be able to reply with a detection signature, and it may optionally reply with a classification signature.
- An RTS/CTS handshake is accomplished between which two network entities in a BSS?
- Immediate wireless receivers
- Distributed Coordination Function (DCF) mode
- is synonymous with use of the CSMA/CA medium access protocol and SIFS is used between frames in a fragment burst
- Wireless Intrusion Prevention System (WIPS), RF spectrum analyzer and Laptop protocol analyzer
- are used to calculate a baseline throughput analysis
- Regulatory bodies that govern radio spectrum use for wireless LAN technologies determine what factors in each regulatory domain?
- Frequency band licensing, RF Output power limits, Appropriate RF band use
- Seeing CF-Poll and CF-ACK frames
- means These frames are corrupted, and the protocol analyzer is misinterpreting the remaining frame fragments.
- How does a station operating in Point Coordination Function (PCF) mode gain priority over stations not capable of PCF mode?
- It acknowledges frames sent to it by the Point Coordinator