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Sybex test problem questions

Dustin Sanders Networking CWNA English 131 cards

Cards in this deck (131)

  1. 1What technology is good for directly connecting two wi-fi deviceswi-fi direct
  2. 2What wifi alliance certs are required before a wi-fi radio can be certified voice enterprise compliant?WMM-Power Save
    WPA2-Enterprise
    WWM-Admission Control
  3. 3Which of these are regulated by the gov? Frequency, bandwidth, max Tx power, Max EIRP, indoor/outdoor use?All except indoor/outdoor use
  4. 4Wifi alliance is responsible for which of the following cert programs: WECA Voice Personal 802.11v WAVE WMM-PSVoice Personal
    WMM-PS
  5. 5How many degrees make up a wave?360
  6. 6What are the advantages of using unlicensed bands? No regulations no added cost anyone can use it no rulesno added cost
    anyone can use it
  7. 7What are some results of multipath interference? Scattering Delay upfade excessive retransmissions absorptionupfade
    excessive retransmissions
  8. 8Can upfade ever make a signal stronger than what it was originally transmitted at?nope
  9. 9what 3 things are related: frequency, amplitude, phase, speed of lightfrequency
    phase
    speed of light
  10. 10does the height of an antenna factor into a link budget?nope
  11. 11the highest RF signal strength transmitted from an antenna is known as what?EIRP
  12. 12is dBm relative or absolute?absolute
  13. 13What's the best practice to deal with a low SNR that you can't change?Plan coverage cells with a 5db fade margin
  14. 14can semi directional antennas also be used for short-medium range p2p connections?Yes
  15. 15Fresnel blockage should never go above what %?40%
  16. 16What dictates the size of the fresnel zone? Antenna beamwidth RF line of site Distance FrequencyDistance
    Frequency
  17. 17can an 802.11a/b/g ap transmit from multiple transceivers at the same time?nope
  18. 18what is the ration between maximum peak voltage and minimum peak voltage on a line called?VSWR
  19. 19What are some possible negative effects of impedance mismatch? voltage reflection erratic signal strength decreased signal amplitude amplifier/transmitter failure blockage of fresnel zone(all but blockage)
    voltage reflection
    erratic signal strength
    decreased signal amplitude
    amplifier/transmitter failure
  20. 20Can cables work with any frequency?nope. Select the cable that is right for the frequency you're using
  21. 21Amplifiers can be purchased with which of the following features? Bidirectional amplification unidirectional amplification fixed gain fixed outputall of the above
  22. 22lightning arrestors defend against what?transient currents
    (not direct strikes)
  23. 23The radius of the 2nd fresnel zone isThe area where the signal is out of phase with the point source
    larger than the first fresnel zone
  24. 24The 802.11-2012 standard using ERP-DSSS/CCK radio supports what data rates?1, 2, 5.5, & 11 Mbps
  25. 25Which amendment defines wireless mesh networking mechanism?802.11s
  26. 26What are the required data rates of an OFDM station?6, 12, 24, 54Mbps
  27. 27What 802.11 amendments allow for throughput of 1Gbps or higher?802.11ac
    802.11ad
  28. 28is OFDM compatible with ERP?nope
  29. 29802.11a is compatible with what other standard?802.11h
  30. 30What is the maximum OFDM rate?54 Mbps
  31. 31What security options were available in the 2003 revised 802.11 standard?Open System authentication
    Shared key authentication
    WEP
  32. 32802.11u is also know for what?Wireless Internetworking with External Networks
    u-Wien
  33. 33802.11-2012 defines what two technologies for QoS?EDCA
    "Hybrid Coordination Function Controlled Channel Access"
  34. 34802.11h (rolled into 802.11-2012) introduced what two major changes to 5Ghz?U-NII-2 Extended
    Radar detection
  35. 35802.11b defined what PHY?HR-DSSS
  36. 36What are the valid ISM bands?902-928mhz
    2.4-2.5ghz
    5.725-5.875ghz
  37. 37What technologies are used in the 2.4Ghz ISM band? FHSS ERP DSSS HR-DSSSall of the above
  38. 38In the U-NII-1 band, what is the center frequency of channel 40?5.2Ghz
  39. 39What is the channel and band of a transmission whose center frequency is 5.3Ghz?U-NII-2 channel 60
  40. 40How much serparation is needed between center frequencies of channesl in the U-NII-2 extended band?20MHz
  41. 41What spread spectrum tech specified data rates of 22Mbps and 33 Mbps?ERP-PBCC
  42. 42How many 20 MHz channels can an AP running OFDM in 5Ghz support?25
  43. 43What is the average amount of aggregate throughput percentage at any data rate when legacy 802.11a/b/g radios are transmitting?50%
  44. 44What are the names to additional U-NIII bands that provide for 195 MHz of additional spectrum at 5 GHz?U-NII-2B
    U-NII-4
  45. 45What frequencies are 802.11n radios not allowed to transmit at so they avoid doppler weather radar?5.60-5.65 GHz
  46. 46What two modulation types are used by OFDM?QAM
    Phase
  47. 47a wireless 802.11 network is now by what type of address?BSSID
    Extended service set ID
  48. 48does 802.11 define a medium to be used in a distribution system?nope
  49. 49What is the default config mode that allows an AP to operate in a BSS?root mode
  50. 50What service set defines mechanisms for mesh networking?MBSS
  51. 51DCF is also known as what?Distributed Coordination Function
    &
    CSMA/CA
  52. 52ACK frames and CTS-to-self frames follow what interframe space?SIFS
  53. 53What is a clear channel assessment?listens to see if channel is clear
  54. 54What does a station do after the carrier sense check and determined that no other devices are transmitting for a period of a difs interval?select a random backoff value
  55. 55What is PCF?Point coordination function
  56. 56What is DIFS?The period of time the medium has to be quiet before a STA can transmit.
  57. 57PCF functions in what kind of network environments?BSS
    Infrastructure mode
    won't work in ad hoc mode or IBSS
  58. 58802.11e defines what medium access methods to support Qos?Enhanced Distributed Channel Access
    Hybrid Coordination Function
    Hybrid Coordination Function Controlled-Access
  59. 59What information from a wired network is used to assign traffice into access categories on a wlan controller?802.1d priority tags
  60. 60What are two reasons 802.11 radios use physical carrier sense?to sync incoming transmissions
    to assess the RF medium
  61. 61What are EDCA priority queues called?Access categories
  62. 62how is an immediate block ACK different from a delayed block ACKImmediate block ACK for latency sensitive traffic (voice)
    delayed block ACK ok for less latency sensitive stuff
  63. 63how are associations frames different from reassociation frames?only association frames are used to join a BSS
  64. 64What kind of frame contains only LLC data and the IP packet, but no 802.11 data?MSDU
  65. 65RTS/CTS and CTS-to-Self are both what?protection mechanisms
  66. 66What kind of info comes back in a probe response?Time stamp
    supported data rates
    service set capabilities
    SSID
  67. 67If a STA sees it's AID set to 1 in the TIM, what is the next frame it sends?PS-Poll to get the buffered data because it was asleep
  68. 68When a STA in in powersave mode, how does it know if an AP has buffered frames for it?it checks the TIM field
  69. 69when will an ERP(802.11g) AP send a probe response to a request from an HR-DSSS (802.11b) STA?when the SSID field is null
  70. 70WMM-PS is based on what power management method?U-APSD
  71. 71What kind of 802.11 radio is used in mobile devices?intergrated single chip
  72. 72how many root bridges exist in a p2p bridge link?1
  73. 73On what type of network architecture is an NMS useful? Autonomous centralized decentralized?all of the above
  74. 74what logical plane is defined by protocols and intelligence?control plane
  75. 75What is the likely cause of two bridges in a p2p network not associating with each otherboth are set to nonroot
  76. 76what wlan architectures need 802.1q tagging on the edge of the network when there are multiple vlans?autonomous and distributed
    centralized doesn't need it
  77. 77what is a split MACsplit media access control
    some functions performed in AP, some in controller
  78. 78can the channel be configured as part of a parameter on a wlan profile?nope
    that's set in the AP group profile
  79. 79What are some necessary components of a VoWifi architecture?VoWiFi phones
    WMM support
    PBX
  80. 80manufacturing and warehouse environments really require what from their wireless networks?mobility and coverage
  81. 81hospitals often use what 3 802.11 applications?VoWifi
    RTLS
    patient monitoring
  82. 82What scenarios might result in hidden node problems?Distributed antenna system
    coverage cells that are too large
    physical obstruction
  83. 83what could cause frames to be corrupted near an AP, but not corrupted near a the STA?mismatched power settings
    (STA isn't broadcasting strong enough and the frames get corrupted by the time they get to the AP)
  84. 84If there's no wlan controller, what acts as the home agent when a device layer 3 roams?the original AP
  85. 85Why should you disable the lowest data rates on a b/g/n AP?Medium contention
    Hidden nodes
  86. 86what standards and certifications call for use of CCMP/AES?802.11-2012
    WPA2
  87. 87128bit WEP uses a static key of what size?104 bits
  88. 88802.11 legacy defines what security solution64 bit static WEP
  89. 89What wireless security solutions are defined by wi-fi protected access?Passphrase authentication
    TKIP/RC4
  90. 90What are the 3 main components of a RBAC?users
    roles
    permissions
  91. 91What does 802.1x/EAP provide?access to network resources
    dynamic encryption-key generation
    verification of user credentials
  92. 92What must occure to generate dynmaic TKIP/RC4 or CCMP/AES encryption keys?802.1x/EAP authentication and a 4-way handshake
    PSK authentication and a 4-way handshake
  93. 93when using a wireless controller solution, what device usually acts as the authenticator?the controller
  94. 94Temporal Key Integrity protocol uses what bit temporal key, and what bit IV?128-bit temporal key
    4-bit IV
    with message integrity check
  95. 95What are the 4 classifications WIPS uses for devicesInfrastructure
    Known
    Rouge
    unknown
  96. 96what additional recommendations can be made after a survey?training and security recommendations
  97. 97what needs to be considered when planning for capacity and coverage in a 5ghz wlan?data applications
    user density
    peak usage level
    dfs channels
  98. 98what might be needed when installing outdoor APs for coverage?NEMA enclosure
    patch antennas
    ruggedized core switch
  99. 99What is an Erlang?a unit of measurement equal to 1 hour of telephone traffic in 1 hour of time
  100. 100What else is usually provided as a final site survey deliverable?bill of materials
    implementation design
    project schedule and costs
  101. 101What are some common causes of RF interference in hospitals?medical equipment
    safety glass with metal mesh inside
    elevator shafts
  102. 102what type of coverage analysis requires a radio to be associated with an AP?active
  103. 103do ovens fuck with 5Ghz?nope, they're in the 2.4GHz spectrum
  104. 104802.3af and 802.3at amendments are what clause devices?clause 33
  105. 105if a classification signature is not provided, a PoE device is considered to be at what class?0
    gets 15.4watts
  106. 106power devices have to be able to take how many VOLTS (not watts)57volts
  107. 107what is the range of maximum power used by a class 4 PD?12.95 to 25.5watts
  108. 108what is max power draw of a 802.at PD?25.5
  109. 109what is max power draw of class 0 PD12.95watts (even though class 0 gets 15.4W)
  110. 110what is the highest comminication rate for a 1x1:1 802.11n radio?65Mbps
  111. 111what 802.11n power management method powers down all but 1 radio?SM power save
  112. 112How can HT radio increase the throughput at the MAC sublayer of the Data-Link layerA-MSDU
    RIFS
    a-MPDU
    MTBA (block ACK)
  113. 113What HT protection modes allow only the associated of HT stations?Modes 0, 1, 2
  114. 114what mechanisms doe 802.11n radios use for transmit diversity?Space-time block coding (STBC)
    Cyclic shift diversity (CDS)
  115. 115What HT PPDU formats support both 20MHz and 40MHz channels?HT Mixed format
    HT Greenfield
  116. 116what 802.11n mode of operations sends the same data on two adjacent 20mhz channels?non-HT duplicate mode
  117. 117when a 160Mhz wide channel is used, how many primary channels are defined?3
    20mhz
    40mhz
    80mhz
  118. 118how many bits are represented by each sub carrier in 256-QAM?8
  119. 119how many MCSs are mandatory in 802.11ac?0-7
  120. 120what is the max spatial streams and devices an 802.11ac AP can communicate with?8 spatial streams, 4 devices
  121. 121what technologies are apart of explicit beam forming?Feedback matrix
    steering matrix
    null data packet
  122. 122What factors does an MCS use to define data rates for VHT?modulation method
    coding rates
  123. 123what is considered manadatory for phase 1 of wifi-certified AC?MCS 0-7
    two spatial streams
    long guard interval
  124. 124what is the max spatial streams for a single 802.11ac client?4
  125. 125in a guest firewall policy, what are some of the ports that are recommended to be permitted?UDP 53
    TCP 443
    UDP 4500
  126. 126What are some components within an MDM architecture?APs
    APNs
    GCM
  127. 127how can you install a certificate onto 802.1x suplicants?group policy or over the air MDM
  128. 128what can you see about a device using an MDM server?battery life
    installed applications
    device capacity
  129. 129what protocol does iOS and Mac OS use for over the air provisioning of MDM profiles with certificates and SSL encryption?SCEP
  130. 130What mechanism can be used if the guest vlan is not supported at the edge of the network and only resides in a DMZ?GRE
  131. 131what attributes can a NAC server user to ID and set permissions for a user?Posture
    DHCP fingerprinting
    Radius attributes

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questions I got wrong on the 180 question sybex cwna test
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Dustin Sanders
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