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71.
Bluetooth devices use ____________ , which can potentially cause interference with WLANs.
  • A.
    Bluetooth spread spectrum (BTSS)
  • B.
    Orthogonal frequency division multiplexing (OFDM)
  • C.
    Direct-sequence spread spectrum (DSSS)
  • D.
    Frequency hopping spread spectrum (FHSS)
  • Answer & Explanation
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Answer : [D]
Explanation :
Bluetooth operates in the 2.4 GHz band and can cause interference with WLAN devices that operate in the 2.4 GHz band, including FHSS, DSSS, and OFDM.
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72.
OFDM that is used with 802.11a and 802.11g stations (STA) supports a maximum data rate of ________ Mbps.
  • A.
    11
  • B.
    21
  • C.
    33
  • D.
    54
  • Answer & Explanation
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Answer : [D]
Explanation :
OFDM can be used in 802.11a or ERP-OFDM used in 802.11g and supports a maximum data rate of 54 Mbps. 802.11b supports a maximum data rate of 11 Mbps. OFDM is also used with 802.11n devices, but the maximum data rate is 600 Mbps.
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73.
Which wireless LAN technology can be used to obtain the highest data transfer rate possible?
  • A.
    DSSS
  • B.
    Ethernet
  • C.
    HT-OFDM
  • D.
    OFDM
  • Answer & Explanation
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Answer : [C]
Explanation :
HT-OFDM used in IEEE 802.11n can support data rates as high as 600 Mbps, OFDM used in 802.11a supports a maximum of 54 Mbps, and DSSS supports a maximum of 11 Mbps. Ethernet is not a wireless LAN technology.
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74.
Which frequency ranges are used in an IEEE 802.11a-compliant wireless LAN? (Choose two.)
  • A.
    900 MHz ISM range
  • B.
    2.40 GHz ISM range
  • C.
    5.25 GHz UNII range
  • D.
    5.35 GHz UNII range
  • Answer & Explanation
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Answer : [C, D]
Explanation :
IEEE 802.11a wireless LANs operate in the 5 GHz UNII bands. 802.11b/g wireless LANs operate in the 2.4 GHz ISM band.
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75.
Stations (STA) operating in which two IEEE 802.11 amendments are interoperable?
  • A.
    802.11 and 802.11a
  • B.
    802.11a and 802.11b
  • C.
    802.11a and 802.11g
  • D.
    802.11b and 802.11g
  • Answer & Explanation
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Answer : [D]
Explanation :
When referenced from a distribute list, OSPF filters routes from being added to that router's IP routing table but has no impact on the flow of LSAs. As such, neither A nor B is correct. An OSPF distribute-list command does attempt to filter routes from being added to the IP routing table by OSPF, so the two answers that mention the IP routing table might be correct.
Sequence number 5 matches prefixes from 10.1.2.0 through 10.1.2.255, with prefix lengths in the range 25–27, and denies (filters) those prefixes. So, the prefix list will match 10.1.2.0/26 with the first line, with a deny action.
The 10.1.2.0/24 subnet does not match the first line of the prefix list, but it does match the third line, the match all line, with a permit action. Because 10.1.2.0/26 is matched by a deny clause, this route is indeed filtered, so it is not added to R1’s IP routing table. 10.1.2.0/24, matched with a permit clause, is allowed and would be in the IP routing table.
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