Wireless routing Flashcards

1
Q

802.11b WLAN routing protocol

A
  • most widely deployed wireless standard
  • operate at 2.4 ghz radio ban 11mps data rate
  • has the ability to data-rate-shift while moving, and transmission by transmission basis
    -means access point an support multiple clients at varying speeds
    -uses CSMA?CA and Request to send, clear to send (RTS?CTS)
    Has interference
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2
Q

802.11g

A

-backwards compatable with 802.11b
- 54mbps max data rate
- runs on 5 + 2.4 ghz range
can communicate on same network
uses module technique called OFDM- better performance at same rate
gets 70% of RF bandwidth

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3
Q

Wifi channels for 802.11g

A

11 configurable channels

  • 1,6,11- non overlapping
  • must be aware of channels when installing AP to not overlap channels
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4
Q

802.11a

A

-5ghz
can data rate shift
- 12 non-overlapping channels
immune to interferences eg microwave, Bluetooth

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5
Q

802.11h

A

5ghz
FCC added 11 channels
gained 23 non-overlapping channels

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6
Q

Dynamic frequency selection (DFS)

A
  • monitors a device operating range for any radar signals allowed to operate in 5ghz proportions
  • if dfc discovers radar signals it will either: abandon channel, mark it unavailable to prevent interference
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7
Q

Transmit power control (TPC)

A
  • employed by the mobile phone industry

- can set client machine adapter + access point to cover various size ranges

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8
Q

Radio frequencies

A

go straight with signal

  • if anything blocking hard to send signal
  • can lose all or part of a signal
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9
Q

Reflection

A

the signal bounces off material that cant absorb the signal
objects can scatter signal
-

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10
Q

Wireless degredation

A
  • factors that interfere with RF (Radio frequency)
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11
Q

what is fading?

A

signal weakening due to reflection

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12
Q

Attenuation

A

signal weakening due to distance

can correct with an extender

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13
Q

noise

A

interference from other devices

common due to unlicensed spectrum

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14
Q

wireless fidelity

A

devices communicate directly
- communication managed through wireless access points
-WAPS may interoperate to provide large seamless coverage
max distance 300 ft station with wap
max distance b/w waps 1000ft w/ antenna

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15
Q

Antenna types

A

omni directional

unidirectional

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16
Q

what is omnidirectional antenna type

A

the signal transmitted in all 3 directions equally

17
Q

Uni directional

A

signal transmitted in one direction

typically used to gain range

18
Q

Wifi identifiers

A

-Service set identifier (SSID)
-\basic service set identifier (BSSID)
Basic service set (BSS)
Extended servce set identifier (ESSID)

19
Q

Extended servce set identifier (ESSID)

A

WLAN name that spans many BSS’s

same WLAN name as SSID

20
Q

Basic service set (BSS)

A

A wap and all stations communicating with it

21
Q

-basic service set identifier (BSSID)

A

one for each WLAN for each radio on WAP using mac address

wap typically has many bssid’s

22
Q

-Service set identifier (SSID)

A

WLAN IDENTIFIER

may be more than one a wap

23
Q

Wireless standard frequencies

A
  1. 11b 2.4 ghz - max throughput- 11mbit/s
  2. 11g 2.4 ghz - max throughput- 54mbit/s
  3. 11n 5+ 2.4 ghz - max throughput- 150mbit/s