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CompTIA Network+ (N10-008) > Troubleshooting Wireless Networks (5.4) > Flashcards

Troubleshooting Wireless Networks (5.4) Flashcards

1
Q

Bandwidth

A

o Theoretical speed of data going across the network

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2
Q

Throughput

A

o Actual speed of data on the network

CHECK PICTURE

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3
Q

Received Signal Strength Indication (RSSI)

A

▪ Estimated measure of the power level that a radio frequency client
device is receiving from a wireless access point or wireless router

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4
Q

Effective Equivalent Isotropic Radiated Power (EIRP)

A

▪ Maximum power radiated from an ideal isotropic antenna, given its
antenna gain, and the transmitter power of the radio frequency system

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5
Q

Decibels over isotropic (dBi)

A

▪ Tells signal strength being radiated from a wireless access point

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6
Q

Vertical Antenna

A

▪ Radio frequency waves extend outward in all directions away from the
antenna and the wireless access point at an equal power level

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7
Q

Dipole Antenna

A

▪ Produces radio frequency waves extending outward in two directions

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8
Q

Yagi Antenna

A

▪ A unidirectional antenna that sends the radio frequency waves in only
one direction

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9
Q

Parabolic Grid Antenna

A

▪ Allows the radio waves to be transmitted in only one direction over a
longer distance than a Yagi antenna
▪ Choose a parabolic or Yagi antenna for site-to-site connections
▪ For indoor use, you are more likely to use omnidirectional and
unidirectional antennas

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10
Q

Polarization

A

▪ The orientation of the electric field (or transmission) from the antenna
▪ Most Wi-Fi networks use vertical polarization

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11
Q

o Channel Utilization

A

▪ A statistic or measure of the amount of airtime utilization that occurs for
a particular frequency or channel
▪ Keep channel utilization under 30% to have a faster wireless network
▪ Access points and clients form a single broadcast domain when they
operate on the same channel

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12
Q

Clear Channel Assessment (CCA)

A

▪ Listens to see if another device is actively transmitting on the channel
before attempting to send frames on that channel
▪ High channel utilization leads to slower throughput for wireless networks

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13
Q

Site Survey

A

▪ Process of planning and designing a wireless network to provide the
required wireless solution
● Configure devices to use less utilized channels
● Ensure proper coverage of the entire work areas
● Ensure wireless network is not being blocked or interfering with
physical obstacles within the building

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14
Q

How does a site survey work?

A
  1. Wireless client sends a probe request to discover any 802.11
    wireless networks in proximity to itself
  2. Receiving access point checks to see if it can support the data rate
    the client requested
  3. Wireless client sends a low-level 802.11 authentication frame to
    the access point to begin authentication
  4. Access point receives authentication frame and responds with an
    acknowledgement to continue the handshake
  5. Wireless client chooses the access point it wants to associate with
    and sends an association request
  6. Access point processes the association request if the information
    sent matches its capabilities
  7. Client is fully connected and associated and can now conduct any
    data transfer it needs and use the wireless network
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15
Q

Basics steps

A 
● Scan airwaves
● Find access points
● Request association
● Authenticate
● Contact DHCP server
▪ Clients should be located in high signal strength areas to speed up the
association process
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16
Q

Coverage

A 
▪ A measure of how much area around a wireless transmitter is there
sufficient signal strength for wireless devices to utilize
● Client
● RSSI (decibel)
● Access Point
▪ EIRP (dBi)
▪ Signal booster
▪ Larger antenna
▪ Wireless repeater
▪ Second access point
17
Q

Interference

A

▪ Occurs when multiple wireless networks communicate on the same
channel using the same frequency
▪ Use channels 1, 6, and 11 in the 2.4 GHz spectrum
▪ Ensure a 10-15% overlap between access points for sufficient coverage

18
Q

Attenuation

A

▪ Reduction of signal strength between the transmission and receipt of the
signal

19
Q

Multipath Reception

A

▪ Occurs when the transmitted signal bounces off walls and other physical
objects and then is redirected to the receiver

20
Q

Idle Timeout

A

▪ Occurs when there’s no traffic within 300 seconds
▪ Send a keep alive packet every few minutes to
remain connected

21
Q

Session timeout

A

▪ Occurs when there’s no traffic within 1800 seconds

22
Q

Wireless network change

A

▪ Occurs whenever the wireless local area network is

changed

23
Q

Manual deletion

A

▪ Occurs whenever a client is removed by an

administrator

24
Q

Authentication timeout

A

▪ Occurs when the authentication or key exchange

process fails to finish in time

25
Q

Access point radio reset

A

▪ Occurs when a change is made to the wireless

network

26
Q

Deauthentication Attack

A

▪ A common wireless attack used by hackers to disassociate wireless clients
and make them attempt to reconnect to the access point

27
Q

Wrong SSID

A

▪ Service Set Identifier (SSID) is a natural language name used to identify a
wireless network in an 802.11 network

28
Q

Incorrect passphrase

A

▪ Passphrase/ Pre-Shared Key is used to encrypt and decrypt data sent and
received by a wireless network

29
Q

Encryption mismatch

A 
▪ Occurs when the client and the access point are using different
encryption types
● WEP – RC4
● WPA – TKIP
● WPA2 – AES

▪ To fix this, attempt to reinstall the drivers for your wireless adapter
● Change protocol type
● Disable antivirus tools
● Reinstall drivers

30
Q

Encryption mismatch

A 
▪ Occurs when the client and the access point are using different
encryption types
● WEP – RC4
● WPA – TKIP
● WPA2 – AES

▪ To fix this, attempt to reinstall the drivers for your wireless adapter
● Change protocol type
● Disable antivirus tools
● Reinstall drivers

31
Q

Captive Portal

A

▪ A web page displayed to newly-connected Wi-Fi users before being
granted broader access to network resources

32
Q

HTTP Redirect

A

▪ Redirects all traffic to a web server which then redirects them to a
captive portal using a 302 HTTP status code

33
Q

ICMP Redirect

A

▪ Sends error messages and operational information indicating the success
or failure of communicating with another IP address

34
Q

DNS Redirect

A

▪ The client is redirected by the onboard DNS server to the captive portal
webpage
● Open a web browser and try to go to any website, such as
Google.com or Facebook.com

● If that doesn’t work, determine your default gateway for the
wireless network and enter http:// and the default gateway’s IP
address, then press enter

● If that doesn’t work, then verify your DNS server IPs are not set to
something manually like 8.8.8.8, and instead allow DHCP to
autoconfigure your DNS server when connecting to the wireless
network
o Then, reattempt step 1, opening a web browser and going
to any website again

CompTIA Network+ (N10-008) (23 decks)

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