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Network+ > Section 21: Troubleshooting Wireless Networks > Flashcards

Section 21: Troubleshooting Wireless Networks Flashcards

1
Q

What is Throughput?

A

Actual speed of data on the network

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2
Q

What is the bandwidth, throughput, and distance indoors/outdoors for 802.11a?

A

54 Mbps, 20-30 Mbps, 35 m/100 m

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3
Q

What is the bandwidth, throughput, and distance indoors/outdoors for 802.11b?

A

11 Mbps, 5-7 Mbps, 35 m/100 m

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4
Q

What is the bandwidth, throughput, and distance indoors/outdoors for 802.11g?

A

54 Mbps, 30-32 Mbps, 35 m/100 m

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5
Q

What is the bandwidth, throughput, and distance indoors/outdoors for 802.11n?

A

600 Mbps, 140-150 Mbps, 70 m/250 m

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6
Q

What is the bandwidth, throughput, and distance indoors/outdoors for 802.11ac?

A

1300 Mbps, 100-500 Mbps, 50 m/100 m

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7
Q

What is the bandwidth, throughput, and distance indoors/outdoors for 802.11ax?

A

10 Gbps, 600-900 Mbps, 50 m/100 m

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8
Q

What is the 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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9
Q

What is the 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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10
Q

What is a 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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11
Q

What is a Dipole Antenna?

A

Produces radio frequency waves extending outward in two directions

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12
Q

What is a Yagi Antenna?

A

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

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13
Q

What is a Parabolic Grid Antenna?

A

Allows the radio waves to be transmitted in only one direction over a longer distance than a Yagi antenna

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14
Q

What is Polarization regarding antennas?

A

The orientation of the electric field (or transmission) from the antenna

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15
Q

For site-to-site connections, which antenna should you use?

A

Parabolic or Yagi

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16
Q

For indoor use, what type of antenna should be used?

A

Omnidirectional and Unidirectional

17
Q

What is Channel Utilization?

A

A statistic or measure of the amount of airtime utilization that occurs for a particular frequency or channel.

18
Q

What is a Site Survey?

A

The process of planning and designing a wireless network to provide the required wireless solution

19
Q

What is an AP Association Time?

A

When an end user has been on an access point for an amount of time.

20
Q

What is Coverage?

A

A measure of how much area around a wireless transmitter is there sufficient signal strength for wireless devices to utilize

21
Q

What is an Interference?

A

Occurs when multiple wireless networks communicate on the same channel using the same frequency

22
Q

How much overlap percentage between access points is enough for sufficient coverage?

A

10-15%

23
Q

What is Attenuation?

A

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

Can happen for antennas and radio frequency

24
Q

What is a Service Set Identifier (SSID)?

A

A natural language name used to identify a wireless network in an 802.11 network

25
Q

What is a Passphrase/Pre-Shared Key (PSK)?

A

Used to encrypt and decrypt data sent and received by a wireless network

26
Q

What is an Encryption Mismatch?

A

Occurs when the client and the access point are using different encryption types

27
Q

What is a Captive Portal?

A

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

28
Q

What are Client Disassociation Issues?

A

Idle Timeout, Session Timeout, Wireless Network Change, Manual Deletion, Authentication Timeouts, Access Point Radio Reset

29
Q

What is an Idle Timeout?

A

Occurs when there’s no traffic within 300 seconds

30
Q

What is a Session Timeout?

A

Occurs when there’s no traffic within 1800 seconds

31
Q

What is a Wireless Network Change?

A

Occurs whenever the wireless local area network is changed

32
Q

What is a Manual Deletion?

A

Occurs whenever a client is removed by an administrator

33
Q

What is an Authentication Timeout?

A

Occurs when the authentication or key exchange process fails to finish in time

34
Q

What is an Access Point Radio Reset?

A

Occurs when a change is made to the wireless network

35
Q

What are some Captive Portal Issues?

A

HTTP Redirect, ICMP Redirect, DNS Redirect

36
Q

What is HTTP Redirect?

A

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

37
Q

What is an ICMP Redirect?

A

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

38
Q

What is a DNS Redirect?

A

The client is redirected by the onboard DNS server to the captive portal webpage

Network+ (22 decks)

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