Section 21: Troubleshooting Wireless Networks Flashcards
What is Throughput?
Actual speed of data on the network
What is the bandwidth, throughput, and distance indoors/outdoors for 802.11a?
54 Mbps, 20-30 Mbps, 35 m/100 m
What is the bandwidth, throughput, and distance indoors/outdoors for 802.11b?
11 Mbps, 5-7 Mbps, 35 m/100 m
What is the bandwidth, throughput, and distance indoors/outdoors for 802.11g?
54 Mbps, 30-32 Mbps, 35 m/100 m
What is the bandwidth, throughput, and distance indoors/outdoors for 802.11n?
600 Mbps, 140-150 Mbps, 70 m/250 m
What is the bandwidth, throughput, and distance indoors/outdoors for 802.11ac?
1300 Mbps, 100-500 Mbps, 50 m/100 m
What is the bandwidth, throughput, and distance indoors/outdoors for 802.11ax?
10 Gbps, 600-900 Mbps, 50 m/100 m
What is the Received Signal Strength Indication (RSSI)?
Estimated measure of the power level that a radio frequency client device is receiving from a wireless access point or wireless router
What is the Effective Equivalent Isotropic Radiated Power (EIRP)?
Maximum power radiated from an ideal isotropic antenna, given its antenna gain, and the transmitter power of the radio frequency system
What is a Vertical Antenna?
Radio frequency waves extend outward in all directions away from the antenna and the wireless access point at an equal power level
What is a Dipole Antenna?
Produces radio frequency waves extending outward in two directions
What is a Yagi Antenna?
A unidirectional antenna that sends the radio frequency waves in only one direction
What is a Parabolic Grid Antenna?
Allows the radio waves to be transmitted in only one direction over a longer distance than a Yagi antenna
What is Polarization regarding antennas?
The orientation of the electric field (or transmission) from the antenna
For site-to-site connections, which antenna should you use?
Parabolic or Yagi
For indoor use, what type of antenna should be used?
Omnidirectional and Unidirectional
What is Channel Utilization?
A statistic or measure of the amount of airtime utilization that occurs for a particular frequency or channel.
What is a Site Survey?
The process of planning and designing a wireless network to provide the required wireless solution
What is an AP Association Time?
When an end user has been on an access point for an amount of time.
What is Coverage?
A measure of how much area around a wireless transmitter is there sufficient signal strength for wireless devices to utilize
What is an Interference?
Occurs when multiple wireless networks communicate on the same channel using the same frequency
How much overlap percentage between access points is enough for sufficient coverage?
10-15%
What is Attenuation?
Reduction of signal strength between the transmission and receipt of the signal
Can happen for antennas and radio frequency
What is a Service Set Identifier (SSID)?
A natural language name used to identify a wireless network in an 802.11 network
What is a Passphrase/Pre-Shared Key (PSK)?
Used to encrypt and decrypt data sent and received by a wireless network
What is an Encryption Mismatch?
Occurs when the client and the access point are using different encryption types
What is a Captive Portal?
A web page displayed to newly-connected Wi-Fi users before being granted broader access to network resources
What are Client Disassociation Issues?
Idle Timeout, Session Timeout, Wireless Network Change, Manual Deletion, Authentication Timeouts, Access Point Radio Reset
What is an Idle Timeout?
Occurs when there’s no traffic within 300 seconds
What is a Session Timeout?
Occurs when there’s no traffic within 1800 seconds
What is a Wireless Network Change?
Occurs whenever the wireless local area network is changed
What is a Manual Deletion?
Occurs whenever a client is removed by an administrator
What is an Authentication Timeout?
Occurs when the authentication or key exchange process fails to finish in time
What is an Access Point Radio Reset?
Occurs when a change is made to the wireless network
What are some Captive Portal Issues?
HTTP Redirect, ICMP Redirect, DNS Redirect
What is HTTP Redirect?
Redirects all traffic to a web server which then redirects them to a captive portal using a 302 HTTP status code
What is an ICMP Redirect?
Sends error messages and operational information indicating the success or failure of communicating with another IP address
What is a DNS Redirect?
The client is redirected by the onboard DNS server to the captive portal webpage