Troubleshooting common wireless Issues Flashcards
Which of the following is a value measuring the power of a wireless signal?
a. RSSI
b. SSID
c. RFI
d. CSMA/CA
Answer: a. Received signal strength indication (RSSI) is an excellent metric
for measuring the strength of the received wireless signal.
Which of the following are the most common sources of radio frequency
interference (RFI) in a wireless network? (Choose three.)
a. Gaming consoles
b. Fax machines
c. Microwave ovens
d. Baby monitors
e. Bluetooth
Answer: a, c, d. Fax machines and Bluetooth are the technologies in this list
that are least likely to cause interference with wireless networks. Gaming consoles, microwaves, and baby monitors are the most common sources of RFI in
wireless networks.
Which metric provides the best idea of how a wireless network is actually
performing?
a. Throughput
b. Speed
c. Relative jitter
d. Availability
Answer: a. Speed is the theoretical maximum data rate for wireless. Throughput is a measure of the actual data that can be sent through the network.
A satellite dish antenna is an example of what type of wireless antenna?
a. Omnidirectional
b. Integrated
c. Beam-formed
d. Unidirectional
Answer: d. A unidirectional antenna directs the bulk of its signal in a specific direction. In contrast, an omnidirectional antenna sends the signal in a
360-degree coverage area around the antenna.
What is the name for a web page that is presented to wireless clients seeking
access to a network?
a. Authentication server
b. Captive portal
c. Self-registration gateway
d. Supplicant client
Answer: b. A captive portal is a web page that asks clients seeking access
to agree to organizational policies and typically captures information from
clients.
Which of the following should you consider conducting before designing and
deploying a high-performance WLAN infrastructure?
a. Site survey
b. Reconnaissance
c. Nmapping
d. Port scan
Answer: a. A site survey can be a critical aid in implementing wireless network
infrastructure. During a site survey, key issues can be tested for, such as excessive interference in certain areas.
A target wireless client has been disconnected from the company AP and associated with a rogue device. What has most likely occurred?
a. Disassociation
b. Propagation
c. Incorrect AP placement
d. Misconfigured parameter
Answer: a. Disassociation is often an initial step in a much larger attack. Once
the client is disassociated, it can be associated to a rogue device.
To maintain coverage between areas, you need to have overlapped coverage areas among wireless APs using nonoverlapping channels. In the United
States, what channels in the 2.4GHz band of frequencies should you use?
a. CSMA/CA channels
b. 1, 6, and 11
c. EIRP channels
d. 2, 7, and 12
Answer: b. The coverage areas of wireless APs using overlapping channels
should not overlap. To maintain coverage between coverage areas, you should
have overlapping coverage areas among wireless APs using nonoverlapping
channels (for example, channels 1, 6, and 11 for wireless networks using the
2.4GHz band of frequencies).
