ABC Company has a 2.4 and 5 GHz WLAN deployment. DFS functionality is enabled as required by the
regulatory domain and APs use DFS channels as long as radar is not detected. Band steering is also
enabled to encourage dual-band clients to use frequency bands with more capacity.
Your performance analysis shows that many dual-band VoWiFi client devices will move back and forth
between 2.4 and 5 GHz as the users roam throughout the building. All APs have 2.4 and 5 GHz radios
enabled with transmit power adjusted to accommodate relatively similar cell sizes.
This “band hopping” behavior is viewed by network staff to be undesirable. What is the most likely cause of
the unpredictable client band selection behavior?

What problems may occur when there are hidden nodes in the BSS?

You have been sent as a consultant to a customer site that is experiencing problems with some 2.4 GHz
clients on their 802.11a/g/n/ac network. After collecting information from the company about the problem,
your initial troubleshooting step is to find a client device experiencing performance problems and observe
its 802.11 frame exchanges in a protocol analyzer. The retransmission rate for that client is 65% instead of
the company’s baseline, which is 9%.
Based on this information, what troubleshooting step should follow to isolate the problem?

Why is it recommended for a wireless network administrator to disable 1 Mbps and 2 Mbps data rates on
the WLAN infrastructure? (Choose 2)

What type of device often causes interference across 50% or more of the 2.4 GHz frequency band?

Two co-located 802.11b/g/n APs can interfere with one another and cause contention and collisions, even
when the two APs are operating on non-overlapping channels (e.g. 1 & 6).
What deployment flaw could cause this problem? (Choose 2)

If an 802.11 RF transmission reaches a receiving antenna simultaneously by direct and reflected paths,
what effect will the reflected signal have on the signal that took the direct line-of-sight path?

What causes of hidden nodes within a BSS would be more likely lead to an increase in collisions and
retries? (Choose 2)

For what likely reasons might an organization choose to purchase an AP designed for outdoor deployment
to use as an indoor WLAN AP at an industrial facility? (Choose 2)

ABC Hospital is planning a Wi-Fi infrastructure upgrade where the 802.11b/g APs (HR/DSSS and ERP)
would be replaced with new dual-radio 802.11n/802.11ac (HT and VHT) APs. ABC wants to minimize the
time and cost associated with performing a new site survey, so they will be mounting all of the new APs in
the same locations and with the same cable drops as the existing APs.

What is one performance drawback with this deployment method?