01. Residents in one wing of an apartment block report weak Wi-Fi on their older phones, which use the 2.4 GHz band only. Following the installation sheet, the technician opens the access point’s management page, raises the output power and confirms the change was saved. The complaints continue, while a laptop tested on 5 GHz in the same corridor now shows a stronger signal than before.
What most likely happened?
a) The access point capped the new level at its regulatory maximum, so nothing changed
b) The new level never applies until the radio has been rebooted
c) The phones report a cached signal reading until their adapters are restarted
d) Only the 5 GHz radio’s power was raised, leaving 2.4 GHz unchanged
02. A warehouse picker reports that their handheld works perfectly at the packing bench but gets steadily worse as they walk towards the far aisle, until it stops responding. The client’s own signal-strength display falls the whole way along the route.
Which cause does this pattern point to, and why?
a) Interference, since a nearby source would produce exactly this steady decline
b) Weak signal, since interference never changes the signal level a client reports
c) Weak signal, since the degradation tracks distance and not a particular location
d) Interference, since the far aisle is where other radio sources are usually installed
03. Staff in a primary school report that the wireless network in the staff room becomes unusable for a few minutes at a time around lunch and then recovers on its own. Signal strength stays strong throughout, and only devices using the 2.4 GHz radio are affected.
What is the most likely cause?
a) A regulatory domain mismatch on the clients that removes channels at busy times
b) A microwave oven radiating in the same band as the affected clients
c) A coverage hole created by the metal shelving along the staff room wall
d) Co-channel interference from an access point in the adjoining corridor
04. After maintenance on a hotel’s guest access point, every guest device that had previously connected now fails at the same point in the join process. A brand-new device configured from the credentials printed on the room cards joins immediately and works normally.
What does this pattern indicate?
a) The access point’s radio has failed and no longer completes the four-way handshake
b) Each guest has mistyped the passphrase, which a case-sensitive entry field makes common
c) The key configured on the access point was changed, so every stored profile now holds the old value
d) The guest devices have lost their driver during the maintenance window on the access point
05. In a sports hall, a handheld scoreboard controller drops its session every time the operator walks past the halfway line, and has to be signed in again. Newer staff tablets carried along the same route stay connected throughout. The staff SSID is configured to require a fast-roaming method.
What is the most likely explanation?
a) The roaming threshold on the controller is set too low, so fast roaming never triggers
b) The halfway line sits in a coverage hole the staff tablets bridge but the controller cannot
c) The controller prefers the wrong band and switches radios each time it crosses the hall
d) The controller cannot use the fast-roaming method the SSID requires, so every move re-authenticates
06. Residents in an apartment block report that file transfers are slow at busy times, although their devices show a strong signal and sit only a few metres from the access point. A Wi-Fi scanner run in the hallway lists several neighbouring access points using the same channel.
What best explains the reported performance?
a) The access points share airtime on that channel, so transmissions wait their turn
b) The clients have selected the wrong regulatory domain and cannot use the full channel
c) A coverage hole between the flats is forcing clients to retransmit continuously
d) The neighbouring access points use overlapping channels, so frames are corrupted in the air
07. At a branch bank, one staff laptop cannot get onto the wireless network. Its wireless adapter is missing from the operating system’s list of network interfaces and no networks are shown at all. Every other device in the branch is connected normally.
What does this point to?
a) A supplicant profile on that laptop holding the wrong credentials
b) A fault on the access point serving that part of the bank
c) A wireless interference source near where that laptop is normally used
d) A problem with the wireless adapter’s driver on that one laptop
08. During a hotel refit, an installer is about to mount access points on cable runs fed from a single PoE switch that already powers the desk telephones. The units will go above the ceilings of the guest corridors, and access will be much harder once the ceilings are closed.
Which step should the installer carry out before the units go up?
a) Confirm that the regulatory domain on each access point matches the country of installation.
b) Test that each cable run supplies power to an access point before the units go up.
c) Set each access point to its lowest output power so that less power is drawn from the switch.
d) Measure the received signal strength at each planned mounting point with a Wi-Fi scanner.
09. Battery-powered Wi-Fi environmental sensors are mounted along one wall of a factory floor. Each sensor’s status page reports a strong signal from the access point, yet the access point logs frequent retries and lost readings from those sensors while laptops associated to the same unit work normally.
Which characteristic of the sensors best explains this pattern?
a) They transmit at far lower power than the laptops on this access point
b) Their status page reports RSSI rather than an absolute measurement in dBm
c) Their firmware reports a signal strength averaged over too long a period
d) They are configured to prefer a band the access point does not support
10. A newly mounted access point in a sports hall powers up, appears in the management system and answers a ping. It advertises no SSID and no client can associate with it, although an identical unit at the other end of the hall works normally. The installer notices the new unit was configured from a template built for a survey exercise.
What should the installer check first?
a) Whether the patch lead to the unit is seated in the correct switch port
b) Whether the unit was left in a monitoring mode instead of serving clients
c) Whether the mounting bracket has left the antennas pointing into the ceiling void
d) Whether the unit’s regulatory domain matches the one on the working unit