Case Analysis & Practical Application Flashcards

A university library has thick concrete walls between floors and reports poor inter-floor coverage. What antenna type on APs is best suited for this scenario?

Answer: Patch or ceiling-mount AP with downtilt to serve the floor below through penetration planning

Ceiling-mount APs with downward radiation patterns, properly placed and accounted for floor attenuation, provide the best per-floor coverage in multi-story concrete buildings.

A security camera system uses 802.11n at 2.4 GHz and frequently drops frames. The cameras are stationary. What change would most improve reliability?

Answer: Move cameras to a dedicated 5 GHz SSID to avoid 2.4 GHz congestion

The 2.4 GHz band is more congested with only 3 non-overlapping channels; moving stationary cameras to 5 GHz provides more channels and less interference.

A company wants employees to access internal resources via Wi-Fi while preventing access to social media. Which solution enforces this without client software?

Answer: Configure role-based access control on the wireless controller with URL filtering policies

Role-based access control on wireless controllers applies per-user or per-SSID policies including URL filtering without requiring agents on endpoints.

During a post-deployment validation walk, you notice a -80 dBm signal at a location where -65 dBm was specified. What should you check first?

Answer: Whether the AP is powered on, correctly mounted, and transmitting at the planned power level

Before investigating complex causes, verify the AP is operational, properly oriented, and transmitting at the specified Tx power matching the design.

A logistics company needs to track Wi-Fi-enabled scanners across a 500,000 sq ft warehouse. Which technique allows real-time location tracking using the existing WLAN?

Answer: Wi-Fi RSSI-based triangulation or time difference of arrival (TDoA) using multiple APs

RSSI triangulation or TDoA compares signal strength or timing from multiple APs to estimate client location without additional hardware.

A client reports that their IoT sensors connect successfully but cannot reach the internet. The AP shows they are associated and have IP addresses. What should you check?

Answer: Verify the VLAN routing configuration and firewall rules for the IoT network segment

If clients have IPs but no internet, the problem is typically L3 routing or firewall policy, not the wireless connection itself.

A financial institution requires that all wireless communications be protected against eavesdropping and that each client uses unique encryption keys. Which authentication method meets this requirement?

Answer: WPA2-Enterprise with 802.1X using per-user certificates or credentials

WPA2-Enterprise with 802.1X derives unique per-session encryption keys for each client, preventing one compromised client from decrypting another's traffic.