CWT WLAN Installation & Configuration 2 — Questions and Answers
Question 1: When mounting an indoor access point on a ceiling, what is the recommended minimum clearance from metal HVAC ducts?
- 1 foot
- 3 feet (Correct answer)
- 6 feet
- 10 feet
Correct answer: 3 feet
A minimum of 3 feet clearance from metal HVAC ducts is recommended to avoid RF interference and signal reflection.
Question 2: Which 802.11 amendment introduced MU-MIMO for both uplink and downlink?
- 802.11ac Wave 2
- 802.11n
- 802.11ax (Correct answer)
- 802.11ac Wave 1
Correct answer: 802.11ax
802.11ax (Wi-Fi 6) introduced uplink and downlink MU-MIMO, whereas 802.11ac supported only downlink MU-MIMO.
Question 3: A technician needs to connect an AP to a switch port that carries multiple VLANs. What switch port mode should be configured?
- Access mode
- Trunk mode (Correct answer)
- Monitor mode
- Routed mode
Correct answer: Trunk mode
Trunk mode allows the switch port to carry tagged traffic for multiple VLANs, which the AP uses for multiple SSIDs.
Question 4: What is the purpose of configuring a management VLAN on an access point?
- To broadcast SSID beacons
- To isolate management traffic from user data traffic (Correct answer)
- To increase radio transmit power
- To enable roaming between APs
Correct answer: To isolate management traffic from user data traffic
A management VLAN isolates AP configuration and control traffic from client data traffic for security and stability.
Question 5: During a WLAN site survey, a technician notices the received signal strength drops from -65 dBm to -80 dBm over a short distance. What is the most likely cause?
- Antenna polarization mismatch
- An obstruction such as a wall or door (Correct answer)
- Too high a data rate
- Incorrect SSID configuration
Correct answer: An obstruction such as a wall or door
A sudden drop in RSSI over a short distance typically indicates a physical obstruction absorbing or reflecting RF energy.
Question 6: Which encryption protocol replaced TKIP in WPA2 to provide stronger data protection?
- WEP
- CCMP/AES (Correct answer)
- RC4
- DES
Correct answer: CCMP/AES
WPA2 uses CCMP (Counter Mode with Cipher Block Chaining Message Authentication Code Protocol) based on AES, replacing the weaker TKIP.
Question 7: An AP is configured to use 40 MHz channel bonding on the 2.4 GHz band. What is the primary drawback of this configuration?
- Lower data throughput
- Increased co-channel interference with neighboring networks (Correct answer)
- Inability to support 802.11n clients
- Reduced transmit power output
Correct answer: Increased co-channel interference with neighboring networks
The 2.4 GHz band has only three non-overlapping 20 MHz channels, so 40 MHz bonding causes significant overlap and co-channel interference.
CWT WLAN Installation & Configuration 2
When mounting an indoor access point on a ceiling, what is the recommended minimum clearance from metal HVAC ducts?