[H3CSEWLAN] H3CSE WLAN Certification
Exam Preparation Guide
**Question 1.** Which modulation scheme is introduced with 802.11ac Wave 2 to increase
throughput?
A) BPSK
B) QPSK
C) 256‑QAM
D) 16‑QAM
Answer: C
Explanation: 802.11ac Wave 2 supports 256‑QAM, allowing higher data rates than the 64‑QAM
used in Wave 1.
**Question 2.** In 802.11ax (Wi‑Fi 6), what mechanism enables multiple users to share the
same sub‑carrier simultaneously?
A) OFDM
B) OFDMA
C) MIMO
D) CSMA/CA
Answer: B
Explanation: OFDMA divides a channel into resource units, permitting concurrent transmissions
from several clients.
**Question 3.** Which frame type carries timing synchronization information for all stations in
a BSS?
A) Probe Request
B) Beacon
C) Authentication
, [H3CSEWLAN] H3CSE WLAN Certification
Exam Preparation Guide
D) Disassociation
Answer: B
Explanation: Beacon frames are broadcast periodically by the AP and contain the timestamp,
SSID, and capability information.
**Question 4.** What is the primary purpose of a Probe Response frame?
A) To announce the AP’s presence to nearby clients
B) To reply to a client’s Probe Request with AP capabilities
C) To request a reassociation to another AP
D) To terminate a client session
Answer: B
Explanation: When a client sends a Probe Request, the AP answers with a Probe Response
containing its SSID, supported rates, and other parameters.
**Question 5.** Which of the following frequency bands is subject to DFS (Dynamic Frequency
Selection) requirements?
A) 2.4 GHz ISM
B) 5 GHz UNII‑1
C) 5 GHz UNII‑2/UNII‑2 Extended
D) 6 GHz
Answer: C
Explanation: DFS is mandated for 5 GHz UNII‑2 and UNII‑2 Extended channels to avoid
interfering with radar systems.
**Question 6.** In H3C wireless architecture, which component runs the Comware V7
operating system?
, [H3CSEWLAN] H3CSE WLAN Certification
Exam Preparation Guide
A) Access Point (AP)
B) Wireless LAN Controller (WLC)
C) Switch Module
D) Router Interface
Answer: B
Explanation: The H3C wireless controller (AC) uses the Comware V7 OS to manage APs and
WLAN services.
**Question 7.** What is the difference between Centralized and Distributed forwarding modes
in H3C AC architecture?
A) Centralized forwards all data through the AC; Distributed forwards data directly between APs
and clients.
B) Centralized uses Layer 3 routing; Distributed uses Layer 2 bridging.
C) Centralized requires N+1 redundancy; Distributed does not.
D) Centralized supports only 2.4 GHz; Distributed supports both bands.
Answer: A
Explanation: In Centralized mode, the AC tunnels client traffic; in Distributed mode, APs perform
local forwarding, reducing latency.
**Question 8.** Which H3C high‑availability feature provides an active‑standby controller pair
with automatic failover?
A) IRF (Intelligent Resilient Framework)
B) N+1 Redundancy
C) AC Backup
D) Virtual Router Redundancy Protocol (VRRP)
Answer: C
, [H3CSEWLAN] H3CSE WLAN Certification
Exam Preparation Guide
Explanation: AC Backup creates a primary and secondary controller; the secondary takes over if
the primary fails.
**Question 9.** How does H3C’s IRF technology enhance WLAN reliability?
A) By aggregating multiple ACs into a single logical device
B) By providing per‑AP load balancing only
C) By disabling DHCP services on backup ACs
D) By encrypting CAPWAP tunnels with AES‑256
Answer: A
Explanation: IRF merges several controllers into one virtual AC, allowing seamless resource
sharing and failover.
**Question 10.** When adding capacity to an H3C AP, which license type must be installed?
A) Feature License
B) Capacity License
C) Firmware License
D) Management License
Answer: B
Explanation: Capacity licenses unlock additional radios or user counts on H3C APs.
**Question 11.** Which encryption algorithm is mandatory for WPA2‑Enterprise?
A) TKIP
B) WEP
C) AES‑CCMP
D) RC4
Exam Preparation Guide
**Question 1.** Which modulation scheme is introduced with 802.11ac Wave 2 to increase
throughput?
A) BPSK
B) QPSK
C) 256‑QAM
D) 16‑QAM
Answer: C
Explanation: 802.11ac Wave 2 supports 256‑QAM, allowing higher data rates than the 64‑QAM
used in Wave 1.
**Question 2.** In 802.11ax (Wi‑Fi 6), what mechanism enables multiple users to share the
same sub‑carrier simultaneously?
A) OFDM
B) OFDMA
C) MIMO
D) CSMA/CA
Answer: B
Explanation: OFDMA divides a channel into resource units, permitting concurrent transmissions
from several clients.
**Question 3.** Which frame type carries timing synchronization information for all stations in
a BSS?
A) Probe Request
B) Beacon
C) Authentication
, [H3CSEWLAN] H3CSE WLAN Certification
Exam Preparation Guide
D) Disassociation
Answer: B
Explanation: Beacon frames are broadcast periodically by the AP and contain the timestamp,
SSID, and capability information.
**Question 4.** What is the primary purpose of a Probe Response frame?
A) To announce the AP’s presence to nearby clients
B) To reply to a client’s Probe Request with AP capabilities
C) To request a reassociation to another AP
D) To terminate a client session
Answer: B
Explanation: When a client sends a Probe Request, the AP answers with a Probe Response
containing its SSID, supported rates, and other parameters.
**Question 5.** Which of the following frequency bands is subject to DFS (Dynamic Frequency
Selection) requirements?
A) 2.4 GHz ISM
B) 5 GHz UNII‑1
C) 5 GHz UNII‑2/UNII‑2 Extended
D) 6 GHz
Answer: C
Explanation: DFS is mandated for 5 GHz UNII‑2 and UNII‑2 Extended channels to avoid
interfering with radar systems.
**Question 6.** In H3C wireless architecture, which component runs the Comware V7
operating system?
, [H3CSEWLAN] H3CSE WLAN Certification
Exam Preparation Guide
A) Access Point (AP)
B) Wireless LAN Controller (WLC)
C) Switch Module
D) Router Interface
Answer: B
Explanation: The H3C wireless controller (AC) uses the Comware V7 OS to manage APs and
WLAN services.
**Question 7.** What is the difference between Centralized and Distributed forwarding modes
in H3C AC architecture?
A) Centralized forwards all data through the AC; Distributed forwards data directly between APs
and clients.
B) Centralized uses Layer 3 routing; Distributed uses Layer 2 bridging.
C) Centralized requires N+1 redundancy; Distributed does not.
D) Centralized supports only 2.4 GHz; Distributed supports both bands.
Answer: A
Explanation: In Centralized mode, the AC tunnels client traffic; in Distributed mode, APs perform
local forwarding, reducing latency.
**Question 8.** Which H3C high‑availability feature provides an active‑standby controller pair
with automatic failover?
A) IRF (Intelligent Resilient Framework)
B) N+1 Redundancy
C) AC Backup
D) Virtual Router Redundancy Protocol (VRRP)
Answer: C
, [H3CSEWLAN] H3CSE WLAN Certification
Exam Preparation Guide
Explanation: AC Backup creates a primary and secondary controller; the secondary takes over if
the primary fails.
**Question 9.** How does H3C’s IRF technology enhance WLAN reliability?
A) By aggregating multiple ACs into a single logical device
B) By providing per‑AP load balancing only
C) By disabling DHCP services on backup ACs
D) By encrypting CAPWAP tunnels with AES‑256
Answer: A
Explanation: IRF merges several controllers into one virtual AC, allowing seamless resource
sharing and failover.
**Question 10.** When adding capacity to an H3C AP, which license type must be installed?
A) Feature License
B) Capacity License
C) Firmware License
D) Management License
Answer: B
Explanation: Capacity licenses unlock additional radios or user counts on H3C APs.
**Question 11.** Which encryption algorithm is mandatory for WPA2‑Enterprise?
A) TKIP
B) WEP
C) AES‑CCMP
D) RC4
