Ensurepass

QUESTION 61

Which answer correctly completes the following sentence?

 

The WMM certification, created by the Wi-Fi Alliance, is based on the ___________ coordination function with support for ___________ QoS priority.

 

A.

Hybrid, contention-based

B.

Point, scheduled

C.

Dynamic, distributed

D.

Distributed, trigger-and-delivery

E.

Enhanced, contention-free

 

Correct Answer: A

 

 

QUESTION 62

What component of the 802.11 standard allows stations to reserve access to the RF medium for a specified period of time?

 

A.

Short guard intervals

B.

DTIM Interval

C.

Listen Interval

D.

Probe Request frames

E.

RTS or CTS frames

 

Correct Answer: E

 

 

QUESTION 63

In an 802.11n WLAN with a heterogeneous set of associated client devices including 802.11b, 11g, and 11n, what HT protection mode will the BSS use?

 

A.

Mode 0: No protection mode (Greenfield)

B.

Mode 1: Nonmember protection mode

C.

Mode 2: 20 MHz protection mode

D.

Mode 3: Non-HT mixed mode

 

Correct Answer: D

 

 

QUESTION 64

What statement about 802.11 WLAN performance is true?

 

A.

Use of larger frame sizes results in greater throughput in low interference environments.

B.

BSS support for 65 KB A-MPDUs will increase the maximum data rate available to client devices.

C.

In 802.11ac, changing the security mechanism from WPA2-Personal to WPA2-Enterprise will enable the VHT MCS rates.

D.

Compared to an Independent BSS, an Infrastructure BSS can provide almost twice the throughput between wireless nodes.

E.

Use of short guard intervals improves reliability and throughput in high multipath environments

Correct Answer: A

 

 

QUESTION 65

The 802.11 protocol specifies a fundamental channel access method that is required for all stations and is used in all IBSS and BSS networks. What is this fundamental channel access method called?

 

A.

DCF

B.

PCF

C.

HCF

D.

EDCAF

E.

HCCA

F.

PCF/CA

 

Correct Answer: A

 

 

QUESTION 66

What mechanisms are specified by the IEEE 802.11 standard to attempt to prevent multiple radios from transmitting on the RF medium at a given point in time? (Choose 3)

 

A.

Random backoff timer

B.

Clear channel assessment

C.

Network allocation vector

D.

Slot assessment value

E.

Collision detection

 

Correct Answer: ABC

 

 

QUESTION 67

The client devices that connect to your network include a mix of dual-band 802.11n and 802.11ac, single-band 802.11b/g/n, and some 802.11a/g/n. Your access points are configured with the same SSID on both the 2.4 and 5 GHz bands. The APs are also configured to prioritize client connectivity to 5 GHz. How does an AP perform band steering to encourage clients to use 5 GHz?

 

A.

When the client sends a probe request in the 2.4 GHz band, the AP may reply with information about the 5 GHz BSS.

B.

The AP may ignore the initial probe requests or 802.11 authentication requests sent in the 2.4 GHz band by dual-band clients

C.

The AP may allow an 802.11 association with the client in the 2.4 GHz band, then send unicast channel switch announcements to the client announcing the 5 GHz channel as the new channel.

D.

After receiving probe request frames from the same client in both bands, the AP may send an association request frame to the client in the 5 GHz band.

E.

The AP may allow an 802.11 association with the client in the 2.4 GHz band, then the AP may perform a transparent client handoff by transferring the client’s MAC address to the 5 GHz radio.

 

Correct Answer: B

 

 

 

QUESTION 68

What information is transmitted in the Beacon management frames of an HT access point to communicate about backward compatibility with ERP and HR/DSSS stations? (Choose 2)

 

A.

HT Protection mode

B.

Non-ERP Present field

C.

Secondary channel offset

D.

RIFS mode

E.

Power save mode of clients

 

Correct Answer: AB

 

 

QUESTION 69

What feature(s) are most likely to be supported by 802.11 enterprise-class WLAN controllers? (Choose 4)

 

A.

Link aggregation / port trunking

B.

802.1p and DSCP QoS

C.

BGP and Frame Relay

D.

Captive web portals

E.

IGMP snooping

 

Correct Answer: ABDE

 

 

QUESTION 70

ABC Company has thousands of Wi-Fi users accessing their network on a daily basis. Their WLAN consists of 700 access points, 6 WLAN controllers, and a wireless network management system. What network functions are performed by the enterprise-class WNMS? (Choose 3)

 

A.

RF pre-deployment planning and post-deployment reporting of access point locations on a floor plan

B.

Performance and security monitoring of WLAN controllers with alarms and notifications for administrative staff

C.

Radio management, fast roaming, key caching, and other centralized control plane operations

D.

Centralized bridging of guest data traffic and application of firewall and QoS policies to data

E.

Management of WLAN controller configuration and provisioning of firmware updates

F.

Generating, encrypting, and decrypting 802.11 frames and collecting RF radio data.

 

Correct Answer: ABE

 

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