Ensurepass

QUESTION 41

The IEEE 802.11a/n/ac physical layer technologies utilize the 5 GHz frequency band. What is true of the channels in this frequency spectrum?

 

A.

14 channels are available worldwide.

B.

11 channels are available worldwide.

C.

Regulatory domains worldwide require DFS and TPC in all these channels.

D.

DFS may be required in some regulatory domains on some channels.

E.

802.11 channels are separated by 5 Mhz

 

Correct Answer: D

 

 

QUESTION 42

What features were introduced in the IEEE 802.11h amendment in order to uphold regulatory requirements for 5 GHz operation? (Choose 2)

 

A.

256-QAM

B.

Distributed Coordination Function (DCF)

C.

Phase Shift Keying (PSK)

D.

Transmit Power Control (TPC)

E.

Radio Resource Management (RRM)

F.

Dynamic Frequency Selection (DFS)

 

Correct Answer: DF

 

 

QUESTION 43

The OSI model is a 7-layer model for understanding the functions of a communication system. What OSI sublayers are specifically addressed by the IEEE 802.11-2012 standard? (Choose 2)

 

A.

Network

B.

PPDU

C.

PLCP

D.

MAC

E.

IP

F.

Transport

 

Correct Answer: CD

 

 

QUESTION 44

Which of the following frequency ranges are specified for use by IEEE 802.11 radios? (Choose all that apply.)

 

A.

902 – 928 MHz

B.

2.4000 ?2.4835 GHz

C.

5.15 ?5.25 GHz

D.

5.470 ?5.725 GHz

E.

5.725 ?5.875 GHz

 

Correct Answer: BCDE

 

 

QUESTION 45

Which data rate is supported by 802.11g radios that is not supported by 802.11a radios?

 

A.

9 Mbps

B.

11 Mbps

C.

12 Mbps

D.

54 Mbps

E.

65 Mbps

F.

130 Mbps

 

Correct Answer: B

 

 

QUESTION 46

A Wi-Fi Alliance interoperability certificate indicates that a device is a/b/g/n certified. It further indicates one transmit and receive spatial stream for both the 2.4 GHz and 5.0 GHz bands. It further indicates support for both WPA and WPA2 Enterprise and Personal. Finally, it indicates support for EAP-TLS, EAP-TTLS/MSCHAPv2, PEAPv0/EAP-MSCHAPv2 and PEAPv1/EAP-GTC.

Which one of the following statements is false?

 

A.

This client device supports protection mechanisms such as RTS/CTS and/or CTS-to-Self.

B.

This client device supports both TKIP and CCMP cipher suites.

C.

300 Mbps is the maximum supported data rate for this device.

D.

This client device supports the ERP, OFDM, and HT physical layer specifications.

E.

This client device supports X.509 certificates for EAP authentication.

 

Correct Answer: C

 

 

 

 

QUESTION 47

When a client moves to a new BSS within an ESS,
what steps are part of the 802.11 reassociation process? (Choose 2)

 

A.

The client station transmits a Reassociation Request frame to its current access point.

B.

The current access point informs the IP gateway of the reassociation.

C.

The current access point triggers the client’s reassociation service.

D.

The new access point transmits a Reassociation Response to the client station with a status value.

E.

The client and new access point create unicast encryption keys.

F.

The client station transmits a deauthentication frame to the current access point.

 

Correct Answer: DE

 

 

QUESTION 48

In an enterprise WLAN, what condition will prevent a dual-band VHT/HT client device from performing a fast and seamless transition (i.e. latency-sensitive applications are not disrupted) between two access points that are managed by the same WLAN controller?

 

A.

The current AP is using channel 1 and the new AP is using channel 40.

B.

The SSID of the current AP does not match the SSID of the new AP.

C.

The current AP supports only HT and the new AP is VHT capable.

D.

The access points are hiding the SSID in Beacons and Probe Response frames.

 

Correc
t Answer:
B

 

 

QUESTION 49

What statements about the SSID are true? (Choose 2)

 

A.

The SSID is a security session identifier used in RSNs.

B.

The SSID must be included in an association request frame.

C.

The SSID is an alphanumeric value assigned to device manufacturers by the IEEE.

D.

The SSID is a pseudo-random number assigned to each client by an AP.

E.

The SSID is an alphanumeric value with a maximum length of 32 octets.

F.

When configuring a new network, creating an SSID is optional.

 

Correct Answer: BE

 

 

QUESTION 50

What distinguishes an independent basic service set (IBSS) from an infrastructure basic service set (BSS)?

 

A.

An IBSS does not have a distribution system (DS), but a BSS does.

B.

An IBSS does not require beacon frames, but a BSS does.

C.

An IBSS does not support 802.11 authentication or association, but a BSS does.

D.

An IBSS does not support any 802.11ac enhancements, but a BSS does.

 

Correct Answer: A

 

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