Free HP HPE6-A85 Practice Exams - Page 5 of 6

Question #41

Which three channels can be used simultaneously in a 2.4GHz WLAN environment while avoiding any co-channel interference?

A . 1,6, 11
B . 1,5, 10
C . 3,6, 9
D . 2,7, 11

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Question #42

Refer to Exhibit.

Which server will receive the smallest quantity of data?

A . 172.17.17.43
B . 10.100.100.25
C . 10.99.26.25
D . 192.168.0.56

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Question #43

Which feature can network administrators use to centralized RF planning and optimization service when using an Aruba mobility master architecture?

A . Airwave
B . Client Match
C . AirMatch
D . Client Wave

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Question #44

What change does a client make when it roams from one access point to another in a WLAN?

A . It changes the destination MAC address on its 802.11 frames.
B . It changes the SSID to match the SSID on the new access point.
C . It changes its default gateway to the IP of the new access point.
D . It changes its association with the new wireless controller’s SSID.

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Question #45

What is the correct command to add a static route to a class-c-network 10.2.10.0 via a gateway of 172.16.1.1?

A . ip-route 10.2.10.0/24 172.16.1.1
B . ip route 10.2.10.0.255.255.255.0 172.16.1.1 description aruba
C . ip route 10.2.10.0/24.172.16.11
D . ip route-static 10.2 10.0.255.255.255.0 172.16.1.1

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Question #46

What does WPA3-Personal use as the source to generate a different Pairwise Master Key (PMK) each time a station connects to the wireless network?

A . Session-specific information (MACs and nonces)
B . Opportunistic Wireless Encryption (OWE)
C . Simultaneous Authentication of Equals (SAE)
D . Key Encryption Key (KEK)

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Question #47

DRAG DROP

Match the Aruba Central technology to the appropriate feature. (Matches may be used more than once.)

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Question #48

Which Aruba technology will allow for device-specific passphrases to securely add headless devices to the WLAN?

A . Wired Equivalent Privacy (WEP)
B . Multiple Pre-Shared Key (MPSK)
C . Opportunistic Wireless Encryption (OWE)
D . Temporal Key Integrity Protocol (TKIP)

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Question #49

What are the main characteristics of the 6 GHz band?

A . Less RF signal is absorb by objects in a 6 GHz WLAN.
B . In North America, the 6 GHz band offers more 80 MHz channels than there are 40 MHz channels in the 5 GHz band.
C . The 6 GHz band is fully backward compatible with the existing bands.
D . Low Power Devices are allowed for indoor and outdoor usage.

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Correct Answer: B
B

Explanation:

The main characteristic of the 6 GHz band that is true among the given options is that in North America, the 6 GHz band offers more 80 MHz channels than there are 40 MHz channels in the 5 GHz band. This characteristic provides more spectrum availability, less interference, and higher throughput for wireless devices that support Wi-Fi 6E Wi-Fi Enhanced (Wi-Fi 6E) is an extension of Wi-Fi 6 (802.11ax) standard that operates in the newly available unlicensed frequency spectrum around 6 GHz in addition to existing bands below it.

Some facts about this characteristic are:

– In North America, there are up to seven non-overlapping channels available in each of three channel widths (20 MHz, 40 MHz, and 80 MHz) in the entire unlicensed portion of the new spectrum (5925C7125 MHz). This means there are up to 21 non-overlapping channels available for Wi-Fi devices in total.

– In comparison, in North America, there are only nine non-overlapping channels available in each of two channel widths (20 MHz and 40 MHz) in the entire unlicensed portion of the existing spectrum below it (2400C2483 MHz and 5150C5825 MHz). This means there are only up to nine non-overlapping channels available for Wi-Fi devices in total.

– Therefore, in North America, there are more than twice as many non-overlapping channels available in each channel width in the new spectrum than in the existing spectrum below it.

– Specifically, there are more than twice as many non-overlapping channels available at 80 MHz width (seven) than at 40 MHz width (three) in the existing spectrum below it.

The other options are not true because:

– Less RF signal is absorbed by objects in a 6 GHz WLAN: This option is false because higher frequency signals tend to be more absorbed by objects than lower frequency signals due to higher attenuation Attenuation is a general term that refers to any reduction in signal strength during transmission over distance or through an object or medium. Therefore, RF signals in a 6 GHz WLAN would be more absorbed by objects than RF signals in a lower frequency WLAN.

– The 6 GHz band is fully backward compatible with existing bands: This option is false because Wi-Fi devices need to support Wi-Fi 6E standard to operate in the new spectrum around 6 GHz. Existing Wi-Fi devices that do not support Wi-Fi 6Estandard cannot use this spectrum and can only operate in existing bands below it.

– Low Power Devices are allowed for indoor and outdoor usage: This option is false because Low Power Indoor Devices (LPI) are only allowed for indoor usage under certain power limits and registration requirements. Outdoor usage of LPI devices is prohibited by regulatory authorities such as FCC Federal Communications Commission (FCC) is an independent agency of United States government that regulates communications by radio, television, wire, satellite, and cable across United States. However, outdoor usage of Very Low Power Devices (VLP) may be allowed under certain power limits and without registration requirements.

References:

https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-6e

https://www.wi-fi.org/file/wi-fi-alliance-spectrum-needs-study

https://www.cisco.com/c/en/us/products/collateral/wireless/spectrum-expert-wi-fi/prod_white_paper0900aecd80

https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/82068-power-levels.html

https://www.wi-fi.org/file/wi-fi-alliance-unlicensed-spectrum-in-the-us

Question #50

Which part of the WPA Key Hierarchy is used to encrypt and/or decrypt data”

A . Pairwise Temporal Key (PTK)
B . Pairwise Master Key (PMK)
C . Key Confirmation Key (KCK)
D . number used once (nonce)

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