HP HPE6-A85 Aruba Certified Campus Access Associate Exam Online Training

Question #41

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.

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 #42

After having configured the edge switch uplink as requested your colleague says that they have failed to ping the core You ask your colleague to verify the connection is plugged in and the switch is powered on They confirm that both are correct You attempt to ping the core switch and confirm that the ping is failing.

Knowing the nature of this deployment, what commands might you use to troubleshoot this issued

A . Ping 10.11 1 – ping the core to attempt to verify connectivity Show trunk – to verify if the LAG interface was correctly added to the switch Show spanning tree – to check for spanning-tree blocked states Show port-access clients interface all – to view any port-access blocking states or failed authentication attempts on all interfaces Show run interface vlan20 – to double check the layer 3 svi configuration is correct for l_3 connectivity Show lldp neighors – to verify whether you are able to see the Core as an L2 neighbor to verify if the correct links are plugged in to the correct ports
B . diagnostic diag cable-diag 1/1/51 diag cable-diag 1/1/52 – to view diagnostic information for the physical link to get a status on any interruptions to Layer 1 connectivity, show ip route – to verify that the default gateway is present in the routing table show ip ospf – to check whether there is a layer 3 routing protocol enabled show ip dns – to view whether there is a valid dns source
C . Ping 10.1.1.1 – ping the core to attempt to verify connectivity show lacp agg – to verify which link aggregations are currently configured using which physical ports show lacp int – to verify the LACP status and whether any links are blocking in your topology show lldp neighors – to verify whether you are able to see the Core as an L2 neighbor to verify if the correct links are plugged in to the correct ports show run interface 1/1/51.1/1/52-to ensure the physical interfaces are no-shut and members of the lag show run interface lag 1 – to ensure the correct vlan trunking configuration is applied to the logical interface show run int vlan 20 – to ensure you have the L3 SVI no shut and configured in the correct subnet
D . Show run – to view the running configuration of the switch Show run | begin 20 "vlan 20" – to ensure VLAN 20 was correctly added to the database show run | begin 20 ‘interface vlan 20’ – to view the L3 SVI configuration Show run interface 1/1/51.1/1/52 – to ensure the physical interfaces are no shut and were added as members of LAG 1 Show run int lag 1 – to verify LACP mode active was configured to eliminate LACP blocking states

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Question #43

Match the phase of message processing with the Open Systems interconnection (OSl) layer.