Actions for Cisco 3800 Series Access Points
Question
An engineer must perform an assessment of a customer LAN for a future IEEE 802.11ac Wave 2 wireless deployment.
All access switches are Fast Ethernet- capable only, and the wired infrastructure between existing APs and access switches is based on the CAT 6A standard.
Which two actions provide maximum support of Cisco 3800 Series access points? (Choose two.)
Answers
Explanations
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A. B. C. D. E.AC.
To provide maximum support for Cisco 3800 Series access points in a future IEEE 802.11ac Wave 2 wireless deployment, there are two recommended actions:
A. Replace the existing switches with mGig switches B. Ensure that cable distances between access switches and APs are not longer than 55 meters
Explanation:
A. Replace the existing switches with mGig switches:
IEEE 802.11ac Wave 2 wireless standard supports multi-gigabit wireless speeds that require higher-capacity Ethernet connections between the access points and the switches. To support these speeds, the switches need to have Multi-Gigabit Ethernet (mGig) capabilities, which can provide speeds up to 5 Gbps over existing Cat5e or Cat6 cabling. Since the existing switches in this scenario are only Fast Ethernet-capable, they will not be able to support the higher data rates required for IEEE 802.11ac Wave 2 wireless. Therefore, replacing them with mGig switches will provide the necessary support for the Cisco 3800 Series access points.
B. Ensure that cable distances between access switches and APs are not longer than 55 meters:
Another important consideration for a wireless deployment is the distance between the access switches and the access points. The maximum cable distance for Ethernet over Cat6a cabling is 100 meters. However, to support the higher data rates required for IEEE 802.11ac Wave 2 wireless, it is recommended to keep the cable distance between access switches and APs shorter than 55 meters. This will help to ensure that the access points can receive sufficient power and data to operate at optimal performance levels.
C. Replace the existing switches with gigabit switches with 10 G uplinks:
While gigabit switches with 10 G uplinks can provide higher data rates than Fast Ethernet switches, they do not have mGig capabilities. Therefore, they may not be able to support the full data rates required for IEEE 802.11ac Wave 2 wireless. As a result, replacing the existing switches with gigabit switches with 10 G uplinks is not the recommended solution for this scenario.
D. Ensure that cable distance between access switches and APs are not longer than 100 meters:
While the maximum cable distance for Ethernet over Cat6a cabling is 100 meters, it is recommended to keep the cable distance between access switches and APs shorter than 55 meters to support the higher data rates required for IEEE 802.11ac Wave 2 wireless. Therefore, ensuring that cable distance between access switches and APs are not longer than 100 meters is not the recommended solution for this scenario.
E. Replace the existing wiring infrastructure with the CAT-7E wiring standard:
While CAT-7E cabling can provide higher data rates than Cat6a cabling, it is not necessary to replace the existing Cat6a cabling in this scenario. Cat6a cabling is already capable of supporting the higher data rates required for IEEE 802.11ac Wave 2 wireless, as long as the cable distance between access switches and APs is kept shorter than 55 meters. Therefore, replacing the existing wiring infrastructure with the CAT-7E wiring standard is not the recommended solution for this scenario.
