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CWNP Exam CWNA-109 Topic 6 Question 13 Discussion

Actual exam question for CWNP's CWNA-109 exam
Question #: 13
Topic #: 6
[All CWNA-109 Questions]

You support a WLAN using dual-band 802.11ac three stream access points. All access points have both the 2.4 GHz and 5 GHz radios enabled and use 40 MHz channels in 5 GHz and 20 MHz channels in 2.4 GHz. A manager is concerned about the fact that each access point is connected using a 1 Gbps Ethernet link. He is concerned that the Ethernet link will not be able to handle the load from the wireless radios. What do you tell him?

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Suggested Answer: D

What you should tell him is thatdue to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gbps Ethernet link. This is because the actual throughput of an 802.11 network is much lower than the theoretical data rates due to factors such as overhead, contention, interference, retransmissions, and environmental conditions. Moreover, the data rates used by devices on the network vary depending on their distance, signal quality, capabilities, and configuration. Therefore, it is unlikely that both radios of the AP will simultaneously use the maximum data rates and saturate the 1 Gbps Ethernet link. Upgrading to a 10 Gbps Ethernet link or running a second 1 Gbps Ethernet link may be unnecessary and costly. Compressing all data before transmitting it onto the Ethernet link may introduce additional overhead and latency.Reference:[CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 227; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 217.


Contribute your Thoughts:

Jillian
27 days ago
Hey, why don't we just tell the manager to install a giant hamster wheel to power the APs? That'll solve the Ethernet link issue. But seriously, I think D is the way to go here.
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Johna
3 days ago
C) His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.
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Estrella
1 months ago
C? Are you kidding me? Data compression won't help here. The AP doesn't have that kind of processing power. I'm going with D. The manager is worrying too much.
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Stevie
1 months ago
I disagree. The manager's concern is valid. Even though the theoretical throughput is lower, the real-world usage could exceed the 1 Gbps Ethernet link, especially with multiple high-bandwidth clients. I'd go with B and plan to run a second Ethernet link.
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Mitzie
3 days ago
I disagree. The manager's concern is valid. Even though the theoretical throughput is lower, the real-world usage could exceed the 1 Gbps Ethernet link, especially with multiple high-bandwidth clients. I'd go with B and plan to run a second Ethernet link.
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Leonora
5 days ago
D) Due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gpbs Ethernet link.
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Kasandra
21 days ago
B) His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.
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Jospeh
1 months ago
I think the correct answer is D. The 802.11ac access points have a combined theoretical maximum throughput of 1.3 Gbps, which is lower than the 1 Gbps Ethernet link. The dynamic rates used by the devices will ensure that the Ethernet link won't be saturated.
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Eleonora
1 months ago
But wait, maybe the AP will compress the data before sending it over the Ethernet link.
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Yuki
1 months ago
If the manager is really worried, he should just switch to wired Ethernet. No more pesky wireless problems to deal with! *chuckles*
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Portia
3 days ago
D) Due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gpbs Ethernet link.
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Bok
16 days ago
C) His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.
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Jose
1 months ago
Option C is just plain silly. Data compression won't magically make the Ethernet link handle more traffic. I think the manager is right to be concerned here.
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Linn
11 days ago
D) Due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gpbs Ethernet link.
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Ronny
12 days ago
B) His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.
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Val
18 days ago
A) His concern is valid and the company should upgrade all Ethernet links to 10 Gbps immediately.
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Kasandra
2 months ago
I agree, we should consider upgrading the Ethernet links.
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Hana
2 months ago
Upgrading to 10 Gbps Ethernet is overkill. Running a second 1 Gbps link is a more reasonable solution to handle the load from the wireless radios.
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Gilma
16 days ago
Running a second 1 Gbps link is a more reasonable solution to handle the load from the wireless radios.
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Bo
24 days ago
Upgrading to 10 Gbps Ethernet is overkill.
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Catherin
26 days ago
D) Due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gpbs Ethernet link.
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Delila
1 months ago
B) His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.
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Annabelle
2 months ago
The manager's concern seems valid, as the wireless radios could potentially saturate the 1 Gbps Ethernet link. Option D seems like the best choice, as the dynamic nature of 802.11 should prevent the radios from exceeding the bandwidth.
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Katie
1 months ago
I agree, the network operations and dynamic rates should help manage the load on the Ethernet link.
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Oneida
1 months ago
Option D seems like the best choice, as the dynamic nature of 802.11 should prevent the radios from exceeding the bandwidth.
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Ma
2 months ago
I think the manager's concern is valid.
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