A network engineer observes a spike in controller CPU overhead and overall network utilization after multicast is enabled on a controller with 500 APs. Which feature corrects the issue?
With multicast -unicast, the wlc would have to make a copy for every packet before sending it to an AP. WIth lots of AP, that would give a nice spike in cpu.
By enabling multicast-multcast, now the wlc sends only 1 copy to a unique choosen multicast address and all APs joining that multicast address receive the packet.
Unicast mode (D) sends individual copies of multicast packets to each AP.
This increases CPU load on the WLC, as it must handle 500 separate unicast transmissions instead of one efficient multicast stream.
Unicast is only useful when the network does not support multicast.
Key Takeaways:
✔ Multicast mode should be used if the network supports it, as it reduces CPU load and network overhead.
✔ Unicast mode should only be used if multicast is not supported on the network.
✔ Multicast AP Multicast Mode is the best choice in this scenario.
Multicast mode - In this mode, the controller sends multicast packets to a CAPWAP multicast group. This method reduces overhead on the controller processor and shifts the work of packet replication to your network, which is much more efficient than the unicast method.
When you use a different VLAN/Subnet for AP and WLC, Multicast routing is mandatory on the wired side to support forwarding the downlink CAPWAP Multicast packet from WLC to AP.
D is a correct one
unicast AP multicast mode
To correct this issue, the engineer should enable the "Unicast AP Multicast Mode" feature. This feature allows multicast traffic to be converted to unicast traffic and forwarded only to the APs that have clients that are interested in the multicast stream, instead of flooding the multicast traffic to all APs. This helps to reduce network congestion and improve overall network performance.
Enabling "Multicast AP Multicast Mode" on the other hand, will cause the multicast traffic to be sent to all APs, increasing the network utilization and causing the controller CPU overhead to spike. This mode is not recommended in large wireless networks with many APs.
No B is correct
In Multicast-Unicast mode, each multicast packet is converted into a unicast packet and flooded to all the APs registered on that controller. Hence it is more CPU intensive and adds overhead on the controller.
upvoted 3 times
...
...
This section is not available anymore. Please use the main Exam Page.300-430 Exam Questions
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
Citizenx
Highly Voted 2 years agorrahim
Most Recent 2 months, 1 week agoDiegoECUIO
5 months, 3 weeks agoVlad_Is_Love_ua
1 year agoJimDiGriz
1 year, 1 month agoPawnstar
2 years, 6 months agokthekillerc
2 years, 7 months agoPawnstar
2 years, 7 months agoFortinet
2 years, 8 months agoCyrillka
2 years, 7 months ago