300-420 · Question #200
300-420 Question #200: Real Exam Question with Answer & Explanation
The correct answer is B: Align HSRP primary and STP root bridges and reduce ARP timers to match CAM timers on the. The default ARP table aging time is 4 hours while the CAM holds the entries for only 5 minutes. The switch sends out a frame to all forwarding ports within the respective VLAN when the destination MAC address is aged out from the CAM table. You need a CAM aging timer greater or e
Question
An engineer is designing a network for a customer running a wireless network with a common VLAN for all APs. The customer is experiencing unicast flooding in the Layer 2 network between the aggregation and access layers. The customer wants to reduce the flooding and improve convergence time. Which solution meets these requirements?
Options
- AMigrate all APs to a common Layer 2 access layer switch and run Layer 3 from the aggregation
- BAlign HSRP primary and STP root bridges and reduce ARP timers to match CAM timers on the
- CMigrate to a Layer 3 access campus design if the APs can run on separate VLANs.
- DAlign HSRP primary and STP root bridges if the APs cannot run on separate VLANs.
Explanation
The default ARP table aging time is 4 hours while the CAM holds the entries for only 5 minutes. The switch sends out a frame to all forwarding ports within the respective VLAN when the destination MAC address is aged out from the CAM table. You need a CAM aging timer greater or equal to the ARP timeout in order to prevent unicast flooding. tableissues.html#:~:text=The%20default%20ARP%20table%20aging%20time%20is%204,ARP% 20timeout%20in%20order%20to%20prevent%20unicast%20flooding.
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