2V0-41.24 Question 87
Single answerIn a VMware NSX-T Data Center environment, how is ARP suppression achieved to reduce broadcast traffic within a logical switch?
- A
By caching ARP entries in the Tier-1 Gateway and responding to ARP requests on behalf of VMs
- B
By using a Distributed Firewall to block all ARP traffic between VMs on the same logical switch
- C
By maintaining an ARP table in the NSX Controller and responding to ARP requests based on this table
- D
By maintaining the ARP table at the VTEPs and responding to ARP requests locally without broadcasting
Show answer and explanation
Correct answer: C
Explanation
In VMware NSX-T, ARP suppression is achieved by the NSX Controller maintaining an ARP table with MAC-to-IP mappings for VMs connected to a logical switch. When a VM sends an ARP request, the information is provided to the VM without broadcasting the request to all other VMs in the segment. This reduces unnecessary broadcast traffic and improves overall network efficiency.
- A. Incorrect.
Caching ARP entries in the Tier-1 Gateway is incorrect because ARP suppression is handled at the logical switch level, not the gateway level.
- B. Incorrect.
Using a Distributed Firewall to block ARP traffic is incorrect because it would prevent VMs from communicating and does not align with how ARP suppression works in NSX-T.
- C. Correct.
Maintaining an ARP table in the NSX Controller is correct because the controller keeps track of MAC-to-IP mappings and provides this information to suppress ARP broadcasts.
- D. Incorrect.
Maintaining the ARP table at the VTEPs is incorrect because ARP suppression is not performed by VTEPs directly but rather by the NSX Controller distributing ARP information to relevant transport nodes.