Exam 3V0-25.25 Topic 5 Question 18 Discussion
Actual exam question for VMware's 3V0-25.25 exam
Question #: 18
Topic #: 5
Question #: 18
Topic #: 5
In an NSX environment, an administrator is observing low throughput and intermittent congestion between the Tier-0 Gateway and the upstream physical routers. The environment was designed for high availability and load balancing, using two Edge Nodes deployed in Active/Active mode. The administrator enables ECMP on the Tier-0 gateway, but the issues persist. Which action would address low throughput and congestion?
Suggested Answer: D Vote an answer
Comprehensive and Detailed 250 to 350 words of Explanation From VMware Cloud Foundation (VCF) documents:
When aVMware Cloud Foundation (VCF)environment experiences North-South congestion at theTier-0 Gateway, it typically indicates that the processing capacity of the existingNSX Edge Nodeshas been reached.
In anActive/Activeconfiguration, the Tier-0 gateway utilizesEqual Cost Multi-Pathing (ECMP)to distribute traffic across all available Edge nodes in the cluster.
If a two-node Edge cluster is saturated despite ECMP being enabled, the standard "Scale-Out" procedure is to deploy additional Edge nodes(Option D). NSX supports up to8 Edge nodesin a single cluster for a Tier-0 gateway. By adding more nodes, the administrator increases the total number of CPU cores dedicated to the DPDK (Data Plane Development Kit) packet processing engine. Each additional node provides more
"bandwidth lanes" for the ECMP hash to utilize, effectively multiplying the aggregate throughput capability of the North-South exit point.
Option A is incorrect because "edgeless" Tier-1 gateways (Distributed Routers only) improve East-West performance by keeping traffic on the ESXi hosts, but they do not help with North-South traffic that must eventually hit a Tier-0 Service Router on an Edge. Option B (Disabling NAT) might reduce CPU overhead slightly, but it doesn't solve a fundamental capacity bottleneck and is often not an option due to architectural requirements. Option C (Adding a vNIC) does not increase the underlying compute/DPDK processing power of the Edge VM and can sometimes complicate the load-balancing hash.
In VCF operations, this expansion is handled via theSDDC Manager, which can automate the addition of new Edge nodes to an existing cluster, ensuring they are configured symmetrically with the correct uplink profiles and BGP peering sessions. This horizontal scaling is the verified method for resolving congestion in high-demand VCF networking environments.
When aVMware Cloud Foundation (VCF)environment experiences North-South congestion at theTier-0 Gateway, it typically indicates that the processing capacity of the existingNSX Edge Nodeshas been reached.
In anActive/Activeconfiguration, the Tier-0 gateway utilizesEqual Cost Multi-Pathing (ECMP)to distribute traffic across all available Edge nodes in the cluster.
If a two-node Edge cluster is saturated despite ECMP being enabled, the standard "Scale-Out" procedure is to deploy additional Edge nodes(Option D). NSX supports up to8 Edge nodesin a single cluster for a Tier-0 gateway. By adding more nodes, the administrator increases the total number of CPU cores dedicated to the DPDK (Data Plane Development Kit) packet processing engine. Each additional node provides more
"bandwidth lanes" for the ECMP hash to utilize, effectively multiplying the aggregate throughput capability of the North-South exit point.
Option A is incorrect because "edgeless" Tier-1 gateways (Distributed Routers only) improve East-West performance by keeping traffic on the ESXi hosts, but they do not help with North-South traffic that must eventually hit a Tier-0 Service Router on an Edge. Option B (Disabling NAT) might reduce CPU overhead slightly, but it doesn't solve a fundamental capacity bottleneck and is often not an option due to architectural requirements. Option C (Adding a vNIC) does not increase the underlying compute/DPDK processing power of the Edge VM and can sometimes complicate the load-balancing hash.
In VCF operations, this expansion is handled via theSDDC Manager, which can automate the addition of new Edge nodes to an existing cluster, ensuring they are configured symmetrically with the correct uplink profiles and BGP peering sessions. This horizontal scaling is the verified method for resolving congestion in high-demand VCF networking environments.
by framer.sheaves.3q at Feb 07, 2026, 07:20 AM
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framer.sheaves.3q
2026-02-07 07:20:25Upvoting 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.
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