An administrator is troubleshooting east--west network performance between several virtual machines connected to the same logical segment. The administrator inspects the internal forwarding tables…

Question

Options

• AARP Table
• BFIP Table
• CTEP Table
• DMAC Table

• A
  6% (3)
• B
  4% (2)
• C
  8% (4)
• D
  83% (44)

Explanation

In the context of VMware Cloud Foundation (VCF) networking, understanding how an ESXi host (acting as a Transport Node) handles East-West traffic is fundamental. East-West traffic refers to communication between workloads within the same data center, often on the same logical When a Virtual Machine sends a frame to another VM on the same logical segment, the ESXi host's virtual switch must determine the "location" of the destination MAC address to perform frame forwarding. The MAC Table (also known as the Forwarding Table or L2 Table) is the primary structure used for this decision. For each logical segment, the host maintains a MAC table that maps the MAC addresses of virtual machines to their specific "locations." If the destination VM is residing on the same host, the MAC table points the frame toward a specific internal port (vUUID) associated with that VM's vNIC. If the destination VM is on a different host (in an overlay environment), the MAC table entry for that remote MAC address will point to the Tunnel End Point (TEP) IP of the remote ESXi host. While the TEP table (Option C) contains the list of known Tunnel Endpoints and the ARP table (Option A) maps IP addresses to MAC addresses, neither is the primary table used for the final frame forwarding decision. The MAC Table is the authoritative source for Layer 2 forwarding. In an NSX-managed VCF environment, these tables are dynamically populated and synchronized via the Local Control Plane (LCP), which receives updates from the Central Control Plane. This ensures that even as VMs move via vMotion, the MAC table remains updated across all transport nodes, allowing for seamless East- West connectivity without the need for traditional MAC learning (flooding) in the physical fabric.

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