What is used to identify Individual NSX logical Switches?

Kavya H.Jan 30, 2026

The answer is C, a VXLAN Network Identifier, or VNI. NSX logical switches are overlay networks built on top of VXLAN, and each logical switch gets a unique VNI in the range of 5000 to 16777215, which is what the transport layer actually uses to tell one logical switch from another. Think of it like a VLAN ID but for the overlay world, it travels inside the VXLAN encapsulation header so the underlay physical network never needs to know anything about your logical topology. A VLAN ID is a physical construct tied to a port group or physical switch, and a MAC address identifies an endpoint on the switch, not the switch itself, so those options are easy eliminations once you understand how VXLAN encapsulation actually works under NSX.

Prof. SaraJan 27, 2026

I almost circled D because years of VLAN thinking has my brain hardwired to associate logical network segments with VLAN IDs, but then I remembered the NSX overlay model, where VXLAN encapsulation replaces 802.1Q tagging entirely and each logical switch gets a unique 24-bit VXLAN Network Identifier, which is exactly why the answer is C.

Fatima Z.Feb 3, 2026

I blanked for a second when I saw this one on my actual exam, then I remembered my hook: VNI stands for "Very Necessary ID," and every NSX logical switch wears its VNI like a name tag at a party, nobody gets in without it. The VXLAN Network Identifier is what uniquely tags each logical switch so traffic knows exactly which virtual network segment it belongs to, so C is your answer every single time.

Ola B.Feb 1, 2026

I spun up an NSX lab last week and kept seeing the IP Hash load balancing algorithm tied to how traffic gets distributed and tracked across the fabric, so when I look at this question I keep landing on A because that hash is what the environment actually uses to pin and identify flows on those logical switches.