In an SDX with eight NetScaler instances, what upgrading flexibility exists for upgrading firmware across the instances?

• A. The NetScaler instance can be upgraded at the SDX management level, allowing all instances to be upgraded at once.
• B. It is NOT possible to upgrade the NetScaler instances to different firmware versions.
• C. The NetScaler instance can be upgraded on an individual basis, allowing all instances to run different firmware versions.
• D. The NetScaler instances have to be upgraded at the same time.

Answer: (C)

NetScaler SDX hosts eight VPX instances as isolated virtual appliances, each with its own firmware image. Because each instance is independent, you can upgrade them one by one and assign different firmware versions to different VPXs. This per-instance upgrade capability gives you the flexibility to test new firmware on one or a subset of instances, perform gradual rollouts, or keep others on a stable version for compatibility. In short, you’re not locked into upgrading all instances at once; you can run different firmware versions across the eight instances as needed.