When enabling Layer 2 mode on a NetScaler SDX deployment with multiple interfaces, which configuration most effectively stabilizes interface status?

• A. Enable tagging on all interfaces
• B. Enable Layer 3 mode
• C. Disable Layer 2 mode on a NetScaler instance
• D. Enable MAC-based Forwarding mode

Answer: (A)

Enabling tagging on all interfaces addresses the way traffic is carried across multiple VLANs in a NetScaler SDX deployment. In Layer 2 mode, the appliance’s ports participate in a shared switching domain, and untagged or mis-tagged frames can cause VLAN mismatches. When every interface uses 802.1Q tagging, each frame is clearly associated with a specific VLAN, so the switch and the NetScaler agree on which traffic belongs where. This removes ambiguity, prevents untagged frames from triggering interface state changes, and keeps the physical ports’ status stable across the fabric.

Layer 3 mode would shift the role to routing between VLANs and does not fix the underlying L2 stability issue. Disabling Layer 2 mode reduces L2 participation and can worsen instability. MAC-based Forwarding changes forwarding decisions but doesn’t directly resolve the stability problems caused by untagged or mixed VLAN traffic. Tagging all interfaces directly stabilizes the interface status in a multi-VLAN Layer 2 deployment.