Sticky Decision Function (SDF) is required to prevent which of the following? Assume you set up an Active-Active cluster.

Symmetric routing is the desired outcome that SDF helps maintain - it is not something SDF prevents.

SDF assigns each connection to a specific cluster member and keeps it 'sticky' to that member for the duration of the session. Without SDF, packets belonging to the same session could be routed to different cluster members in an Active-Active setup, causing state mismatches and triggering connection-level failovers that drop active sessions.

While SDF promotes routing consistency, the mechanism's specific role in Active-Active clusters is to prevent mid-session connection failovers between members, not to be labeled generically as asymmetric routing prevention.

Anti-Spoofing is a separate enforcement feature that validates packet source addresses against interface topology and has no relation to SDF's cluster session-binding function.