How should the architect deploy the NetScaler appliances to increase site resiliency?

While GSLB provides global load balancing and site-to-site failover, configuring failover sites within the Gateway is a more specific configuration of the Gateway itself to participate in a multi-site resilient setup, which GSLB often orchestrates.

A Gateway vServer is a fundamental component for remote access but merely configuring one does not inherently provide site resiliency without additional failover configurations.

A backup vServer typically refers to a local failover mechanism for a specific virtual server, not the overarching site resiliency of NetScaler appliances across multiple sites or within a comprehensive Gateway configuration.

Configuring failover sites within the NetScaler Gateway directly enhances site resiliency by providing mechanisms for traffic to be directed to a secondary site if the primary site becomes unavailable. This feature, often leveraging Global Server Load Balancing (GSLB), ensures business continuity and disaster recovery for user access.