Why is deploying two NetScaler appliances - one in the primary and one in the secondary datacenter, configured with a Gateway vServer the best design solution?

A Gateway vServer provides secure remote access, and deploying two appliances in separate datacenters enhances reliability by offering redundancy for the access point. This configuration ensures that users can establish a secure and dependable connection, ideally to their primary datacenter, facilitating continuous business operations and a robust remote work environment.

While two appliances in different datacenters can provide redundancy (especially when paired with GSLB, not mentioned here), the setup with only Gateway vServers does not inherently optimize external WAN traffic, which is a separate specialized function.

This option describes a logical separation of functions within the NetScaler, not a direct benefit of deploying two Gateway vServers across different datacenters.

While a Gateway vServer does provide SSL VPN functionality and a multi-datacenter deployment supports remote access expansion, option A focuses on the holistic end-user experience including secure, reliable access to their primary datacenter, which is often a key design driver.