To ensure the NetScaler uses the client IP address as the source IP for connections to servers, which mode should the administrator use?

• A. USIP
• B. Layer 2 Mode
• C. USNIP
• D. Layer 3 Mode

Answer: (A)

Use Client IP (USIP) is about preserving the original source address when traffic is forwarded from the NetScaler to backend servers. Enabling USIP makes the servers see the client’s IP as the source of the connection, instead of the NetScaler’s SNIP. This is essential for accurate server logs, auditing, geolocation decisions, and any application logic that relies on the client’s address. In contrast, using the SNIP (USNIP) would substitute the client IP with the NetScaler’s IP on server requests, which defeats the goal. Layer 2 or Layer 3 modes describe how NetScaler connects to the network and do not by themselves guarantee client IP preservation; USIP is the specific setting that ensures the client’s address is used as the source.