Which mode does a Citrix Administrator need to configure to allow a Citrix ADC to control the packet-forwarding function based on the route table lookups?

Question

Options

• ALayer 3
• BMBF
• CUSIP
• DLayer 2

• A
  88% (22)
• C
  4% (1)
• D
  8% (2)

Explanation

Layer 3 mode enables the Citrix ADC to operate as a full IP router, forwarding packets based on destination IP address lookups against its routing table - exactly what the question describes. Layer 2 mode (D) is wrong because it forwards at the MAC/data-link layer using MAC address tables, with no route table involvement. MBF - MAC-Based Forwarding (B) is a response-path optimization that uses the client's incoming MAC address to route replies back, bypassing the route table rather than using it. USIP - Use Source IP (C) is about preserving the original client source IP when proxying to backend servers, which is a server-side transparency feature unrelated to route table lookups.

Memory tip: Match the OSI layer to the function - Layer 3 = Network layer = IP addresses = routing tables. Whenever a question mentions "route table lookups" or "IP-based forwarding decisions," think Layer 3.

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