Scenario: A Citrix ADC receives packets that are destined for a service IP address owned by the Citrix ADC. The destination MAC address is NOT owned by the Citrix ADC. Layer 2 Mode is enabled on the…

Question

Options

• ADrop the packets.
• BRoute the packets.
• CBridge the packets.
• DProcess the packets.

• A
  11% (3)
• B
  4% (1)
• C
  78% (21)
• D
  7% (2)

Explanation

C is correct because when Layer 2 Mode is enabled on a Citrix ADC, the ADC uses the destination MAC address - not the destination IP - to determine packet handling. Since the destination MAC does not belong to the ADC, L2 Mode instructs it to act as a transparent bridge and forward the frame as-is, even though the destination IP is a locally owned service address.

A (Drop) is wrong because L2 Mode exists precisely to prevent the ADC from discarding such packets - without L2 Mode, dropping could occur, but enabling L2 Mode changes that behavior. B (Route) is wrong because routing involves making an IP-layer forwarding decision, which is not what happens here; the ADC is acting at Layer 2 and forwarding the frame transparently. D (Process) is wrong because the ADC would normally process packets where both the destination IP and MAC match its own - the mismatched MAC overrides that behavior when L2 Mode is active.

Memory tip: Think of L2 Mode as "MAC wins." When L2 Mode is on, the ADC checks the MAC first - if the MAC isn't mine, I bridge it; if the MAC is mine, I process it - regardless of what the destination IP says.

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