A Citrix Administrator manages a Citrix SDX appliance with several instances configured. When using a shared network interface, what must the administrator do to ensure that traffic flows correctly?

Question

Options

• AEnable tagging on all interfaces.
• BEnable MAC-based forwarding (MBF) mode.
• CDisable Layer 2 mode on a Citrix ADC instance.
• DEnsure Layer 3 and Layer 2 modes are enabled.

• A
  77% (17)
• B
  5% (1)
• C
  14% (3)
• D
  5% (1)

Explanation

On a Citrix SDX appliance, when multiple ADC instances share a single physical network interface, VLAN tagging (802.1Q) must be enabled so the SDX management service can identify which traffic belongs to which instance - without tags, packets arriving on a shared NIC are indistinguishable across instances, causing traffic misrouting or drops.

Why the distractors are wrong:

• B (MBF): MAC-based forwarding addresses asymmetric routing within a single ADC instance; it does not solve the multi-instance traffic segregation problem on a shared interface.
• C (Disable L2 mode): While disabling L2 mode on instances is sometimes a best practice on SDX to prevent bridging loops, it is not the mechanism that ensures traffic flows correctly across shared interfaces.
• D (Enable both L3 and L2 modes): Enabling L2 mode on SDX instances sharing an interface can actually cause problems (broadcast storms, MAC conflicts); L3 mode is preferred, making "both enabled" incorrect guidance here.

Memory tip: Think of VLAN tags as address labels on shared mail - when multiple tenants (ADC instances) share the same mailbox slot (NIC), every piece of mail needs a label (VLAN tag) so the SDX "mail sorter" delivers it to the right tenant.

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