Which requirement must be met to run IPv4 and IPv6 on the same Expressway traversal pair?

Question

Options

• AExpressways must have dual-stack mode disabled.
• BExpressways must run in dual-stack mode.
• CExpressways must be configured with IPv6 addresses.
• DThat is not a supported scenario.

• A
  2% (1)
• B
  90% (56)
• C
  6% (4)
• D
  2% (1)

Explanation

To support both IPv4 and IPv6 simultaneously on a Cisco Expressway traversal pair (Expressway-C and Expressway-E), both servers must be configured in dual-stack mode. Dual-stack mode enables an Expressway to bind to and process traffic on both IPv4 and IPv6 addresses concurrently, allowing it to interwork calls and signaling across both protocol families. Option A is the opposite of what is needed - disabling dual-stack would restrict the server to a single IP protocol. Option C alone (configuring IPv6 addresses) is insufficient without enabling dual-stack mode in the system settings. Option D is incorrect because this is a fully supported and documented deployment scenario when dual-stack mode is properly enabled.

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