Which describes what could done on the Expressway-E to successfully route calls from Expressway-C on the internal network to the Internet?

Question

Options

• AApplication layer gateway could be enabled to bridge the media traffic.
• BA static NAT route could be added to the firewall to bridge the two networks.
• CThe Expressway-E could be enabled for Dual-NIC capability.
• DThe Expressway-E could be enabled for interworking.

• A
  7% (3)
• B
  2% (1)
• C
  91% (39)

Explanation

The Expressway-E is designed to sit in the DMZ between the internal network and the public Internet. Enabling Dual-NIC (two network interface card) capability on the Expressway-E allows it to have one interface facing inward toward the Expressway-C and the internal network, and a second interface facing outward toward the public Internet. This dual-interface architecture lets it properly bridge media and signaling between the two networks without requiring complex firewall rules or application-layer gateways. Option A (ALG) is not a supported or recommended Expressway approach - Cisco explicitly advises against ALGs with Expressway. Option B (static NAT route on the firewall) alone does not enable the Expressway-E to route calls across both networks. Option D (interworking) refers to H.323-to-SIP protocol conversion, not network routing.

No community discussion yet for this question.