Cisco media traversal technology has enabled a secure environment where internal video endpoints call and receive calls from external video endpoints. How does the Expressway-C and Expressway-E…

Question

Options

• AExpressway-C establishes an outgoing request to Expressway-E, enabling the Expressway-E
• BInternal endpoints are registered to Expressway-E in the DMZ. Expressway-C, which is also in
• CExpressway-E establishes an outgoing request to Expressway-C, enabling the Expressway-C
• DInternal endpoints are registered to Expressway-C in the DMZ. Expressway-E, which is also in

• A
  92% (34)
• C
  3% (1)
• D
  5% (2)

Explanation

Cisco Expressway uses a firewall-traversal architecture where Expressway-C (Core), located inside the enterprise network, always initiates the outbound connection to Expressway-E (Edge), located in the DMZ. This design means the internal firewall only needs to permit outbound traffic from Expressway-C to Expressway-E - no inbound holes are required through the internal firewall. Once Expressway-C establishes this persistent outbound TCP connection (the traversal zone), Expressway-E can use it bidirectionally to forward calls and media between external endpoints and internal resources. Internal endpoints register to Expressway-C (not Expressway-E), and Expressway-E never initiates connections inward.

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