Which two considerations must be made when using Expressway media traversal? (Choose two.)

Question

Options

• AIt is possible to NAT both Expressway-E interfaces
• BThe Unified Communications traversal zone should be used for MRA
• CThe Expressway-E must be put in a firewall DMZ segment
• DExpressway Control is the traversal server installed in the DMZ
• ECisco UCM zone should be either traversal server or client

• A
  3% (1)
• B
  93% (28)
• E
  3% (1)

Explanation

Two critical design requirements apply to Expressway media traversal. First, for Mobile and Remote Access (MRA), the Unified Communications (UC) traversal zone type must be used between Expressway-C and Expressway-E-a standard traversal zone will not carry the UC-specific signaling required for Jabber and other MRA endpoints. Second, Expressway-E must be placed in a firewall DMZ segment, not directly on the internet and not on the internal network-the DMZ placement allows it to be reachable externally while being separated from internal resources. The other options are incorrect: only the external interface of Expressway-E is NATted (A is wrong); Expressway-C is the traversal CLIENT on the internal network and Expressway-E is the traversal SERVER in the DMZ, not the other way around (D is wrong); and the Cisco UCM zone uses the 'Cisco UCM' zone type, not traversal server/client (E is wrong).

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