Traversal Zone Configuration

D.

The correct answer is D. Cisco Expressway-C and Cisco Expressway-E platforms.

Traversal zone configuration is a feature of the Cisco Expressway platform, which allows secure communications between two separate networks. The two networks can be located in different geographical locations and can use different communication protocols.

The Cisco Expressway-C and Cisco Expressway-E platforms are used to provide secure access for remote workers, partners, and customers to an organization's collaboration infrastructure. Expressway-C is typically deployed within the enterprise network, while Expressway-E is deployed in the DMZ or outside the enterprise network.

Traversal zones are used to define the relationship between Expressway-C and Expressway-E platforms. They allow for secure communication between these two platforms and provide a way to control the types of calls that can be made between them.

Traversal zones are defined by specifying the following parameters:

1. Zone name: A unique name given to the traversal zone.
2. Neighbor zone: Specifies the traversal zone on the remote Expressway-C or Expressway-E.
3. Protocol: Specifies the protocol used for communication between the traversal zones (such as SIP or H.323).
4. Credentials: Specifies the credentials used to authenticate communication between the traversal zones.
5. Search rules: Specifies how calls are routed between the traversal zones.

In summary, the traversal zone configuration in Cisco Expressway platforms defines the secure communication between the Expressway-C and Expressway-E platforms, which are used to provide secure access to an organization's collaboration infrastructure.