An engineer must extend the corporate phone system to mobile users connecting through the internet with their own devices.
One requirement is to keep that as simple as possible for end users.
Which infrastructure element achieves these goals?
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A. B. C. D.C.
The infrastructure element that achieves the goal of extending the corporate phone system to mobile users connecting through the internet with their own devices while keeping it as simple as possible for end-users is Cisco Expressway-C and Expressway-E.
Cisco Expressway-C and Expressway-E are part of the Cisco Collaboration Edge Architecture, which provides secure access to collaboration services, such as voice, video, and messaging, from anywhere, using any device.
Cisco Expressway-C is a traversal client that sits inside the corporate network and provides secure access to collaboration services for external users, such as remote and mobile workers. It acts as a proxy between the external users and the corporate Unified Communications Manager (UCM) or Session Initiation Protocol (SIP) Proxy, allowing the external users to access collaboration services without the need for a VPN connection.
Cisco Expressway-E is a traversal server that sits in the DMZ and provides secure access to collaboration services for internal users who are outside the corporate network. It acts as a bridge between the external users and the internal collaboration services, such as UCM or SIP Proxy, allowing the external users to securely access these services over the internet.
Together, Cisco Expressway-C and Expressway-E provide secure access to collaboration services for remote and mobile workers, without the need for a VPN connection. This solution simplifies the user experience, as users can use their own devices and connect to collaboration services securely over the internet, without the need for additional software or hardware.
Therefore, the correct answer is B. Cisco Expressway-C and Expressway-E.