Which of the following IP protocols is used in the Webex Calling environment?

In a Webex Calling environment, both IPv4 and IPv6 are utilized to ensure compatibility and support for a broader range of networking scenarios. Using both protocols allows for flexibility in addressing and allows the system to operate in various network environments, as many organizations may still rely on IPv4 while gradually transitioning to IPv6.

IPv4, which has been the dominant protocol for many years, provides approximately 4.3 billion unique addresses, sufficient for historical needs but increasingly exhausted due to the growth of devices connected to the internet. On the other hand, IPv6 was developed to address this limitation, offering a vastly larger pool of addresses and improved features, such as better security and more efficient routing.

Webex Calling's use of both protocols ensures that organizations can seamlessly integrate the service into their existing infrastructure regardless of their current IP addressing scheme, enhancing overall user adoption and connectivity. As such, the correct answer reflects the necessity of supporting both IPv4 and IPv6 in the modern telecommunications landscape.