A VPN (Virtual Private Network) creates a secure tunnel through the network where your information travels encrypted. This means that data transmitted over the VPN is protected from eavesdropping and unauthorized access. It is not specifically optimized for video data packets nor does it translate domain names to IP addresses. Therefore, the correct answer is C. For more detailed information, refer to Axis Communications' guidelines on secure remote access and VPN usage.

If a PoE (Power over Ethernet) switch is unable to supply sufficient power to a network device, a midspan, also known as a PoE injector, should be used. A midspan is an external device that adds power to the Ethernet cable, thus providing the necessary power to the network device. This is particularly useful when existing network infrastructure cannot be upgraded to meet power requirements. According to Axis documentation, midspans are recommended to ensure adequate power delivery for network devices that require PoE.

When changes made to image clarity within the camera web interface are not reflected within a Video Management Software (VMS), it is often due to the VMS having its settings and configurations that can overwrite those made directly on the camera. Many VMS solutions are designed to manage and standardize settings across multiple cameras, ensuring consistency in video quality and performance. This functionality can override local changes made on the camera interface. According to Axis Network Video documentation, this behavior is typical in integrated systems where VMS settings take precedence to maintain uniformity across all connected devices.

The Sharpdome technology allows PTZ cameras to maintain a sharp image even when pointed above the horizon. This feature uses a specialized mechanical design and advanced image processing to ensure clear, undistorted images across the entire dome, including the critical area above the horizon. Axis Communications has integrated Sharpdome technology into several of their PTZ camera models, as explained in their product specifications and technical white papers.

Axis Official Documentation Extract:
"The unique design of the Sharpdome enables an innovative viewing experience, allowing the PTZ camera to see above its own horizon, giving more usable coverage, especially on uneven terrain or in hilly cities. This capability is called Axis Sharpdome technology."
- Source: AXIS Q61 Series Sharpdome Technology
Supporting Extract from Axis Study Guide:
"Sharpdome technology allows PTZ cameras to deliver sharp images in all directions, and for the first time, the camera can view above the horizon, which is not possible with conventional dome cameras."
- Axis Communications Academy, Network Video Fundamentals, 2022
References:
Axis Sharpdome Technology Overview
Axis Communications Academy, Network Video Fundamentals, 2022 (p. 48)
Summary:
With Axis Sharpdome technology, a PTZ camera can see above its horizon, providing greater coverage and flexibility for surveillance in challenging environments. This is a unique feature not available in traditional PTZ domes.