Axis Network Video Exam Practice Test

Answer : C

The reason why the camera is not blinded by the headlights is that an IR-pass filter is in use. This filter blocks out visible light, including the bright headlights, and allows only infrared light to pass through. This is particularly useful in nighttime surveillance scenarios where the camera can rely on infrared illumination instead of visible light, ensuring clear visibility even in the presence of bright lights like headlights.

Answer : B

In good conditions, a pixel density of 250 px/m (80 px/ft) is required for identification purposes. This means that at this resolution, the image quality is sufficient to identify individuals, objects, or other details accurately. Identification requires the highest level of detail among the common surveillance objectives (detection, observation, recognition, identification). This pixel density allows for clear and precise visual information necessary for identifying specific features such as facial characteristics or license plates.

Answer : B

The primary purpose of the accessory on this dome camera is to reduce the weather impact. This accessory, often referred to as a weather shield or rain guard, helps protect the camera lens from rain, snow, and other environmental elements, ensuring clear visibility and reducing the need for maintenance. It also helps to minimize the impact of direct sunlight, reducing glare and improving image quality. Reference: Axis Dome Camera Accessories

Answer : C

When using an external IR illuminator with a beam angle significantly narrower than the field of view, the exposure may be uneven. This can result in parts of the image being overexposed (too bright) while other parts remain underexposed (too dark). Ensuring that the beam angle of the IR illuminator matches the field of view of the camera is essential for achieving uniform illumination across the entire surveillance area. Reference: Axis Communications IR Illumination Guide

Answer : C

For an outdoor school playground, the most appropriate IP rating is IP67. This rating indicates that the camera is completely protected against dust (the first digit '6') and can withstand immersion in water up to 1 meter for 30 minutes (the second digit '7'). This level of protection is ideal for outdoor environments where the camera may be exposed to dust, rain, and other environmental factors. Reference: Axis Communications Outdoor Cameras

Answer : C

A router is a device used to forward data from one Local Area Network (LAN) to another. It operates at the network layer (Layer 3) of the OSI model and uses IP addresses to determine the best path for data packets to travel between networks. Routers connect multiple networks, manage traffic, and facilitate communication between different network segments. Reference: Axis Communications network design documentation and standard networking resources.

Answer : D

A MAC (Media Access Control) address is a unique physical address assigned to network interfaces for communication on the physical network segment. It is used for direct data exchange within a network, ensuring that data packets are delivered to the correct device. Unlike IP addresses, MAC addresses operate at the data link layer (Layer 2) of the OSI model and are hard-coded into the network interface card (NIC) by the manufacturer. Reference: Axis Communications networking guides and standard networking principles.