[2024年11月16日] ANVEのPDFで最近更新された問題です集試験点数を伸ばそう
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質問 # 156
Which network features are usually combined to prevent access to the surveillance network?
- A. Router port forwarding and VLANs
- B. IEEE 802.3ad link aggregation and HTTPS encryption
- C. Router port forwarding and IP subnets
- D. IP subnets and VLANs
正解：D
質問 # 157
The capability to view and record up to four different areas of the whole image of an AXIS P1346 is called
- A. Multi-view streaming.
- B. Broadcast streaming.
- C. Multi-link streaming.
- D. Multicast streaming.
正解：A
解説：
The capability to view and record up to four different areas of the whole image of an AXIS P1346 camera is called Multi-view streaming. This feature allows multiple cropped views to be created from a single high-resolution video stream, enabling more efficient use of bandwidth and storage while focusing on specific areas of interest within the full image. For more information, refer to the Axis Communications product documentation and technical notes on Multi-view streaming capabilities.
質問 # 158
Video motion detection (VMD) in a PTZ camera
- A. Can be used since the camera is aborting the VMD during movement.
- B. Can be used but only when the camera is used as a stationary camera.
- C. Is no different compared to a fix camera, since the Axis chip can detect in three dimensions.
- D. Is not possible since the camera will activate the VMD every time it is moving.
正解：B
解説：
Video motion detection (VMD) in PTZ (Pan-Tilt-Zoom) cameras is feasible but primarily when the camera is used as a stationary camera. PTZ cameras can activate motion detection when they are not moving, as movement of the camera itself would otherwise trigger the VMD. When the camera is stationary, it can effectively detect motion within its field of view similar to a fixed camera. Therefore, option B is correct. For more detailed information, refer to Axis Communications' guidelines on VMD functionality in PTZ cameras.
質問 # 159
The purpose of DHCP is to
- A. Allocate IP addresses to devices within a network.
- B. Allocate MAC addresses to devices within a network.
- C. Translate host names such as www.axis.com to MAC addresses.
- D. Translate host names such as www.axis.com to IP addresses.
正解：A
質問 # 160
When dealing with a poorly lit scene, which of the following options would most improve image quality?
- A. Adjusting exposure settings
- B. Adjusting brightness
- C. Changing camera placement
- D. Adding light
正解：D
解説：
When dealing with a poorly lit scene, adding light is the most effective option to improve image quality.
Proper illumination ensures that the camera's sensor can capture clear and detailed images, reducing noise and enhancing visibility. While adjusting exposure settings, brightness, or changing camera placement can help, they are secondary to the fundamental requirement of adequate lighting.
Reference: Axis Communications, "Improving Image Quality in Low Light Conditions", Application Note.
質問 # 161
What direction of movement (relative to the camera) do video analytics applications detect more easily?
- A. At a 45°angle to the camera
- B. Perpendicular to the camera
- C. Toward the camera
- D. Away from the camera
正解：B
解説：
Video analytics applications detect movement perpendicular to the camera more easily than movement toward or away from the camera. This is because objects moving perpendicular to the camera create more significant changes in the pixel patterns, making it easier for the analytics software to detect and analyze the movement.
Movement toward or away from the camera results in smaller changes in pixel patterns, which can be harder to detect accurately. References: Axis Communications documentation on video analytics and movement detection.
質問 # 162
Using AXIS Camera Management, which of the following can be performed? (Choose two)
- A. Configure crossline detection
- B. Set motion detection windows
- C. Upgrade firmware
- D. Apply templates to devices
- E. View recorded video
正解：C、D
質問 # 163
What is the maximum distance from a midspan to a camera requiring PoE+ (25.5 W)?
- A. 400 m (1312 ft)
- B. 300 m (984 ft)
- C. 200 m (656 ft)
- D. 100 m (328 ft)
正解：D
解説：
The maximum distance from a midspan to a camera requiring PoE+ (25.5 W) is 100 meters (328 feet). This distance limitation is due to the standard Ethernet cable length limit, ensuring effective power delivery and data transmission over the network.
Reference: Axis Communications. "PoE+ distance limitations and solutions." Axis PoE+ Distance.
質問 # 164
How does Zipstream's Dynamic GOP conserve bandwidth and storage?
- A. It skips new P-frames if the scene is unchanged
- B. It increases compression if the scene is unchanged
- C. It lowers the framerate if the scene is unchanged
- D. It skips new l-frames if the scene is unchanged
正解：D
解説：
Zipstream's Dynamic GOP (Group of Pictures) conserves bandwidth and storage by skipping new I-frames if the scene is unchanged. I-frames (intra-coded frames) are larger than P-frames (predictive frames) and B-frames (bi-directional frames) because they contain the full image data. By reducing the frequency of I-frames when there is no motion or change in the scene, Zipstream significantly lowers the data rate without compromising image quality. Axis documentation explains how Zipstream's Dynamic GOP feature optimizes video encoding to conserve resources effectively.
質問 # 165
What is the most effective way to improve the image quality in this scene?
- A. Decrease shutter speed
- B. Add lighting
- C. Adjust white balance
- D. Reduce gain
正解：B
解説：
The most effective way to improve the image quality in the provided scene is to add lighting. The image appears to be very dark and grainy, which is a typical result of low light conditions. Adding additional lighting will significantly enhance the camera's ability to capture clearer and more detailed images. This solution is supported by Axis Communications' documentation on optimizing image quality, which highlights the importance of adequate lighting in achieving optimal camera performance.
質問 # 166
Which one of the following camera parameters may become a limiting factor for the camera in delivering full frame rate?
- A. Flicker-free mode
- B. Aspect ratio 16:9
- C. Noise reduction
- D. Exposure time
正解：D
質問 # 167
A customer has strict requirements of 30 fps for recorded video. Which encoder choice would they select if they wanted three streams, per every one encoded channel, of D1 resolution video run at 30 fps in H.264?
- A. AXISQ7406
- B. AXISP7214
- C. AXISM7210
- D. AXISP7210
正解：B
解説：
The AXISP7214 encoder is designed to support multiple video streams per channel and is capable of delivering high frame rates and resolutions, such as D1 resolution at 30 fps in H.264 format. This encoder can handle the strict requirements of delivering 30 fps for recorded video while managing three streams per channel. Axis Network Video documentation specifies that the AXISP7214 is optimized for high-performance video encoding, making it suitable for applications demanding multiple streams and high frame rates.
質問 # 168
When using HTTPS on Axis products, true security is implemented after the
- A. Signed certificate is installed.
- B. MAC address filtering is activated.
- C. 64 character password is in place.
- D. 256 character password is in place.
正解：A
質問 # 169
In a dark indoor environment one single Axis illuminator is available. At a distance of 1 m (3 ft 3 in) away from the illuminator the light intensity is 1024 lux. At what distance from the light source will the light intensity be 256 lux?
- A. 16 m (52 ft 6 in)
- B. 8 m (26 ft 3 in)
- C. 4m{13 ft 1 in)
- D. 2 m (6 ft 7 in)
正解：D
質問 # 170
When using the view area functionality, each view area has its own video stream and (Choose two)
- A. Compression algorithm setting
- B. PTZ setting
- C. User credentials
- D. Text overlay setting
- E. Exposure control setting
正解：D、E
解説：
When using the view area functionality in Axis cameras, each view area can have its own independent video stream. Additionally, each view area can have its own exposure control setting and text overlay setting. This allows for customized video streams with different exposure settings tailored to specific areas within the camera's field of view, as well as unique text overlays for each view area, providing flexibility in video management and presentation.
質問 # 171
If an installer wants to configure 20 cameras to show the same synchronized date and time in Live View, how can this be achieved?
- A. Synchronize the date and time with a remote FTP server by downloading files from the server
- B. Synchronize the date and time with a remote NTP server
- C. Fetch the date and time from the installed root certificate
- D. Adapt the date and time from a client computer when using the camera configuration tool
正解：B
解説：
To ensure that 20 cameras show the same synchronized date and time in Live View, the best method is to synchronize the date and time with a remote NTP (Network Time Protocol) server. NTP servers are designed to synchronize clocks of network devices, ensuring accurate and consistent timekeeping across all connected devices. This method is reliable and commonly used in networked environments to maintain time synchronization across multiple devices.
References: Axis Communications Network Video Product Manual - Time and Date Settings.
質問 # 172
In an Ethernet network, broadcast traffic is received and processed by
- A. All devices on the network, making it unsuitable for network video since the network load would be unacceptable.
- B. All devices on the network, making it suitable for network video since any device can access the video without any overhead from establishing a separate connection to the server.
- C. Only those devices that have registered with the server to receive the traffic, making it suitable for network video since the network load would be kept reasonable.
- D. Only those devices that have registered with the server to receive the traffic, making it unsuitable for network video, due to the overhead from establishing a separate connection to the server.
正解：A
解説：
In an Ethernet network, broadcast traffic is sent to all devices within the network segment. This means every device receives and processes the broadcast packets, which can lead to high network load and congestion, making it inefficient for applications like network video where large amounts of data need to be transmitted reliably and efficiently. Axis documentation advises against relying on broadcast traffic for video streams, as it can degrade network performance and the quality of the video feed due to the excessive load on the network.
質問 # 173
Which of the following general statements about illumination needs of PTZ cameras is true?
- A. The f-stop value of a lens will get higher if you zoom in
- B. PTZ should not be used with IR light
- C. PTZ cameras should not be used with mixed IR and white light
- D. PTZ cameras in general tend to have lower f-stop value compared to fixed cameras
正解：A
解説：
The f-stop value of a lens will get higher if you zoom in. This is true because as the focal length increases (when zooming in), the lens aperture typically becomes smaller, resulting in a higher f-stop value. This change affects the amount of light entering the camera, which is an important consideration for PTZ (Pan-Tilt-Zoom) cameras when they are used in varying lighting conditions.
質問 # 174
Which of the following are outdoor rated products? (Choose two)
- A. AXIS P1344-E
- B. AXIS P3344-VE
- C. AXIS P3304-VR
- D. AXIS M3114-R
- E. AXIS M1031-W
正解：A、B
質問 # 175
When zooming in on an object with varifocal or zoom lens, light sensitivity of the camera is
- A. the same
- B. decreasing
- C. increasing
- D. dependent on lens
正解：B
解説：
When zooming in on an object with a varifocal or zoom lens, the light sensitivity of the camera generally decreases. This is because zooming in reduces the amount of light reaching the sensor due to the longer focal length and narrower aperture, which can result in a darker image. This effect is more pronounced in cameras with lower-quality lenses or insufficient lighting. Axis Network Video documentation explains how lens properties and zoom settings can impact light sensitivity and overall image quality.
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質問 # 176
While setting up an AXIS Q7404 Video Encoder for control of an analog PTZ using Pelco D protocol, you run into a problem. After uploading of the proper Pelco drivers into the AXIS Q7404 Video Encoder you find that channel 1 is controlling the wrong analog PTZ. Which option below would you adjust to fix this problem so you can avoid changing physical cables?
- A. Device type
- B. Device ID
- C. Baud rate
- D. IP address
正解：B
解説：
When controlling an analog PTZ camera using the Pelco D protocol, the Device ID (sometimes referred to as the address or camera ID) is crucial for ensuring that the correct commands are sent to the intended camera. If channel 1 is controlling the wrong analog PTZ camera, adjusting the Device ID will correct this without the need to change physical cables. Each PTZ camera must have a unique Device ID to ensure proper control within the system. Axis Network Video documentation details the setup and configuration of PTZ control protocols, including the importance of correctly assigning Device IDs.
質問 # 177
Axis cameras support the ONVIF and VAPIX APIs. Which of the following is true?
- A. The VAPIX API is Axis' own API which supports the latest Axis camera capabilities
- B. The ONVIF API is used to manage video configuration, while VAPIX used for audio setup
- C. The ONVIF API is Axis' own API which supports the latest Axis camera capabilities
- D. The VAPIX API is used to manage video configuration, while ONVIF is used for audio setup
正解：A
解説：
VAPIX is Axis' proprietary API (Application Programming Interface) that enables integration and management of Axis network video products. It allows developers to access a wide range of functionalities, such as video streaming, event management, and configuration settings, specifically tailored to leverage the latest capabilities of Axis cameras. ONVIF (Open Network Video Interface Forum) is an industry standard that facilitates interoperability between IP-based security products regardless of manufacturer, supporting basic functionalities for video and audio streaming, PTZ control, and event handling but not exclusively tailored to the latest Axis camera features.
質問 # 178
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