CCTV Video Recording and Storage Questions and Answers

Question 1

A financial institution requires a video storage solution for its 64-camera system that prioritizes high data redundancy and can withstand the failure of up to two hard drives simultaneously without any data loss. Which RAID level best meets this requirement?

Accepted Answer

RAID 6

Answer

RAID 6 extends RAID 5 by adding a second, independent parity block. This dual parity allows the array to remain operational and rebuild data even if two member drives fail at the same time, making it ideal for critical applications requiring high fault tolerance.

Question 2

What is the fundamental difference in how a Digital Video Recorder (DVR) and a Network Video Recorder (NVR) handle the video encoding process?

Accepted Answer

A DVR encodes video at the recorder, while an NVR receives an already encoded stream from the IP camera.

Answer

The key distinction is where encoding occurs. In a DVR system, analog cameras send raw video signals over coaxial cable to the DVR, which then encodes the signal into a digital format for storage. In an NVR system, the IP cameras encode the video themselves and transmit a ready-to-record digital stream over the network to the NVR.

Question 3

A security manager wants to significantly increase the video retention period for a 16-camera system without purchasing additional hard drives. The monitored areas are mostly inactive overnight. Which change in recording configuration would be most effective?

Accepted Answer

Switching from continuous recording to motion-based recording.

Answer

Motion-based recording only saves video when activity is detected. For areas with long periods of inactivity, this drastically reduces the amount of data stored compared to continuous (24/7) recording, thereby extending the retention period on existing storage. The other options would all increase storage consumption.

Question 4

When configuring an IP camera for a scene with highly variable activity, such as a quiet office lobby that becomes crowded during lunch, which bitrate setting most efficiently maintains image quality while optimizing storage?

Accepted Answer

Variable Bitrate (VBR)

Answer

Variable Bitrate (VBR) allows the encoder to use a higher bitrate during complex, high-motion scenes to maintain image quality and a lower bitrate during simple, static scenes to save storage space and bandwidth. CBR uses a fixed bitrate regardless of scene complexity, which can waste space or compromise quality.

Question 5

A critical infrastructure site uses a Video Management System (VMS) with a primary recording server. To comply with regulations, video recording must continue uninterrupted even if this primary server experiences a complete hardware failure. Which feature is designed for this level of recording redundancy?

Accepted Answer

Failover Recording Server

Answer

A failover recording server is a secondary, standby server that automatically takes over recording tasks if the primary server becomes unavailable. While RAID protects against drive failure and redundant power supplies protect against a power unit failure, only a failover server can ensure recording continuity during a complete server hardware failure.

CCTV - Closed Circuit Television Practice Test

CCTV - Closed Circuit Television Practice Test

CCTV Video Recording and Storage Questions and Answers