CVSS Video Storage & Recording Systems Flashcards
6 cards from real CVSS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CVSS Video Storage & Recording Systems flashcards as text
What is the primary functional difference between a DVR and an NVR in a surveillance system?
Answer: DVRs process analog camera signals internally; NVRs record pre-encoded IP camera streams over a network
A DVR encodes analog video signals itself, while an NVR records digital streams already encoded by IP cameras over a network connection.
In RAID 5 storage used for video surveillance, what is the minimum number of drives required?
Answer: 3
RAID 5 requires a minimum of 3 drives to stripe data with distributed parity for fault tolerance.
A surveillance system stores video at 4 Mbps per camera. How much storage (in GB) is needed for 1 camera over 24 hours?
Answer: 43.2 GB
4 Mbps × 3600 sec/hr × 24 hr = 345,600 Mb ÷ 8 = 43,200 MB = 43.2 GB.
Which video compression standard offers the best compression efficiency (smallest file size) at equivalent quality compared to H.264?
Answer: H.265 (HEVC)
H.265/HEVC achieves approximately 50% better compression than H.264 at the same visual quality, significantly reducing storage and bandwidth requirements.
What is the purpose of 'motion-based recording' in a video management system?
Answer: Record video only when the camera detects pixel change, reducing storage consumption
Motion-based recording saves storage by writing video only during activity, significantly reducing the total data recorded versus continuous recording.
In surveillance storage planning, what does 'retention period' refer to?
Answer: The number of days recorded video is kept before being overwritten
Retention period is the number of days video is stored before the oldest recordings are overwritten or deleted to free space.