CyberCertPrepNetwork FundamentalsNetwork DevicesEASYFree question
What is a network video recorder (NVR) compared to a DVR, and how do IP cameras connect to an NVR in a modern surveillance network?
- A.An NVR uses coax cabling and analog signals, while a DVR is the modern IP-based recording solution
- B.An NVR records video from IP cameras over a standard Ethernet/IP network; a DVR encodes analog CCTV camera signals via coax. IP cameras stream H.264/H.265 video using RTSP to the NVR over the network
- C.An NVR requires dedicated fiber connections to each camera; Ethernet cannot carry video at surveillance resolution
- D.DVR and NVR are interchangeable terms; the difference is only vendor preference
Why B is correct
NVR (Network Video Recorder) receives video from IP cameras over Ethernet using RTSP (Real Time Streaming Protocol, typically TCP 554) and records compressed video. DVR (Digital Video Recorder) digitizes analog CCTV signals via coax cables. Modern surveillance systems use IP cameras on standard PoE switches feeding into an NVR. Options B, C, D invert the definitions or contain false claims.
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