CCTV CCTV Network & IP Camera Configuration 3 — Questions and Answers
Question 1: What is the purpose of MAC address filtering on a CCTV network switch?
- To allow only pre-approved devices to connect to the network (Correct answer)
- To increase video compression efficiency
- To assign dynamic IP addresses to cameras
- To extend the wireless range of cameras
Correct answer: To allow only pre-approved devices to connect to the network
MAC address filtering restricts network access to only devices whose hardware addresses are whitelisted, preventing unauthorized cameras or devices from joining the CCTV network.
Question 2: What is multicast streaming and when is it used in CCTV systems?
- Sending one video stream to multiple clients simultaneously without duplicating bandwidth (Correct answer)
- Recording video to multiple drives at once
- Streaming video in multiple resolutions
- Sending alerts to multiple email addresses
Correct answer: Sending one video stream to multiple clients simultaneously without duplicating bandwidth
Multicast allows a single camera stream to be delivered to multiple viewing stations simultaneously using one stream, conserving network bandwidth compared to multiple unicast connections.
Question 3: What cybersecurity best practice should always be applied to new IP cameras before deployment?
- Change the default username and password (Correct answer)
- Disable the camera's network interface
- Set the camera to DHCP mode
- Remove the camera's SSL certificate
Correct answer: Change the default username and password
Factory default credentials are publicly known and widely exploited, so changing them immediately during setup is the most critical step to prevent unauthorized access.
Question 4: What is the role of a managed network switch in a professional IP CCTV installation?
- To provide VLAN segmentation, QoS, and PoE management for cameras (Correct answer)
- To convert coaxial cable signals to Ethernet
- To store video recordings locally
- To generate IP addresses for all cameras
Correct answer: To provide VLAN segmentation, QoS, and PoE management for cameras
A managed switch gives installers granular control over VLANs, bandwidth prioritization, PoE power budgets, and port monitoring, which are essential for large professional CCTV deployments.
Question 5: Which H.265 advantage over H.264 is most relevant when designing storage for an IP CCTV system?
- H.265 achieves roughly 50% smaller file sizes at equivalent video quality (Correct answer)
- H.265 supports higher frame rates only
- H.265 works exclusively with wireless cameras
- H.265 eliminates the need for an NVR
Correct answer: H.265 achieves roughly 50% smaller file sizes at equivalent video quality
H.265 (HEVC) compression reduces storage requirements by approximately 50% compared to H.264 at the same resolution and quality, significantly lowering drive costs in large systems.
Question 6: What does DNS (Domain Name System) allow operators to do when setting up remote CCTV access?
- Use a memorable hostname instead of a numeric IP address to access the NVR remotely (Correct answer)
- Encrypt video data during transmission
- Assign PoE budgets to individual cameras
- Schedule automatic camera reboots
Correct answer: Use a memorable hostname instead of a numeric IP address to access the NVR remotely
DNS translates human-readable domain names (e.g., cameras.company.com) into IP addresses, making remote NVR access easier to remember and manage, especially with dynamic DNS (DDNS) for changing IPs.
CCTV CCTV Network & IP Camera Configuration 3
What is the purpose of MAC address filtering on a CCTV network switch?