CST IP Camera & PoE Networking 3

Question 1

Which H.264 profile is most commonly used in IP cameras to balance compression efficiency and hardware compatibility?

Accepted Answer

High Profile

Answer

High Profile provides the best compression efficiency and is widely supported by modern IP cameras and NVRs for surveillance applications.

Question 2

A PoE switch has a total power budget of 120W with 8 ports. All 8 cameras draw 15W each. What happens when the 8th camera is connected?

Accepted Answer

The 8th camera does not receive PoE power

Answer

When total demand (8×15W=120W) reaches the switch's power budget, the last connected device may be denied power depending on port priority settings.

Question 3

What does the term 'codec' refer to in IP camera video transmission?

Accepted Answer

The algorithm that compresses and decompresses video data

Answer

A codec (coder-decoder) is the algorithm that compresses video for transmission and decompresses it for playback, such as H.264 or H.265.

Question 4

Which IP camera resolution is referred to as '4MP'?

Accepted Answer

2688×1520 pixels

Answer

4MP typically refers to 2688×1520 resolution (approximately 4 megapixels), commonly used in surveillance cameras.

Question 5

A network switch is configured with 802.1Q VLAN tagging. What is the function of the 'native VLAN' on a trunk port?

Accepted Answer

It handles untagged frames received on that trunk port

Answer

The native VLAN on an 802.1Q trunk port carries untagged frames; any untagged traffic is assigned to the native VLAN by default.

(CST) Certified Surveillance Technician Practice Test