CBT Broadcast Networking & IP Systems 2

Question 1

Which protocol is commonly used to manage multicast group membership in broadcast IP networks?

Accepted Answer

IGMP (Internet Group Management Protocol)

Answer

IGMP is used by hosts and routers to manage multicast group memberships, allowing switches to direct multicast streams only to ports with interested receivers.

Question 2

In broadcast networking, what does the term 'hitless switching' refer to?

Accepted Answer

Seamlessly switching between redundant network paths with no perceptible interruption

Answer

Hitless switching refers to automatically switching to a redundant network path or stream when the primary fails, with no perceptible interruption to the media flow.

Question 3

What is the recommended minimum network bandwidth for transporting a single 1080i/59.94 uncompressed video stream per SMPTE ST 2110-20?

Accepted Answer

Approximately 3 Gbps

Answer

An uncompressed 1080i/59.94 video stream requires approximately 1.5 Gbps for video alone, and with audio and ancillary data the total approaches 3 Gbps, typically requiring 10GbE infrastructure.

Question 4

What is the role of a grandmaster clock in a SMPTE ST 2110 broadcast facility?

Accepted Answer

It provides the master PTP reference that all other devices synchronize to

Answer

The grandmaster clock is the PTP master reference in the network; all other devices synchronize their internal clocks to it, ensuring consistent timing across the entire IP facility.

Question 5

Which standard defines the Virtual Local Area Network (VLAN) tagging commonly used to segment traffic in broadcast IP networks?

Accepted Answer

IEEE 802.1Q

Answer

IEEE 802.1Q defines VLAN tagging, which allows broadcast facilities to logically segment network traffic (e.g., separating video, audio, and control traffic) on shared physical infrastructure.

(CBT) Certified Broadcast Technician Practice Test

(CBT) Certified Broadcast Technician Practice Test

CBT Broadcast Networking & IP Systems 2