10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CBNT exam has 50 questions and runs 3 hours.
These 10 free CBNT questions are organized by exam domain, so you can see how each part of the Certified Broadcast Networking Technologist blueprint is tested. Reveal the answer and explanation under each question.
Three studio switches form a physical triangle with RSTP enabled. Service is normal, and the third link reports an alternate port in the discarding state. The installation is intended to retain an alternate path after one link fails. How should the technologist treat that port?
Correct answer: B - Leave RSTP in control and verify takeover during an approved failover test.
An Ethernet frame arrives on port 1 of a Layer 2 switch in VLAN 20. Its source MAC is new, and its unicast destination MAC is absent from the forwarding table. The only other forwarding ports in VLAN 20 are ports 2 and 3; port 4 is an access port in VLAN 30. With unknown-unicast flooding enabled, what should the switch do?
Correct answer: A - Learn the source on port 1 and flood through ports 2 and 3.
An automation controller is configured as 10.24.6.86/26 with gateway 10.24.6.65. It must send an IPv4 packet to a playout server at 10.24.6.142. No address translation or proxy ARP is used, and the necessary neighbor entries are already cached. On the controller's first Ethernet hop, which destination pair is correct?
Correct answer: A - Destination IP 10.24.6.142; destination MAC belongs to gateway 10.24.6.65.
A new studio VLAN uses a DHCP server on another IP subnet. The server has an available address pool for the new VLAN, and routing and firewall checks are satisfactory. A capture on the studio VLAN shows DHCP Discover broadcasts, but a capture at the server shows no requests from those clients. Delivery to the remote DHCP service requires:
Correct answer: D - A DHCP relay on the studio VLAN's router interface
An encoder and decoder belong to VLAN 40 on different access switches. They can each communicate with a local VLAN 40 test host, but not with each other. The inter-switch 802.1Q trunk is up and carries only VLANs 10 and 20; both endpoints must remain in VLAN 40. Which configuration change restores the intended Layer 2 path?
Correct answer: A - Add VLAN 40 to the trunk's allowed list at both ends.
A newly terminated copper patch cord passes pin-to-pin continuity on all eight conductors but fails near-end crosstalk testing badly. At both plugs, the conductors on pins 3 and 6 come from different twisted pairs. What defect explains the apparent contradiction?
Correct answer: D - A split pair at the terminations
An optical link's acceptance record shows: Receiver operating input range: -18 to -3 dBm Calibrated power-meter reading at the receiver connector: -1 dBm Link state: up; error count increasing The measured optical level calls for which corrective step?
Correct answer: A - Fit a compatible optical attenuator to reduce receive power into the specified operating range.
At the start of an overnight archive copy, short audio dropouts appear on a shared switch uplink. The port stays at 1 Gb/s full duplex; FCS errors remain at zero, but egress-queue discards climb during traffic bursts. The archive job can tolerate a lower transfer rate, but both services must remain available. Which intervention best addresses the evidence while preserving both services?
Correct answer: C - Pace the archive transfer to leave capacity for live audio.
A playout library has a verified full backup from Sunday and verified incremental backups from Monday and Wednesday. Tuesday's incremental is unreadable and contains file changes not present in the other backups. Each incremental stores changes since the previous backup. With no other recoverable copies, what is the latest complete library state that can be guaranteed?
Correct answer: C - Monday, after restoring Sunday and then Monday
'The sender and receiver show the same NTP time, so their audio clocks must be synchronized,' says a technician investigating periodic clicks. Media packets arrive without loss or late delivery, but the receiver's buffer fill drifts and its sample clock reports free-running. The installation requires PTP. Which check most directly tests the technician's assumption?
Correct answer: B - The receiver's selected PTP reference, profile, domain, and lock status
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