10 free, exam-style DOCSIS Engineering Professional (DEP) practice questions with answers and explanations. No signup required. Work through them below, then take the full free DEP practice test to study every exam domain.
A downstream 256-QAM channel shows plenty of received signal level, yet customers on it report intermittent packet loss. Which measurement is the BEST single indicator of whether the channel can reliably carry that modulation?
Correct answer: B - Modulation error ratio (MER)
In an HFC distribution line, which passive device taps off a portion of RF to feed a branch while letting most of the signal continue down the line?
Correct answer: C - A directional coupler
A DOCSIS 3.1 downstream OFDM channel is configured with 25 kHz subcarrier spacing. Which FFT size is therefore in use?
Correct answer: A - 8K FFT (4096-point)
DOCSIS 3.1 adopted a new forward error correction scheme for its OFDM and OFDMA channels, giving substantially higher coding gain than the method on legacy SC-QAM channels. Which scheme is it?
Correct answer: C - Low-density parity check (LDPC)
When a DOCSIS 3.0 or later cable modem first comes up, which MAC management message describes the MAC domain and the channels to use for bonding before the modem begins ranging?
Correct answer: D - The MDD message
Which sequence correctly orders these stages of cable modem initialization?
Correct answer: B - Ranging, then DHCP, then TFTP
A VoIP service carries constant-bit-rate traffic and needs predictable low latency. Which upstream scheduling service fits BEST by issuing fixed periodic grants without the modem sending a request each time?
Correct answer: C - Unsolicited grant service (UGS)
On a DOCSIS 3.1 OFDM channel, per-subcarrier RxMER shows a deep, narrow dip across only a small block of subcarriers while the rest of the channel is clean. This signature MOST likely indicates:
Correct answer: A - Narrowband ingress at that frequency
Channel bonding, letting a modem combine multiple channels for higher throughput, was first introduced with which DOCSIS capability?
Correct answer: B - Downstream channel bonding in DOCSIS 3.0
The Message Integrity Check (MIC) carried with a downloaded DOCSIS configuration file serves what security purpose?
Correct answer: D - It verifies the file was not altered
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