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FC0-U71 Practice Question: A network technician is explaining to a client…
A network technician is explaining to a client why a file transfer over the network is slower than expected. Which factor MOST likely affects transfer speed?
⚠ Common exam trap
CompTIA often tests the misconception that encryption or file format directly controls transfer speed, when in fact bandwidth is the primary bottleneck in most network file transfers.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Bandwidth
Bandwidth is the maximum rate at which data can be transferred over a network path, typically measured in bits per second (bps). A lower bandwidth directly limits the throughput of a file transfer, causing it to take longer regardless of other factors. This is the most fundamental constraint on transfer speed, as it defines the pipe size through which all data must flow.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Bandwidth
Why this is correct
Bandwidth caps the maximum data volume the link can carry per second, so a transfer cannot exceed that ceiling regardless of other conditions. When bandwidth is the bottleneck, it is the factor most directly limiting the observed transfer speed.
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File compression
Why it's wrong here
Compression reduces payload size, which usually speeds transfer rather than slowing it, though it adds CPU cost. It would be the relevant factor when comparing codecs for bandwidth-constrained links, not when identifying the cause of unexpectedly slow throughput.
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File format
Why it's wrong here
File format affects application compatibility and parsing, not the rate at which bits traverse the link; bandwidth, latency and congestion govern transfer speed. Format choice would matter when selecting a codec or container for interoperability, not when diagnosing slow throughput.
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Encryption
Why it's wrong here
Encryption adds processing overhead but rarely dominates transfer time; bandwidth, latency and packet loss do. Encryption would be the deciding factor when comparing CPU-bound cryptographic throughput or meeting a confidentiality requirement, not when explaining a slow network transfer.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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