According to the CompTIA Tech+ Study Guide (Exam FC0-U71, 3rd Edition, 2025):
“A crimper is used to attach modular connectors, such as RJ45 or RJ11, to network or phone cables. The crimper pushes the metal contacts into the wires, securing them in place.”
Punchdown tools, by contrast, are used for patch panels or keystone jacks, not RJ45 ends.
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