Most routers and switches used in an enterprise network offer not only copper port connectivity but also dedicated ports that can be populated with different kinds of transceivers. These transceivers are usually used for fiber connectivity but there are also copper-compatible transceivers.
Fiber connections may run over very long distances and generally those particular ports are modular and require a compatible SFP (small form-factor pluggable transceiver), like the one presented in Figure 12.2 below:
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