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I heard from a Cisco Training that Cisco switches don't have a power socket. And I actually searched for Switches' images, and indeed I don't see any.

Does this mean that the switch doesn't need power? if so, how are all features powered up (for example Cisco IOS Operating System)?

enter image description here

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    there's a power socket on the back.
    – JFL
    Jun 21, 2017 at 7:16
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    They do require power, there's a socket on the backside.
    – Teun Vink ♦
    Jun 21, 2017 at 7:17
  • By power socket they might mean something else
    – john
    Jun 21, 2017 at 7:42

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A few selected switches, like this one can be powered by POE and thus don't use external power supply.

But all other switches (including the one in your photo) do require power and have a regular C14 power socket on the backside.

Many Cisco switches can be powered trough a regular C14 power socket (110 / 220V AC) as well as , for redundancy, trough a specific connector connected to a Redundant Power System

Some others have dual traditional power supply (hot plug-able)

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