You have just installed an Ethernet jack in an office and need to connect it to the patch panel in the wiring closet. When you get to the wiring closet, you see that several unused cables are not identified by room number, so you can't tell which one to connect. Which tool in your networking toolkit will best help you solve this problem?

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You have just installed an Ethernet jack in an office and need to connect it to the patch panel in the wiring closet. When you get to the wiring closet, you see that several unused cables are not identified by room number, so you can't tell which one to connect. Which tool in your networking toolkit will best help you solve this problem?