From the course: CompTIA Network+ (N10-009) Cert Prep

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Port mirroring

Port mirroring

From the course: CompTIA Network+ (N10-009) Cert Prep

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Port mirroring

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- I've got a little problem with my old Cisco 3550 switch here. Well, you see the problem's not really with the switch. The problem is one of the devices that I have plugged into it. It's giving me a lot of weird information. It's running hard. I'm nervous that things are coming in and out of that device that I don't want to see. Now, I could go to that device and do all kinds of things, but it's a busy computer. So what I want to be able to do is monitor all the IP traffic coming in and out of this device, and I want to do it remotely. Now, normally with a switch, you can't do that. I mean, the beauty of a switch is that it's a point to point connection. So I can't sniff the traffic going in and out of one port from a different port. Well, with a good managed switch, you can, and we call this port mirroring. What we're going to do here is we're going to configure this switch to say, "Listen, I want you to listen in on the port that that bad computer's plugged into, and I want you to…

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