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Sams Teach Yourself Network Troubleshooting in 24 Hours, Second Edition by Jonathan Feldman

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Q&A

Q1: What’s a layer 3 switch?
A1: Layer 3 refers to layer 3 of the OSI model, discussed in Hour 2. Layer 3 is the network layer. A device that forwards traffic on layer 3 is a router. Manufacturers refer to routers as layer 3 switches when they are capable of operating at wire speed. Layer 3 switch is basically a marketing term for “fast router with built-in switch ports.”
Q2: I tried to connect to my router with a serial cable. I’m pretty sure that I’m using the right cable, but every time I use my communications program, all I see is a bunch of Ç characters. Why is my device speaking French to me? Does it think I’m cute or something?
A2: Don’t worry; your device isn’t making a pass at you; it’s not even speaking French! Any time you see ...

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