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It's a Layer 3 of OSI model that you and I as network admins begin to have a great deal of interaction with the network. IP runs at this layer, and since routers operate here at L3, this layer is often called "the routing layer". In a nutshell, routing is a two-question process :
- What valid paths exist from the local router to a given destination?
- What is the best path ( the "optimal path") to take to get there?
Switches operate at L2, as do bridges. Layer 3 Switches do exist, but when operating at Layer 3, they're not switching or bridging. They're routing. You don't need to know about L3 switches for the CCENT exam, but you should know they exist as they're becoming more and more popular in today's networks.
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It's a Layer 3 of OSI model that you and I as network admins begin to have a great deal of interaction with the network. IP runs at this layer, and since routers operate here at L3, this layer is often called "the routing layer". In a nutshell, routing is a two-question process :
- What valid paths exist from the local router to a given destination?
- What is the best path ( the "optimal path") to take to get there?
Switches operate at L2, as do bridges. Layer 3 Switches do exist, but when operating at Layer 3, they're not switching or bridging. They're routing. You don't need to know about L3 switches for the CCENT exam, but you should know they exist as they're becoming more and more popular in today's networks.
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