Cisco Routing and Switching Notes

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Static Routing

on November 23, 2018

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Layers in Networking

Open Standard Interconnect (OSI) OSI was developed by the International Organization for Standardization (ISO) and introduced in the year 1984. It is a layered architecture (consists of seven layers) Each layer defines a set of functions which takes part in data communication. Physical Layer: This layer describes stuff like voltage levels, timing, physical data rates, physical connectors and so on. Everything you can “touch” since it‟s physical. Data Link: This layer makes sure data is formatted the correct way, takes care of error detection and makes sure data is delivered reliably. This might sound a bit vague now, for now try to remember this is where “Ethernet” lives. MAC Addresses and Ethernet frames are on the Data Link layer. Network: This layer takes care of connectivity and path selection (routing). This is where IPv4 and IPv6 live. Every network device needs a unique address on the network. Transport: The transport layer takes care of

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Static Routing

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