CCNA study notes on Open Systems Interconnection (OSI) Model

Cisco Certified Network Associate (CCNA)

OSI Model

1.The 7 layers of OSI model are:

2. SONET defines interface standards at the physical layer of the OSI seven-layer model. The standard defines a hierarchy of interface rates that allow data streams at different rates to be multiplexed. SONET establishes Optical Carrier (OC) levels from 51.8 Mbps (OC-1) to 9.95 Gbps (OC-192).

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