APS –LEVEL 01 : CCNA Course Introduction Imagine three friends : Ahmed from Algeria speak Arabic, Jose from Mexico speak Spanish, and Kashimoto from Japan who speaks Japanese...Now ask yourself : How come they are friends ? there must be a common ground...
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APS –LEVEL 01 : CCNA Course Introduction Imagine three friends : Ahmed from Algeria speak Arabic, Jose from Mexico speak Spanish, and Kashimoto from Japan who speaks Japanese...Now ask yourself : How come they are friends ? there must be a common ground between them ! and yes there is they all speak the same language : English ! and all of them apply the same rules for that language ! In the same way : routers, switches, hubs, smartphones, smart tv...etc all those devices can communicates with each others cause they "speak" the same language, and all apply the same rules too ... The OSI Model The networking industry has a standard seven-layer model for network protocol architecure called the Open Systems Interconnection (OSI) Model, this model represents an effort by ISO, an international standards organisation, to standardize the design of network protocol systems to promote interconnectivity and open access to protocol standards for software developpers. The seven layers of OSI Model
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