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قديم 12-30-2013, 05:15 PM   #2
YSY
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تاريخ التسجيل: Dec 2012
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افتراضي Re: الطبقات السبعة و مهندس الشبكات

يعطيك العافية

Network Layer

Moving up from the data link layer, which sends frames over a network, we reach the network layer. The network layer deals with data packets, rather than frames, and introduces several important concepts, such as the network address and routing. Packets are sent across the network,
and in the case of the Internet, all around the world. Unless traveling to a node in an adjacent network where there is only one choice, these packets will often take alternative routes (the route is determined by routers). Communication at this level is still very low-level; network
programmers are rarely required to write software services for this layer
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