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Physical, Data link and Network layers make the Network Support layers.
Open Systems Interconnection (OSI) model is the one which divides network communication process in to seven layers....
John Patterson knows
physical & data link layers
the network administrator uses the OSI model to troubleshoot network problem by verifying functionality of each layer, in many cases, troubleshooting the network problem requires the network administrator to isolate at what layer the network problem occurs. network administrators often describe networking problems by layer number, for example, a physical link problem is described as a layer 1 problem; a router problem is a layer 3.
Network layer
Network Layer
The OSI Model has 7 layers. Application Presentation Session Transport Network Data Link Physical
Transport layer and Network layer.
The OSI model is a simple framework for categorizing the different layers that make up network communication. There is no direct relation between the OSI model and any network address or protocol. In fact, most network protocols don't fit neatly in to the OSI model. TCP/IP, for example, spans the data-link, network, and transport layers.
Session, transport and network
ping checks the physical -> data -> network layers. It uses ICMP