What Tcp/ip Model Layer Is Responsible For Mac Addressing
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What is the correct order of the layers of the TCP/IP model from the top layer to the bottom? Application, transport, internet, network access What is TCP/IP model layer responsible for MAC addressing? Perhaps one of the most mysterious layers of the TCP/IP model is the Network Access Layer. It is the layer responsible for interfacing with your network’s architecture- something the everyday user can’t see. As we can’t physically interact with the Network Access Layer, how it works often eludes networking students.
By The OSI (Open System Interconnection) Model breaks the various aspects of a computer network into seven distinct layers. Each successive layer envelops the layer beneath it, hiding its details from the levels above. The OSI Model isn’t itself a networking standard in the same sense that Ethernet and TCP/IP are. Rather, the OSI Model is a framework into which the various networking standards can fit. The OSI Model specifies what aspects of a network’s operation can be addressed by various network standards. So, in a sense, the OSI Model is sort of a standard’s standard.
The first three layers are sometimes called the lower layers. They deal with the mechanics of how information is sent from one computer to another over a network.
Layers 4–7 are sometimes called the upper layers. They deal with how applications relate to the network through application programming interfaces. Layer 1: The Physical Layer The bottom layer of the OSI Model is the Physical Layer. It addresses the physical characteristics of the network, such as the types of cables used to connect devices, the types of connectors used, how long the cables can be, and so on. For example, the Ethernet standard for 100BaseT cable specifies the electrical characteristics of the twisted-pair cables, the size and shape of the connectors, the maximum length of the cables, and so on. Another aspect of the Physical Layer is that it specifies the electrical characteristics of the signals used to transmit data over cables from one network node to another. The Physical Layer doesn’t define any particular meaning for those signals other than the basic binary values 0 and 1.
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The higher levels of the OSI model must assign meanings to the bits transmitted at the Physical Layer. One type of Physical Layer device commonly used in networks is a repeater. A repeater is used to regenerate signals when you need to exceed the cable length allowed by the Physical Layer standard or when you need to redistribute a signal from one cable onto two or more cables. An old-style 10BaseT hub is also a Physical Layer device. Technically, a hub is a multi-port repeater because its purpose is to regenerate every signal received on any port on all the hub’s other ports. Repeaters and hubs don’t examine the contents of the signals that they regenerate.
If they did, they’d be working at the Data Link Layer, not at the Physical Layer. Layer 2: The Data Link Layer The Data Link Layer is the lowest layer at which meaning is assigned to the bits that are transmitted over the network. Data-link protocols address things, such as the size of each packet of data to be sent, a means of addressing each packet so that it’s delivered to the intended recipient, and a way to ensure that two or more nodes don’t try to transmit data on the network at the same time. The Data Link Layer also provides basic error detection and correction to ensure that the data sent is the same as the data received.