The MAC sublayer is responsible for data encapsulation and accessing the media. It provides data link layer addressing and is integrated with various physical layer technologies. MAC Sublayer – This sublayer (IEEE 802.3, 802.11, or 802.15 for example) is implemented in hardware and is responsible for data encapsulation and media access control.This information allows multiple Layer 3 protocols, such as IPv4 and IPv6, to use the same network interface and media. It places information in the frame that identifies which network layer protocol is being used for the frame. LLC Sublayer – This IEEE 802.2 sublayer communicates between the networking software at the upper layers and the device hardware at the lower layers.Recall that LLC and MAC have the following roles in the data link layer: They are the Logical Link Control (LLC) and the Media Access Control (MAC), as shown in the figure. IEEE 802 LAN/MAN protocols, including Ethernet, use the following two separate sublayers of the data link layer to operate. Ethernet and the OSI Model Ethernet and the OSI ModelĮthernet is defined by data link layer and physical layer protocols. Ethernet supports data bandwidths of the following:Īs shown in the figure, Ethernet standards define both the Layer 2 protocols and the Layer 1 technologies. It is a family of networking technologies defined in the IEEE 802.2 and 802.3 standards. Ethernet uses wired communications, including twisted pair, fiber-optic links, and coaxial cables.Įthernet operates in the data link layer and the physical layer. This module starts with a discussion of Ethernet technology including an explanation of MAC sublayer and the Ethernet frame fields.Įthernet is one of two LAN technologies used today, with the other being wireless LANs (WLANs). Lab – Use Wireshark to Examine Ethernet Frames.
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