ccna 200-301 network simulator ns2 serves picture

ccna 200-301 network simulator ns2 serves picture.(1) LLC sublayer. The data link layer uses the LLC sublayer to communicate with upper layer protocols. The LLC performs software, which is executed independently of the hardware devices. In a computer, the LLC can be thought of as the computer's NIC driver, which interacts with the NIC to pass data between the media and MAC sublayers.The functions of the LLC sublayer are summarized as follows.. Communicating with upper layer protocols .. Converting packets from the network layer into frames .. Identifying network layer protocols .. Relatively independent from physical layer devices.(2) MAC sublayer. Media Access Control (MAC) is a sublayer below the Ethernet data link layer. Media access control is enforced by hardwareMedia Access Control is performed by hardware, typically a Network Interface Card (NIC). The Ethernet MAC sublayer has two main tasks: data encapsulation and media access control.' Data encapsulation provides 3 main functions.. Delimitation of frames: data encapsulation processing includes the encapsulation of frames prior to transmission and the decapsulation of frames after reception. The MAC sublayer adds headers and tails to the Layer 3 PDUs to form frames. frame processing provides important delimiter numbers to identify the set of bits that make up a frame. and delimiters between frames to synchronize the sender and receiver.. Addressing: encapsulation also provides data link layer addressing. Each Ethernet header added to a frame contains the physical address (MAC address) that allows the frame to be sent to a destination junction.