What does the LLC sublayer do?
The LLC sublayer provides multiplexing mechanisms that make it possible for several network protocols (e.g. IP, IPX and DECnet) to coexist within a multipoint network and to be transported over the same network medium. It can also provide flow control and automatic repeat request (ARQ) error management mechanisms.
What is LLC and MAC?
Logic Link Control (LLC) Layer and Medium Access Control (MAC) layers are the sublayers of the Data link layer in the OSI reference model. OSI is a 7 layer architecture which contains 7 layers. Each layer has its own specific functionality. All these 7 layers in the OSI model are used to transmit data.
What is DSAP and SSAP?
SSAP (Source SAP) is an 8-bit long field that represents the logical address of the network layer entity that has created the message. DSAP (Destination SAP) is an 8-bit long field that represents the logical addresses of the network layer entity intended to receive the message.
Is LLC implemented in software?
LLC is implemented in software, and its implementation is independent of the hardware. In a computer, the LLC can be considered the driver software for the NIC. The NIC driver is a program that interacts directly with the hardware on the NIC to pass the data between the MAC sublayer and the physical media.
What are the functions of LLC in computer network?
The primary function of LLC is to multiplex protocols over the MAC layer while transmitting and likewise to de-multiplex the protocols while receiving. LLC provides hop-to-hop flow and error control. It allows multipoint communication over computer network. Frame Sequence Numbers are assigned by LLC.
Which two functions are performed at the LLC sublayer of the OSI data link?
Provides data link layer addressing. Implements a trailer to detect transmission errors. Provides synchronization between source and target nodes.
What are the functions of MAC layer?
The MAC layer functions as an adaptation layer between the physical layer and the upper protocol layers. Its main task is to receive MAC service data units (MSDUs) from the layer above, encapsulate them into MAC protocol data units (MPDUs) and pass them down to the physical layer for transmission.
What is LLC in Ethernet?
The logical link control (LLC) is the upper sublayer of the data link layer of the open system interconnections (OSI) reference model for data transmission. It acts act an interface between the network layer and the medium access control (MAC) sublayer of the data link layer.
What is LLC protocol Wireshark?
Logical Link Control (LLC, IEEE 802.2) protocols as its transport protocol: Ethernet: LLC can be used for packets on Ethernet networks, although many protocols don’t use it when running atop Ethernet. FDDI: LLC is used for data packets on FDDI networks. TokenRing: LLC is used for data packets on TokenRing networks.
Which two functions are performed at the LLC sublayer of the data link layer to facilitated Ethernet communication?
Performs data encapsulation. Controls the NIC responsible for sending and receiving data on the physical medium. Integrates various physical technologies.
Which two function are performed at the MAC sublayer?
Controls the NIC responsible for sending and receiving data on the physical medium. Places information in the frame that identifies which network layer protocol is being used for the frame. Adds Layer 2 control information to network protocol data. Enables IPv4 and IPv6 to utilize the same network interface and media.
