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Link layer protocol defines the format of the packets exchanged between nodes at end of the link
Link layer protocol defines the format of the packets exchanged between nodes at end of the link
Framing
MAC layer adds a header and trailer to the packet
MAC layer adds a header and trailer to the packet
Data encapsulation
Link layer services define how to access channel for shared medium
Link layer services define how to access channel for shared medium
Link access
MAC layer adds a physical address (MAC address) that enables a frame to be delivered to a destination node
MAC layer adds a physical address (MAC address) that enables a frame to be delivered to a destination node
Frame assembly before transmission and frame disassembly upon reception of a frame
Frame assembly before transmission and frame disassembly upon reception of a frame
Link layer services encapsulates datagram into frame, adding header, trailer defines how to access channel for shared medium Defines the “MAC” addresses to identify source, dest different from IP address.
Link layer services encapsulates datagram into frame, adding header, trailer defines how to access channel for shared medium Defines the “MAC” addresses to identify source, dest different from IP address.
MAC layer provides three primary functions: ▪ Frame delimiting – Identifies a group of bits that comprise a frame, synchronization ▪ Addressing –adds a physical address (MAC address) that enables a frame to be delivered to a destination node. ▪ ___________
MAC layer provides three primary functions: ▪ Frame delimiting – Identifies a group of bits that comprise a frame, synchronization ▪ Addressing –adds a physical address (MAC address) that enables a frame to be delivered to a destination node. ▪ ___________
Link layer services MAC Sublayer Data encapsulation ❖ Frame assembly before transmission and frame disassembly upon reception of a frame. ❖ ___________
Link layer services MAC Sublayer Data encapsulation ❖ Frame assembly before transmission and frame disassembly upon reception of a frame. ❖ ___________
Link layer services MAC Sublayer Data encapsulation ❖ Frame assembly before transmission and frame disassembly upon reception of a frame. ❖ MAC layer adds a header and trailer to the packet ❖ Provides three primary functions: ▪ ___________
Link layer services MAC Sublayer Data encapsulation ❖ Frame assembly before transmission and frame disassembly upon reception of a frame. ❖ MAC layer adds a header and trailer to the packet ❖ Provides three primary functions: ▪ ___________
Link layer services MAC Sublayer Data encapsulation ❖ Frame assembly before transmission and frame disassembly upon reception of a frame. ❖ MAC layer adds a header and trailer to the packet ❖ Provides three primary functions: ▪ Frame delimiting – Identifies a group of bits that comprise a frame, synchronization ▪ ___________
Link layer services MAC Sublayer Data encapsulation ❖ Frame assembly before transmission and frame disassembly upon reception of a frame. ❖ MAC layer adds a header and trailer to the packet ❖ Provides three primary functions: ▪ Frame delimiting – Identifies a group of bits that comprise a frame, synchronization ▪ ___________
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Study Notes
Link Layer Protocol
- Defines the packet format for communication between nodes on a link.
- Responsible for the framing of data sent over the network.
MAC Layer Functions
- Adds a header and trailer to packets, ensuring correct transmission format.
- Provides a unique physical address (MAC address) for delivering frames to destination nodes.
- Identifies each frame through frame delimiting, marking the start and end of the data section.
- Enables synchronization between sender and receiver during data transmission.
Frame Management
- Handles frame assembly prior to transmission, organizing data for optimal transfer.
- Conducts frame disassembly upon receipt, extracting useful data from received frames.
- Encapsulates datagrams into frames, integrating necessary headers and trailers.
Addressing and Access
- MAC addresses distinguish between source and destination nodes, differing from IP addresses.
- Specifies access protocols to shared medium channels in networking environments.
Key Functions of MAC Layer
- Frame delimiting: Marks the boundaries of frames in data streams to ensure proper interpretation.
- Addressing: Attaches MAC addresses for accurate frame delivery.
- Additional primary functions that may be specified for further details.
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