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ETHERNET - Coggle Diagram

- - - - Layer 2 broadcast to all devices on the Ethernet LAN
      - The node that matches the IP address in the broadcast will reply
      - If no device responds to the ARP request, the packet is dropped because a frame cannot be created
- - - - Handles communication between upper and lower layers
      - Takes the network protocol data and adds control information to help deliver the packet to the destination
    - - Constitutes the lower sublayer of the data link layer
        
        Implemented by hardware, typically in the computer NIC
        
        Two primary responsibilities:
        
        Media access control
        
        Responsible for the placement of frames on the media and the removal of frames from the media
        
        Communicates directly with the physical layer
        
        If multiple devices on a single medium attempt to forward data simultaneously, the data will collide resulting in corrupted, unusable data
        
        Ethernet provides a method for controlling how the nodes share access through the use a Carrier Sense Multiple Access (CSMA) technology
        
        Data encapsulation
        
        Frame deliminating
        
        identifies a group of bits that make up a frame, synchronization between the transmitting and receiving nodes
        
        Addressing
        
        each Ethernet header added in the frame contains the physical address (MAC address) that enables a frame to be delivered to a destination node
        
        Error detection
        
        each Ethernet frame contains a trailer with a cyclic redundancy check (CRC) of the frame contents
- - - - Connects end devices to a central intermediate device on most Ethernet networks
        
        Performs switching and filtering based only on the MAC address
        
        Builds a MAC address table that it uses to make forwarding decisions
        
        Depends on routers to pass data between IP subnetworks
    - - Switch Virtual Interface (SVI) – Logical interface on a switch associated with a virtual local area network (VLAN).
        
        Routed Port – Physical port on a Layer 3 switch configured to act as a router port. Configure routed ports by putting the interface into Layer 3 mode with the no switchport interface configuration command.
        
        Layer 3 EtherChannel – Logical interface on a Cisco device associated with a bundle of routed ports.