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:star: :one: Packet Forwarding (:jack_o_lantern: Незнакомые слова (:one:…

- - - - The first :two::four:-bits are assigned to device manufacture
        or OUI - Organizationally Unique Identifier
      - The second :two::four:-bits are also unique
      - Network Broadcast with MAC FF:FF:FF:FF:FF:FF
        are not forwarded beyond a Layer :three: boundary
    - - Carrier Sense Multiple Access / Collision Detection (CSMA / CD) ensures that only one device talks at time in a collision domain
      - Unknown unicast flooding - the switch forwards the packet out of every switch port if packet contains a destination MAC address that isn't in the switch's MAC address table
      - Broadcast domain - all devices reside in the same Layer :two: segment
    - - Provides logical segmentation by creating multiple broadcast domains on the same network switch
      - Defines in IEEE 802.1Q
      - Extra :four: bytes
        header in Ethernet frame
        
        Tag protocol identifier (TPID) - :one::six:-bit field set to 0x8100 to identify the packet as an 802.1Q packet
        
        Priority code point (PCP) - :three:-bit field indicates a class of service (CoS) as part of Layer :two: quality of service (QoS) between switches
        
        Drop eligible indicator (DEI) - :one:-bit field indicates whether the packet can be dropped when there is bandwidth contention
        
        VLAN Identifier (VLAN ID) - :one::two:-bit field specifies the VLAN associated with a network packet
      - Logic of VLAN
        
        VLAN :zero: is reserved for 802.1P traffic and cannot be modified or deleted
        
        VLAN :one: is the default VLAN and cannot be modified or deleted
        
        VLANs :two: to :one::zero::zero::one: are in the normal VLAN range and can be added, deleted, or modified as necessary.
        
        VLANs :one::zero::zero::two: to :one::zero::zero::five: are reserved and cannot be deleted
        
        VLANs :one::zero::zero::six: to :four::zero::nine::four: are in the extended VLAN range and can be added, deleted, or modified as necessary