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LAN Switching Fundamentals (LAN primary job: to FWD frames to correct…

- - - - Deciding when to forward frame or when to filter (not forward ) a frame based on destination MAC address
      - Preparing to FWD frames by learning MAC address by examining source MAC address of each frame rcv by switch
      - Preparing only 1 copy of frame to destination by creating layer 2 loop free with other switches (using STP)
  - - - uses dynamically built table list MAC address and outgoing interfaces
      - Switch compare frame's destination MAC add to this table to decide switch fwd a frame or ignore
  - - - STP Good: frames don't loop indefinitely
      - STP Bad: takes some work to balance traffic across redundant links
- - - - if outgoing not = received-switch FWD frame out outgoing int
      - if outgoing = received - switch ignores frame and not FWD