====== Basic Switch Logic ======

The primary role of a switch is to get **//frames//** from point **A** to **B** on a **LAN**. It does this by examining Source and Destination MAC addresses. Not unlike a router which instead uses IP addresses.

**EXPAND ON THE FOLLOWING:**
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=== SWITCH FUNCTIONS ===
  * Forward or Filter frames based on ''//MAC address//''
  * Learn and fill MAC / CAM table based on ''//incoming//'' MAC address
  * Prevent Layer 2 loops with STP


=== SWITCH FORWARDING LOGIC ===
  * Switch receives / examines frame

  * Is the frame's ''//source//'' MAC in the table?
    * NO: Add source MAC to table with associated port #

  * Is the frame's ''//destination//'' MAC in the table?
    * NO: Flood frame out all ports in same VLAN except the port it originated from.
    * YES: Forward frame out appropriate port.

  * If destination MAC is unknown | ''//broadcast//'' | ''//multicast//''
    * Flood frame out all ports in the same //VLAN// except the port it originated from.

== FILTERING ==
AKA, not sending the packet out X interface. Port Security is a good example of this.