1. Encapsulation — A message that is sent over a computer network follows specific format rules in order for it to be delivered and processed. "The process of placing one message format inside another message format is called encapsulation." De-capsulation "It occurs when the process is reversed by the recipient and the letter is removed from the envelope."
  2. "Encapsulation is the process of prepending protocol information with information from another protocol."
  3. "When an Ethernet frame is sent out an interface, the Destination MAC address indicates the MAC address of the device, which is on this network, that will receive the Ethernet frame."
  4. "The Preamble and Start Frame Delimiter(SFD) indicate the beginning of an Ethernet frame."
  5. "Ethernet operates at layer 2, the data link layer, of the OSI model."
  6. "Ethernet switches make their forwarding decision based on destination MAC address."
  7. "Ethernet switches add entries to their MAC address table based on the source MAC address."
  8. "When a switch receives an Ethernet frame and the destination MAC address of that frame is not in its MAC address table, the switch will forward the frame out all ports excepting the incoming port."
  9. "Ethernet hubs are considered obsolete."