CCNA Crash Course: Day 1

Posted on Wednesday, March 23, 2011, under

We start with 3 basic layers:

  1. Physical - (Cables, radio waves, binary 1’s and 0’s, etc).
  2. Data Link - (Switch/Bridge devices/MAC address)
  3. Network - (Routers)
Routers are the devices which are given the most focus. Here is the back of an example router:
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