Routing concepts describe the way a packet transits a network from source host to destination host. Layer 2 and Layer 3 protocols are required to receive the packet, deencapsulate it, determine the destination, determine the exit interface, encapsulate it and transmit it.
The following are the routing concepts covered in the CCNA:
- 3.1.a Packet handling along the path through a network
- 3.1.b Forwarding decision based on route lookup
- 3.1.c Frame rewrite