Learning goal: Describe the basics of routing and how routing tables work.
Define some of the major routing protocols and what they do and identify non routable address space and how it’s used
Gain an understanding of the RFC system and how it made the inter what it is today
Today most intensive routing issues are almost exclusively handled by ISPs and only the largest of companies.
Router: A network device that forwards traffic depending on the destination address of that traffic
Basic routing steps:
Example:
IP addresses belong to the network not individual nodes inside the network.
computer A, 192.168.1.100 sends data to computper B, 10.0.0.10
Since the computer knows 10.0.0.10 isn’t on the same network it sends the packet to the the mac address of its gateway, the router.
Router receives the packet and strips away the data-link encapsulation leaving the network layer content.
By inspecting the content router knows 10.0.0.0/24 is the correct network for the destination IP.