Chapter 7. Routing Concepts
Routing information between subnets is a key function of the network. This chapter reviews the elements you need to master.
Loopback Interface—For testing purposes and sourcing packets, loopback interfaces are critical. These virtual interfaces can be added to routers as needed. The practical number is really just a limit on your router resources. The space reserved for loopback interfaces is 127.0.0.0. In IPv6 ::1 is used. Different systems use different specific loopback addresses. 127.0.0.1 is often used.
Routing Loops—Some dynamic routing protocols (like distance vector) are so simple in their operation, they might be prone to a routing loop. This occurs when one router sends traffic to another, just to have that ...
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