It will send any packet for networks it doesn??™t know about to the
default route??”which in this case would be configured to Router B??™s 192.168.15.5 interface.
Another way would be through a static route. Router A could contain an entry that tells
it that any packet destined for the 192.168.100.0 network should be forwarded over to
Router B. Lastly, Router A can be configured for dynamic routes, in which case it uses a
dynamic routing protocol to discover automatically that the 192.168.100.0 network is
accessible through Router B.
TIP If you aren??™t familiar with the notation of 192.168.10.10/24, it is merely a shortcut naming
convention to say that the IP address 192.168.10.10 has a subnet mask in which the first 24 bits
represent the network address. In standard notation for IPv4, the subnet mask would then be
255.255.255.0.
Dynamic Routing
When configured correctly, dynamic routing can reduce the administrative burden of
managing routers. If your network is complex, dynamic routing practically eliminates
or significantly reduces the amount of administrative overhead needed to maintain
static route information. Dynamic routing works through a process called router discovery
by which it automatically detects other routers in its neighborhood that are also
configured for dynamic routing. They then share information with each other regarding
other networks that are accessible through its interfaces, and using that information,
each router builds a dynamic routing table.
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