show ip interface brief | exclude unassigned
=> show interface with IP address
show running-config | begin router
=> show routing protocol configuration
show ip protocols
=> show the various routing protocols configured, its participating network and its various running timer
show interface trunk
=> show the interface which are configured as trunk and using 802.1q or ISL encapsulation
show ip route
=>show the routing table
R => RIP
O => OSPF
D => EIGRP
B => BGP
C => connected
S => static
* => default route
