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#Configuring a cisco router

R1>en
R1#show show ip route                                           #Displays all routes 
R1#conf t
R1(config)# hostname R1

#Configuring INTERFACES

R1>en
R1#show ip interface brief #Displays all the interfaces
R1#conf t
R1(config)#int g0/0/0                                           #You choose the specific interface to configure
R1(config-if)#ip address 192.168.13.2 255.255.255.0             # one MUST include the subnet mask
R1(config-if)#description ## to SW1 ##                          #This is a descriptive message
R1(config-if)#no shut                                           #this enables the interface


#Configuring STATIC Routes

R1>en
R1#show show ip route                                           #Displays all routes 
R1#conf t
R1(config)#ip route 192.168.1.0 255.255.255.0  192.168.12.2     #192.168.1.0 (destination), 255.255.255.0 (MASK), 192.168.12.2 (Next Hop)

#DELETING a route

R1>en
R1#show show ip route                                           #Displays all routes 
R1#conf t
R1(config)# no ip route 192.168.1.0 255.255.255.0 192.168.12.2


#Configuring a DEFAULT GATEWAY
** Disclaimer, the PC is actually a Router **

#PC>en
#PC1#show show ip route                                           #Displays all routes 
#PC1#conf t
#R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.1.254               #0.0.0.0 (destination), 0.0.0.0 (MASK), 192.168.1.254 (Next hop)