Router Configuration in CLI mode(CISCO)

//First sub_netting the IP address & Enter into “configuration mode”:

Router >enable

Router #configure terminal

//Enter configuration commands, one per line.  End with CNTL/Z.

Router (config)#

//configure the ip address for firstEnthernet  0/0 port:

Router(config)#interface fastEthernet 0/0

Router(config-if)#ip address 172.16.1.254 255.255.255.0 //ip address and subnet mask

Router(config-if)#no shutdown

Router(config-if)#exit

//configure the ip address of the serial port 0/0/0 port:

Router(config)#interface serial 0/0/0

Router(config-if)#ip address 172.16.3.1 255.255.255.0 //ip address and subnet mask

Router(config-if)#clock rate 64000

Router(config-if)#no shutdown

//now keep the router passward protecteed:

//To change hostname

Router(config)#hostname R1-ISP

R1-ISP (config)#enable password cisco

R1-ISP (config)#line console 0

R1-ISP (config-line)#password cisco

R1-ISP (config-line)#login

R1-ISP (config-line)#exit

// now enable the Telnet service:

R1-ISP (config)#line vty 0 4

R1-ISP (config-line)#password class

R1-ISP (config-line)#login

R1-ISP (config-line)#exit