You can set the hostname of the router with the hostname command.This is only locally significant,which means it has no bearing on how the router performs name lookups on the internetwork.
Router (config)#hostname Technews
Setting descriptions on an interface is helpful to the administrator and ,like the hostname,only locally significant.This is a helpful command because it can be used to keep track of circuit numbers,for example.
Technews (config)#int e0
Technews (config-if)#descripton Sales Lan
Technews (config-if)#int s0
Technews (config-if)#desc Wan to Miami circuit :6fdda4321
Viewing and saving configuration:
If you run through setup mode,it will ask you if you want to use the configuration you created.If you say yes,then it will copy the configuration running inDRAM,known as running-cnfig,to NCRAM and name the file startup-config.You can manually save the file from DRAM to NVRAM by using the copy running –config startup-config command.You can use the shortcut
Copy run start also.
Router#copy run start
Destination filename [startup-config]?return
Warning :Attempting to overwrite an NVRAM configuration previously written by a different version of the system image.overwrite the previous NVRAM
Building configuration . . . .