root@QFX5200# set system login user lab class super-user authentication plain-text-password 
New password:
Retype new password:

{master:0}[edit]
root@QFX5200# set system services ftp 

{master:0}[edit]
root@QFX5200# set system services telnet 

{master:0}[edit]
root@QFX5200# set interfaces em0 unit 0 

{master:0}[edit]
root@QFX5200# set interfaces em0.0 family inet address 192.168.1.6/24

{master:0}[edit]
root@QFX5200# commit 
configuration check succeeds
commit complete