Thanks ,
I just read through it.
But it did not cover sysyem services such as NTP, TACPLUS, SNMP, SYSLOG, I am not sure if they use the same syntax on EX 4200 just like they do on EX 4300.
I did notice EX 4200 Vlan -l3 interface takes vlan.xx not irb.xx as we see on EX 4300.