I just finished Module 4 and had some questins regarding the interface configurations.
For command:
set ge-0/0/3 unit 0 family inet address 172.20.66.1/30
Where do you get the "Unit 0" part? Is that just a made up number? Why do you need a Unit number?
Also, for:
set ge-0/0/4 vlan-tagging
set se-0/0/4 unit 300 vlan-id 300 family inet address 172.18.1.2/30
Is that how you would set a vlan tag (like encapsulation dot1q vlan# for Cisco)? Also, again with the Unit number...