If you run the "Network" app on your Z and examine the Ethernet (usbd0) configuration, you'll see that the default configuration for USB networking for your Z is:
USB interface address of 192.168.129.201
subnet mask of 255.255.255.0
gateway (and, consequently, Linux host) address of 192.168.129.200
For simplicity, let's stick with these values for now.
By default, the usbd0 interface is not set up to activate on boot, so you can do a couple of things.
First, if you want to activate that interface manually, you can just run
# ifup usbd0at a konsole command line.
In addition, you can, if you want, set the networking configuration to activate this interface at boot time.
Either way, make sure that you've activated the interface before going on to the rest of this section.