Hello and welcome to SlackLand,
the slackbook is slightly outdated on that respect: nowadays most network cards and wireless adapters are automatically recognized and the relevant modules automatically loaded at boot. Therefore the netconfig script no more creates a rc.netdevice file[1] as that task is performed by udev: in other words the card detection and loading of the relevant module is done by udev. But yes your ethernet network card is recognized, else you couldn't get a connection. The same goes for the wireless adapter.
This is easy to check: as root, type:
Code:
lspci -knn| grep -iA3 net
Also, a new configuration option "NetworkManager" is now available in netconfig, that comes handy because it can manage wireless connections in addition to wired ones. Probably that's what you rightly chose, that's why ethernet as well as the wlan work flawlessly out of the box.
[1]It can still, probing for network cards, but only if you uncomment the line that just contains "DONOTPROBE=true". I guess that few people need to do that nowadays.