New lectures material

Hi guys!

Seems to me you added some new materials in this course, I mean iptables and cronjob lectures.
Can you update slides in order to upload it?


Hi @andys,

Thank you, KK team is working on it.

please add new more like tcp wrapper,backup and restore,rsync vs scp,Email-server like postfix,exim ,ISCSI server

Thanks @anu, for your suggestions.

please add nginx server also