Just a Programming Blog

Nick Urbanik, a computer and operating systems instructor, has made
much of his teaching
material freely available on his site at nicku.org. This free
learning and training content covers the Linux Operating System, System
Administration, Network Administration, Perl, and C Programming. His
material includes lectures, notes, and quizes with questions and
answers.

Nick Urbanik’s Learning Topics:

LPIC 102—Preparing for
the LPIC 102 Certification Exam
 - Topic [...]

Here is lots of information from Orbit-computer-solutions
for learning more about Networking, IP Addressing, Routers,
Wireless Networking, VLANs, DHCP, and NAT. There
are 

Networking
Fundamentals
 - Routers
 - Broadband 
 - Switches
 - Wireless
Networking
 - Wireless
Network Diagram
 - Wired
Network Diagram
 - Wireless
Routers
 - Linksys
Wireless Routers
 - Intermediary
devices and role on network
 - Wireless
Network Security
 - WEP,
WPA, WP-2, 802.1x

IP
Addressing
 - Types
of IPv4 addresses
 - IP
address and Class
 - Network
Address
 - Broadcast
Address
 - Host
Address
 - [...]