http://javarevisited.blogspot.sg/2014/07/9-difference-between-tcp-and-udp-protocol.html

http://www.objc.io/issue-10/ip-tcp-http.html
http://habrahabr.ru/post/215117/

https://help.ubuntu.com/community/NetworkConfigurationCommandLine/Automatic
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch02_:_Introduction_to_Networking
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch03_:_Linux_Networking
https://help.ubuntu.com/community/NetworkConfigurationCommandLine

Eli - The Computer Guy:

Fundamentals of iptables
https://www.youtube.com/watch?v=fQF2vEvqHgU
TCPIP and subnet masking
https://www.youtube.com/watch?v=EkNq4TrHP_U
Network mapping
https://www.youtube.com/watch?v=_uIOdTfp6Pw
Linux network configuration
https://www.youtube.com/watch?v=PEa1xopeufQ
Introduction to DHCP
https://www.youtube.com/watch?v=g7mroO_BLD0
Introduction to DNS
https://www.youtube.com/watch?v=VwpP8PUzqLw