This block has 8 weeks of study comprising  20 learning topics:
NE Module 1 Communications in a Connected World
NE Module 2 Online Connections
NE Module 3 Explore Networks with Packet Tracer
NE Module 4 Build a simple network
NE Module 5 Communication principles
NE Module 6 Network design and the access layer
NE Module 7 Routing between networks
NE Module 8 The Internet Protocol
NE Module 9 Dynamic addressing with DHCP
NE Module 10 IPv4 and IPv6 address management
NE Module 11 Transport layer services
NE Module 12 Application layer services
NE Module 13 Build a home network
NE Module 14 Connect to the internet
NE Module 15 Security considerations
NE Module 16 Configure network and device security
NE Module 17 Cisco switches and routers
NE Module 18 The Cisco IOS command line
NE Module 19 Build a small Cisco network
NE Module 20 Troubleshoot common network problems
Domain Name System (Wikipedia) http://en.wikipedia.org/wiki/Domain_Name_System
Subdomains (Wikipedia) http://en.wikipedia.org/wiki/Subdomain
Internet Protocol (IP) (Wikipedia) http://en.wikipedia.org/wiki/Internet_Protocol
IPv4 (Wikipedia) http://en.wikipedia.org/wiki/IPv4
IPv6 (Wikipedia) http://en.wikipedia.org/wiki/IPv6
TCP (Wikipedia) http://en.wikipedia.org/wiki/Transmission_Control_Protocol
Open Systems Interconnection (OSI) Model http://en.wikipedia.org/wiki/OSI_model
Training Videos
YouTube Videos
Warriors of the .Net http://www.youtube.com/watch?v=Ve7_4ot-Dzs
DanCourses https://youtube.com/user/danscourses
NetworkChuck https://www.youtube.com/@NetworkChuck
Other Web Links
Cisco Packet Tracer
Online resources produced by Kevin Large: https://www.youtube.com/playlist?list=PLudEgGG2Ote0M44h9Q8wXTzDnywjdljry
The OSI Model - Re-conceptualizing cyberspace