Mark Furneaux | Comprehensive Guide to pfSense 2.3 Part 4: Networking Crash Course @TheUbuntuGuy | Uploaded January 2016 | Updated October 2024, 3 hours ago.
In this video I attempt to try and distill 2 layers of the OSI network model into a single video. I will resume configuration videos in Part 5.
I realize that I misspoke a few times, but I did it all in one take and didn't want to reshoot everything.

A sort-of-index:
Switches: 5:45
OSI Model: 7:07
MAC: 9:24
Switch Example: 12:14
IP Addresses: 19:07
Subnet Masks: 20:55
Routers: 28:52
Router Example: 31:25
ARP: 35:41
ARP Example: 36:41
DHCP: 39:24
DHCP Example: 41:32
Gateways: 46:03
NAT: 50:20
NAT Example: 52:38
Firewalls: 57:19

Part 1: youtube.com/watch?v=agieD5uiwYY
Part 2: youtube.com/watch?v=0spAIaWb7x0
Part 3: youtube.com/watch?v=7nr9HNZ7OmY
Part 5.1: youtube.com/watch?v=rgupXMlz3is
Part 5.2: youtube.com/watch?v=bJ3AXlnhTSM
Part 5.2-2: youtube.com/watch?v=a-NdPyCHaPI
Part 5.3: youtube.com/watch?v=ud9TgWSolNw
Part 5.4: youtube.com/watch?v=h8A5tcUIOcw
Part 6: youtube.com/watch?v=QC_nXreJCvc
Part 7: youtube.com/watch?v=s3VXLIXGazM
Part 8: youtube.com/watch?v=UZR2LNBtzrw
Part 9: youtube.com/watch?v=rF46PNid1Mo

I have a second channel:
youtube.com/channel/UCN3Dgu6CVBcecDkc5DmIIqw