Cisco Open Shortest Path First OSPF Lab 1 (Authentication, Peering between 2 Areas, Summarization)

In this video I configure the following:

OSPF in Two different Areas
OSPF simple and MD5 authentication
OSPF Summarization (Internal)
Explain the basics of OSPF

Time codes
0:00 - Intro
4:02 - R1 Initial device and OSPF configuration
15:55 - R2 Initial device and OSPF configuration
18:23 - We've got our first OSPF peering! (R1 to R2)
20:10 - OSPF Router ID
21:39 - Designated Router and Backup Designated Router Explanation
26:28 - R3 Initial device and OSPF configuration
29:11 - OSPF DR/BDR election process
34:30 - Area 0 explanation
35:30 - Area 0 configuration
38:20 - OSPF Network type explanation
45:07 - OSPF Database and LSA Types explanation
51:57 - OSPF Summarization
1:02:20 - OSPF Authentication
1:15:55 - Summary