EXPLAIN in Technical Terms Why this is IMPORTANT for Network Troubleshooting?

PART (1)

1). IP Addressing?

2). APIPA and Alternate Addressing

3). DHCP

4). DHCP Relay

5). DNS?

PART (2)

1). NTP?

2). IP Version 6

3). Multicast

4). Troubleshoot IP Configuration Issues

5). Troubleshoot IP Communications

6). Troubleshoot DNS