Stop guessing and start diagnosing! This video covers the seven most useful PowerShell commands I use daily to troubleshoot and diagnose network issues, from checking port accessibility to resolving DNS caching problems. We dive deep into Test-NetConnection (TNC) for firewall testing, master Netstat to see open ports and established connections, and use the classic Ping with advanced flags to test maximum transmission unit (MTU). Plus, stick around for two bonus commands that are essential for wireless and ARP table analysis! 0:00 | Intro: Top 7 PowerShell Commands for Network Diagnosis 0:57 | Command 1: Test-NetConnection (TNC) - Ping & ICMP Check 1:35 | TNC Advanced: Checking TCP Port Status (e.g., HTTPS 443) 4:16 | Command 2: IPconfig /all - View Full Network Configuration 5:14 | IPconfig Clip Trick: Copying Output to Clipboard 6:00 | IPconfig Essential: Release and Renew DHCP Lease (Safe Remote Trick) 8:20 | Command 3: Netstat - View Live Connections (Established vs. Listening) 10:49 | Netstat -ANB Flags: Fast Lookup with PID and Program Name 12:04 | Command 4: NSLookup - Testing DNS Resolution & Specific DNS Servers 13:59 | NSLookup Advanced: Checking MX (Mail) Record Types 15:03 | Command 5: Ping - Continuous (-T) and Troubleshooting MTU Size (-F -L) 18:30 | Bonus Command 6: Netsh WLAN - Diagnose Wireless Connection & AP Roaming 20:28 | Bonus Command 7: ARP -A - View MAC Address to IP Mappings #PowerShell #NetworkTroubleshooting #ITSupport #Netstat #TestNetConnection #TNC #Ping #NSLookup #ITPro #SysAdmin #Networking