Windows Command Tools To Troubleshoot Network Connectivity

arp –a	Shows gateway MAC address.
gpresult	Starts the Operating System Group Policy Result tool
ipconfig /all	Displays the full TCP/IP configuration for all adapters
ipconfig /flushdns	Flushes the DNS resolver cache. Helpful when troubleshooting DNS name resolution problems
nbtstat –a [MachineName]	Obtains info from WINS or LMHOST (discovers who is logged on)
nbtstst –A [IP]	Gets info from WINS or LMHOST (discovers who is logged on)
nbtstat -R	Purges and reloads the remote cache name table
nbtstat –n	Lists local NetBIOS names.
nbtstat -r	Useful for detecting errors when browsing WINS or NetBIOS
netstat -ab	The b switch links each used port with its application
netstat -an	Shows open ports
netstat -an 1 | find "15868"	Locates only lines with the number 15868 and redisplays every one second
netstat -an | find "LISTENING"	Shows open ports with LISTENING status
net use	Retrieves a list of network connections
net use file://1.2.3.4/	Sees if the machine can poll IP 1.2.3.4
net user	Shows user account for the computer
net user /domain	Displays user accounts for the domain
net user /domain [UserName]	Shows account details for specific user
net group /domain	Shows group accounts for the domain
net view	Displays domains in the network
net view /domain	Specifies computers available in a specific domain
net view /domain: [DomainName] | more	Shows user accounts from specific domain
net view /cache	Shows workstation names
nslookup	Looks up IP/hostnames and displays information helpful in diagnosing DNS issues
ping -a [IP]	Resolves IP to Hostname
ping -t [IP]	Pings host until stopped
set U	Shows which user is logged on
set L	Shows the logon server
telnet [IP] [port]	Confirms whether the port is open