Creating Symbolic link:
Step 1: Open command prompt
Step 2: mklink /d SymbolicLinkPath TargetPath
example: mklink /d C:\testfolder\SymbolicLink d:\testfolder\folderorfiletobelinked

Networking related commands:

Find Your IP Address:
Step 1: Open command prompt
Step 2: ipconfig

DNS can be flushed using following command:
Step 1: Open command prompt
Step 2: iipconfig /flushdns

Following might be helpful for checking whether the connectivity between your pc and remote machine(IPaddres, webAddress)

Ping:
Step 1: Open command prompt
Step 2: ping IPaddressOrWebAddress
example ping google.com

Tracert
tracert IPaddressOrWebAddress
Step 1: Open command prompt
example tracert google.com

Telnet
telnet can be used to check port. For this telnet client needs to be installed
Step 1: Open command prompt
Step 2: itelnet IPaddressOrWebAddress port
example telnet google.com 80

Netstat
displaying all sorts of network statistics
Step 1: Open command prompt
Step 2: netstat