cmd : xp only undocumented

CMD /knetdiag /debug 
CMD /knetdiag /fix

Autonet address
Bindings configuration
DC discovery
Default gateway
DNS
Domain Controllers for domain 
Domain membership
Hotfixes 
IP General configuration 
IP loopback ping
IP Security (IPSec service)  Note: run "ipseccmd /?" for more
IPX configuration information.
Kerberos
LDAP servers in Domain
Modem diagnostics
NetBios Resolution
NetBT name
NetBT transport
Netcard driver info (including interface Adapter)
Netstat information (IP, TCP, UDP, ICMP Stats)
Netware information
Network statistics information. 
RAS connection information 
Redir and Browser
Routing information
Routing table
Trust relationships
WAN configuration 
WINS service
Winsock