ifconfig -a

Display the configuration of all interfaces, both active and inactive

ifconfig eth0

Used to view the network settings on the interface eth0

ifconfig wlan0

Used to view the network settings on wlan0

ifconfig eth1 up

Used to active the network interface eth1

ifocnfig wlan0 down

Used to deactive the network interface wlan0

ifconfig eth1 down

Deactive the Network interface eth1

ifconfig wlan0 up

Active the network interface wlan0

ping [host]

Used to ping host ip shows result

arp

Check network card and shows ip address.

netstat

Reveiew network connection and open sockets

nslookup [Domain]

Used to find DNS related Query

tracerout [ip address]

Display no of hops and response time to get a remote system

whois [domain]

Get basic informaion about domain

telnet [ip address] [port]

Telnet connection !