traceroute - print the route packets take to network host
ifconfig - interface configurator. view ip address and mac address
ping - (Packet INternet Groper) test connectivity between two nodes
netstat - display connection info, routing table information etc
dig and nslookup - dns information
route - shows and manipulate ip routing table
host - find name to IP or IP to name in IPv4 or IPv6 and also query DNS records
arp - (Address Resolution Protocol) view / add the contents of the kernel’s ARP tables
ethtool - view, setting speed and duplex of your Network Interface Card (NIC)
iwconfig - configure a wireless network interface
hostname - to identify in a network
system-config-network - configure network settings in a terminal GUI