Here are a few of the TCP/IP utilities you need to be familiar with for the networking exams.

ARP (Address resolution protocol) is used to resolve IP addresses to MAC addresses.

RARP (Reverse address resolution protocol) resolves MAC addresses to IP addresses.

PING (Packet Internet Groper) is used to check for connectivity between two hosts.

Tracert (Trace route) command is used to check for bottlenecks in a network.

Netstat is used to view TCP/IP connections.

Nbtstat is used to to track NetBIOS over TCP/IP statistics.

This is only a partial list of the commands and a very brief description. It is a good idea to sit at a console and go through all of the commands with the use of the help command. . You can get help from any command by using the /? switch after the command. Knowing these commands is a necessity when testing on the CompTIA® Network+, or the Microsoft® 2003 networking exams.
An important point is that the commands are not case sensitive but some of the switches are