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MCSE : Security Specialist ping Is command, which forwards a packet to a URL over the Internet or within an Intranet. This verifies that TCP/IP is configured correctly and that a connection can be made. The basic ping command syntax is "ping hostname". Ping 127.0.0.1 This is the loopback address and verifies that the computer that you are pinging from can communicate via TCP/IP with its own ethernet adapter. arp Address Resolution Protocol, a TCP/IP protocol used to convert an IP address into a physical address (called a DLC address), such as an Ethernet address. A host wishing to obtain a physical address broadcasts an ARP request onto the TCP/IP network. The host on the network that has the IP address in the request then replies with its physical hardware address. There is also Reverse ARP (RARP) which can be used by a host to discover its IP address. In this case, the host broadcasts its physical address and a RARP server replies with the host's IP address. ARP Syntax: -a or arp -g Both of these commands do the same thing. They display the contents of your current arp cache. -s (IP address hardware address) This commands a static entry to the arp cache. -d (IP address) Removes and entry from the arp cache.