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TABLE 4.7 The nslookup Options and Their Uses




Returns the responsible e-mail server for that domain


Sets the current domain name to <domain name>



Specifies the number of retries (the number of seconds is specified by X)


In this chapter you learned about many of the utilities for using and troubleshooting TCP/IP. These utilities include tracert, Ping, ARP, netstat, nbtstat, ipconfig, winipcfg, and nslookup.

Exam Essentials

Know how to describe and use the troubleshooting information and statistics that ARP, nbtstat, and netstat provide for you. ARP shows whether an IP address is being resolved to your MAC address (or someone else’s in case of conflicts). Netstat produces TCP/IP statistics, and nbtstat produces NetBIOS over TCP/IP statistics.

Know how to diagnose a network by using TCP/IP’s troubleshooting commands. Ping echoes back if a machine is alive and active on a network. Tracert shows the path that the Ping packets take from source to target. And Telnet enables a user to participate in a remote text-based session.

Know what the tracert utility does. The tracert utility finds the route from your computer to any computer on a network.

Know what the Ping utility does. Ping determines if a particular IP host is responding.

Know what the ARP utility does. ARP displays which MAC address is associated with a particular IP address.

Know what the netstat utility does. Netstat shows both inbound and outbound TCP/IP connections to which and from which the host is run.

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