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TCP/IP Utilities
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6 You can see that NSLOOKUP reports the new server we are connected to, and we can now send queries to the server for speci c records First, do a zone transfer of a zone on the server by typing ls glensworldloc and pressing enter 7 You can see in the output that the glensworldloc company has three hosts (host names of mail, ftp, and server100) and their associated IP addresses (as shown in the following illustration)
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8 Next we will get a list of email servers for the glensworldloc ctitious company Type set type=mx and press enter (as shown in the accompanying illustration) at the nslookup prompt to set the type of records and to view the mail exchange records Mail exchange records are the records in DNS that point to a company s mail servers
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9 To view the mail exchange records, type the domain name of the company and press enter In our example, we are typing glensworldloc and pressing enter The mail exchange records are shown in the accompanying illustration
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10 Type exit and press enter to quit the nslookup prompt 11 Type exit and press enter to quit the command prompt
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Let s look at some more popular solutions where these TCP/IP utilities can be used to solve everyday problems Be sure to try out these commands to see for yourself how they can solve the problem
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TCP/IP Utilities
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I need to download a file from another PC on the Internet What utility can I use I don t know what my DNS client settings are I can ping a server, but the NBTSTAT utility shows that its tables are empty If the other PC has FTP services installed, you can use the FTP utility Use the WINIPCFG or IPCONFIG command with the /All option The appropriate services on the remote computer are not started The services broadcast are dependent on items such as the Server or Workstation services Try increasing the timeout value for ping This might be an indication of a network problem between the client and remote server Use the WINIPCFG or IPCONFIG command Use the NSLOOKUP command to verify that the DNS server has the proper DNS name matched to the new IP address
If I ping a remote server, it does not respond; however, every now and then I can connect I need to find my computer s MAC address I need to find whether a specific DNS name is being properly resolved after I have changed the IP address
CERTIFICATION OBJECTIVE 610
Troubleshooting with TCP/IP Utilities
The two most common TCP/IP problems are network connectivity and name resolution In this section, you will learn how to troubleshoot these problems and how to determine where the problems truly reside Given the following scenario, how do you troubleshoot the problem Scenario: You are trying to use a third-party application to access a remote computer via TCP/IP You are unable to connect to the remote server To properly troubleshoot this problem, you must know where to begin Most communication problems with TCP/IP can be categorized as one of the following:
Troubleshooting with TCP/IP Utilities
Basic network connectivity problem Name resolution problem
It is very easy to determine which problem is occurring in a given situation Start by trying to access the resource via the IP address rather than the hostname by pinging the IP address For example, if the problem is related to name resolution, pinging hostname might not work, but pinging ipaddress will This indicates that, because you can communicate with the IP address but not the hostname, you are having name-resolution problems If you cannot access the resource via the IP address, this indicates a connectivity problem the system does not exist or it is turned off, or you have a network problem
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