java barcode reader sample code Check Your Domain Name System Con guration in Software

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Check Your Domain Name System Con guration
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DNS provides TCP/IP name-resolution services DNS is a central server that systems can use to query for name resolution For example, if any system on your network were to try to contact server1yourdomaincom, any system can query
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The HOSTS file used for FQDN name resolution
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Troubleshooting with TCP/IP Utilities
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DNS and have the name resolved In addition, if the DNS server adds an entry to the DNS server, all systems know about the change right away, because DNS is a central database that everyone uses (versus the HOSTS le, which all users have their own copy of) If you use DNS for name resolution, rst verify that you have the DNS client set up correctly on the workstation From a command prompt, type IPCONFIG /ALL to list the DNS servers con gured on a client If they exist and are correct, try pinging the DNS server to see if it is online If it responds, try changing your DNS server to another DNS server, if you have multiple DNS servers It is possible that one DNS server might have information that is different from what another has You also might need to contact your DNS administrator to verify that the name exists in DNS and has the correct information
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Check the LMHOSTS File
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The LMHOSTS le is similar to the hosts le but is used primarily for NetBIOS name resolution versus FQDN resolution It can be used to handle TCP/IP hostname resolution, but it is not recommended, because it is low in the name-resolution techniques order Like the hosts le, LMHOSTS is a text le that can be edited with any standard text editor If your network uses LMHOSTS les for NetBIOS name resolution and you cannot connect to the remote computer using its NetBIOS name, there could be an invalid entry in your LMHOSTS le Try scanning this le for the name of the remote machine Verify that it exists and that it contains the correct information If you are not using LMHOSTS, try checking your WINS server con guration settings The LMHOST le that comes with NT/2000/XP and Windows 2003 has a hidden le extension of SAM (for sample) You will not see this le extension unless you turn off the hiding of known le extensions in Windows, and the le will not work with a sam extension you will need to rename the le so that it is called simply LMHOSTS, not LMHOSTSsam
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Check Your Windows Internet Naming Service Con guration
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A WINS server provides NetBIOS name resolution much the way DNS servers provide TCP/IP hostname resolution If you use WINS for NetBIOS name resolution and you cannot connect to the other machine with its NetBIOS name, there might be a problem with your computer s WINS con guration
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6:
TCP/IP Utilities
Start by verifying that your system is con gured to use a WINS server From a command prompt, type IPCONFIG /ALL This will display the current WINS servers con gured for your computer If the correct servers are listed, try pinging the WINS server If you cannot ping the WINS server address, contact your WINS administrator to correct the problem You might also need to verify that the remote host you are trying to connect to is registered with WINS correctly
Make sure you understand the differences between hostname resolution and NetBIOS (machine) name
resolution The exam will quiz you on both name resolution scenarios
Check Your Domain Name Server Database
A domain name server (DNS) will provide the DNS domain name to IP address resolution when trying to connect to services using domain names, such as on the Internet If the name and IP address are not matched correctly in the database, you will be unable to access the proper PC for the services you are requesting For example, if you were on the Internet and wanted to access an FTP site, but the company has changed the IP address of the FTP server, you would type in the DNS name of the FTP server in the address bar, and this name would be matched to the old FTP IP address The FTP utility would try to query the old IP address for the FTP service If no FTP service exists on the old IP address, or a server is not currently using the old IP address, you would receive an error message Until the company updates the DNS servers on the Internet, the FTP server will be unreachable unless you can nd the new IP address of the FTP server After querying the DNS server and getting an IP address for the DNS name, you should try to ping the IP address returned to verify that the server at the IP address is functioning It is also possible that the DNS server might be unavailable and you will receive no response to your request for the DNS name resolution If this occurs, you will need to change your DNS server setting on the client to a server that is functioning, or contact someone about the DNS server and report that it is not functioning Now that you have been exposed to some of the most popular scenarios on a TCP/IP network where these utilities can be used, let s put your newfound skills to the test with some additional scenarios to help you troubleshoot
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