dot net qr code library Lesson 4 in .NET framework

Draw QR Code ISO/IEC18004 in .NET framework Lesson 4

Lesson 4
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Read QR Code JIS X 0510 In VS .NET
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Configuring DNS Clients
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Encode Denso QR Bar Code In Visual C#
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Drawing QR Code In .NET
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Custom DNS Suffix Search Lists You can customize suffix searches by creating a DNS suffix search list in the Advanced TCP/IP Settings dialog box, as shown in Figure 4-15.
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Figure 4-15
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Adding suffixes to DNS queries
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The Append These DNS Suffixes option lets you specify a list of DNS suffixes to add to unqualified names. If you enter a DNS suffix search list, the DNS Client service adds those DNS suffixes in order and does not try any other domain names. For example, if the suffixes appearing in the search list in Figure 4-15 are configured and you sub mit the unqualified, single-label query coffee, the DNS Client service first queries for coffee.lucernepublishing.com and then for coffee.eu.lucernepublishing.com.
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Configuring Dynamic Update Options
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When configured to do so, DNS servers running on Windows 2000 or Windows Server 2003 can accept dynamic updates of A and PTR resource records. The updates themselves must be performed either by a DNS client running Windows 2000, Windows XP, or Windows Server 2003, or by a DHCP server (on behalf of a DNS client) running Windows 2000 or Windows Server 2003.
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For the exam, remember that UNIX-based DNS servers running Berkeley Internet Name Domain (BIND) 8.1.2 or later can accept dynamic updates.
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4
Configuring DNS Servers and Clients
Dynamic updates can occur only when clients are configured with a domain suffix that matches the zone name hosted by the preferred DNS server. In other words, for the record of a computer named Client1 to be dynamically updated in the lucernepublishing. com zone, the FQDN of that computer must be client1.lucernepublishing.com., and the client must specify as its DNS server the IP address of the DNS server hosting lucernepublishing.com.
Default Client Update Behavior
By default, DNS clients that are configured with a static IP address and an appropriate domain suffix attempt to register and update both A and PTR resource records with the preferred DNS server. However, DNS clients that obtain their address from a DHCP server attempt to register and update only their A resource records with the preferred DNS server. In this case, the PTR resource record is updated by the DHCP server when the lease is assigned. Windows clients that are not capable of performing dynamic updates such as DNS clients running Windows Me or Windows NT 4 can have both A and PTR resource records updated on their behalf by a specially config ured DHCP server. To configure a DNS client to attempt dynamic updates in DNS, make sure the Register This Connection s Addresses In DNS check box is selected on the DNS tab of the Advanced TCP/IP Settings dialog box, as shown in Figure 4-15. (It is selected by default.) This configures the DNS client to attempt to register and update the computer s full com puter name (primary domain name). When you clear this check box, the DNS client no longer attempts dynamic updates. If you configure a DNS suffix for the connection, you can also specify that the DNS client attempt to dynamically register and update an FQDN based on this connection-specific suffix. To do so, click the Use This Connection s DNS Suffix In DNS Registration check box. (It is not selected by default.) To force a DNS client to attempt dynamic registration of its A and PTR resource records, type ipconfig /registerdns at a command prompt.
Note
For Internet Connection Sharing (ICS) clients, Dynamic DNS updates are configured in a distinct manner. When DNS clients running Windows 2000, Windows XP or Windows Server , 2003 obtain their IP configuration from a computer running ICS, those clients can update their records in DNS only when the Use This Connection s DNS Suffix In DNS Registration is selected. You do not need to specify a connection-specific suffix. Instead, the primary DNS suffix forms the FQDN.
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