qr code generator vb net Lesson 2 in Visual Studio .NET

Encoder QR-Code in Visual Studio .NET Lesson 2

Lesson 2
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Configuring Zone Properties and Transfers
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right-clicking the server icon in the DNS console tree and then selecting Scavenge Stale Resource Records from the shortcut menu.
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Start Of Authority (SOA) Tab
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The Start Of Authority (SOA) tab, shown in Figure 5-21, allows you to configure the SOA resource record for the zone. When a DNS server loads a zone, it uses the SOA resource record to determine basic, authoritative information about the zone. These settings also determine how often zone transfers are performed between primary and secondary servers.
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Figure 5-21
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Start Of Authority (SOA) tab
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Serial Number The Serial Number text box on the Start Of Authority (SOA) tab con tains the revision number of the zone file. This number increases each time a resource record changes in the zone or when the value is manually incremented on this tab by clicking Increment. When zones are configured to perform zone transfers, the master server is intermit tently queried for the serial number of the zone. This query is called the SOA query. If, through the SOA query, the serial number of the master zone is determined to be equivalent to the local serial number, no transfer is made. However, if the serial num ber for the zone at the master server is greater than that at the requesting secondary server, the secondary server initiates a transfer. Primary Server The Primary Server text box on the Start Of Authority (SOA) tab con tains the full computer name for the primary DNS server of the zone. This name must end with a period.
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5
Implementing a DNS Infrastructure
Responsible Person When this text box is configured, it contains a responsible person (RP) resource record of the person responsible for administering the zone. An RP resource record specifies a domain mailbox name for the responsible person. The name of the record entered into this field should always end with a period. Refresh Interval The value you configure in the Refresh Interval field determines how long a secondary DNS server waits before querying the master server for a zone renewal. When the refresh interval expires, the secondary DNS server requests a copy of the current SOA resource record for the zone from its master server source, which then answers this SOA query. The secondary DNS server then compares the serial number of the source server s current SOA resource record (as indicated in the master s response) with the serial number of its own local SOA resource record. If they are dif ferent, the secondary DNS server requests a zone transfer from the primary DNS server. The default value for this setting is 15 minutes.
Exam Tip
Increasing the refresh interval decreases zone transfer traffic.
Retry Interval The value you configure in the Retry Interval box determines how long a secondary server waits before retrying a failed zone transfer. Normally, this time is less than the refresh interval. The default value is 10 minutes. Expires After The value you configure in the Expires After box determines the length of time that a secondary server, without any contact with its master server, continues to answer queries from DNS clients. After this time elapses, the data is considered unreli able. The default value is 1 day. Minimum (Default) TTL The value you configure in the Minimum (Default) TTL box determines the default Time to Live (TTL) that is applied to all resource records in the zone. The default value is 1 hour. TTL values are not relevant for resource records within their authoritative zones. Instead, the TTL refers to the cache life of a resource record in nonauthoritative servers. A DNS server that has cached a resource record from a previous query discards the record when that record s TTL has expired.
Exam Tip
If you have deployed caching-only servers in your network in addition to a primary server, increasing the minimum TTL can decrease name resolution traffic between the cach ing-only servers and the primary server.
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