vb.net generate code 39 barcode Lesson 5 in .NET

Maker ANSI/AIM Code 128 in .NET Lesson 5

Lesson 5
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Deploying Stub Zones
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Encode Code 128 Code Set B In Visual Basic .NET
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Primary DNS server: microsoft.com zone
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Primary DNS server: wa.microsoft.com zone
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Primary DNS server: ldn.microsoft.com zone
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Primary DNS server: mfg.wa.microsoft.com zone
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Primary DNS server: actg.wa.microsoft.com zone Stub zone: mgmt.ldn.microsoft.com zone
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Primary DNS server: mgmt.ldn.microsoft.com
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Query: ns.mgmt.ldn.microsoft.com
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Query: ns.mgmt.ldn.microsoft.com
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Figure 5-35
Using stub zones across domains
Stub Zone Resource Records
A stub zone contains SOA, NS, and A glue resource records for authoritative DNS servers in a zone. The SOA type identifies the primary DNS server for the actual zone (master server) and other zone property information. The NS resource record type contains a list of authoritative DNS servers for a zone (primary and secondary servers). The A glue resource records hold the IP addresses of the DNS servers authoritative for the zone.
Note
As with delegations, stub zones contain glue records in the zone data, but these glue records are not visible in the DNS console.
Stub Zone Resolution
When a DNS client performs a recursive query operation on a DNS server hosting a stub zone, the DNS server uses the stub zone s resource records to resolve the query.
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5
Implementing a DNS Infrastructure
The DNS server then queries the authoritative servers specified in the stub zone s NS resource records. If the DNS server cannot find any of the authoritative name servers listed in its stub zone, it attempts standard recursion. The DNS server stores the resource records it receives from a stub zone s authoritative servers in its cache and not in the stub zone itself; only the SOA, NS, and A resource records returned in response to the query are stored in the stub zone. The resource records stored in the cache are cached according to the Time to Live (TTL) value in each resource record. The SOA, NS, and A resource records, which are not written to the cache, expire according to the interval specified in the stub zone s SOA resource record, which is created during the creation of the stub zone and updated during trans fers to the stub zone from the original primary zone. When a DNS server receives a query for which recursion has been disabled, the DNS server returns a referral pointing to the servers specified in the stub zone.
Stub Zone Updates
When a DNS server loads a stub zone, it queries the zone s master server for the SOA resource record, NS resource records at the zone s root, and A resource records. During updates to the stub zone, the master server is queried by the DNS server hosting the stub zone for the same resource record types requested during the loading of the stub zone. The SOA resource record s refresh interval determines when the DNS server hosting the stub zone attempts a zone transfer (update). Should an update fail, the SOA resource record s retry interval determines when the update is retried. Once the retry interval has expired without a successful update, the expiration time as specified in the SOA resource record s Expires field determines when the DNS server stops using the stub zone data. You can use the DNS console to perform the following stub zone update operations:
Reload This operation reloads the stub zone from the local storage of the DNS server hosting it. Transfer From Master The DNS server hosting the stub zone determines whether the serial number in the stub zone s SOA resource record has expired and then performs a zone transfer from the stub zone s master server. Reload From Master This operation performs a zone transfer from the stub zone s master server regardless of the serial number in the stub zone s SOA resource record.
Exam Tip
For the 70-291 exam, you need to understand the differences among these three operations, which can apply to secondary zones as well as stub zones.
Lesson 5
Deploying Stub Zones
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Practice: Deploying a Stub Zone
In this practice, you create a stub zone on Computer1 that pulls transfers from the del egated subdomain sub.domain1.local.
Exercise 1: Creating a Stub Zone
In this exercise, you run the New Zone Wizard on Computer1 to create a stub zone.
Important The following exercise assumes that you have installed the DNS server on Computer2 by using the Windows Components Wizard (as described in 4, Lesson 3). In this case, zone transfers from the Sub.domain1.local zone are enabled by default but restricted to authoritative name servers. If instead you have installed the DNS server on Computer2 by using the Manage Your Server window to add the DNS server role, zone trans fers for all locally hosted zones are disabled by default. In this case, before beginning this exercise, be sure to enable zone transfers for the Sub.domain1.local zone and restrict zone transfers to servers listed on the Name Servers tab.
1. From Computer1, log on to Domain1 as Administrator. 2. At a command prompt, type the following command: dnscmd computer2 /recordadd sub.domain1.local @ ns computer1.domain1.local. This command adds Computer1 to the Name Servers tab in the Sub.domain1.local Properties dialog box in the DNS console on Computer2. 3. Open the DNS console, right-click the Forward Lookup Zones node, and select New Zone. The New Zone Wizard launches. 4. Click Next. The Zone Type page appears. 5. Select Stub Zone, clear the Store The Zone In Active Directory check box, and click Next. The Zone Name page appears. 6. In the Zone Name text box, type sub.domain1.local, and then click Next. The Zone File page appears. 7. Click Next to accept the default selection, Create A New File With This File Name. The Master DNS Servers page appears.
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