how to generate and print barcode in c# windows application Designing a WINS Structure in Visual C#.NET

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Designing a WINS Structure
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Pull Partners
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A pull partner requests an update of its WINS database from another WINS server configured as a push partner. You can configure a pull partner to notify their pull partners when one of the following occurs:
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The WINS server starts. A time interval has elapsed.
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Pull partners should be configured over slow links connecting WINS servers. You can choose to have a pull occur when little traffic is going over the link, such as late at night.
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This is the default configuration of a WINS server. A push of an updated WINS database will occur as discussed previously, and the WINS server is also configured to pull WINS database information from another WINS server at a designated time. This type of configuration is recommended in most cases.
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Remember that push partners are used over high-speed links, whereas pull part ners are usually configured over slower WAN links.
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After configuring both WINS servers as Push/Pull partners, both servers, after replication, will contain NetBIOS records from both subnets. Now, any WINS-enabled client on either subnet can access resources on a different subnet using the NetBIOS name of that resource.
Deleting and Tombstoning Records
As your WINS database grows and replicates its records to other WINS servers, some records become obsolete and need to be deleted from the database. Deleting records from a WINS database is a very simple process; all you need to do is select the records and press the delete key. However, there are two methods of deleting records from a WINS database:
Simple Deletion A simple deletion deletes records from your local WINS server. If these records have been replicated to other WINS servers, the records will remain in the databases of those WINS servers. These records can subsequently reappear on your local WINS server after replication has occurred, which could defeat your intended purpose. Tombstoned Deletion Tombstoning is the marking of records released from active use by the local WINS server. Hence, users attempting a name-resolution query from that local server will receive an error because the records are marked for deletion; however, the records will remain present in the WINS database for replication purposes until a specified time period has elapsed. At that time, the records will be automatically removed from all WINS servers.
Lesson 3
Designing a WINS Replication Strategy
7-25
Securing Your WINS Infrastructure
Any time replication information from one server will traverse a network to reach another server, you risk the possibility of interception of that data. Just as DNS zone transfers are susceptible to this type of attack, so is WINS replication data. Because WINS servers may be exposed to the Internet just like DNS servers are, security should be of concern. Replication traffic between WINS servers across a public network such as the Internet can be intercepted. NetBIOS names and IP addresses of your servers and workstations can be made available to unauthorized personnel. As with DNS, there are a couple of options you can use to protect your WINS replication data:
Encryption using Internet Protocol Security (IPSec ) Encryption using a Virtual Private Network (VPN )
As a network administrator, it is very important that your design always includes security measures to protect the information and network resources of your company. All WINS servers should be secured by cipher-locked doors, and access should be restricted to authorized personnel using Active Directory directory services.
Practice: Designing a WINS Replication Strategy
In this practice, you will design a WINS replication strategy for Northwind Traders. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter.
Scenario
Northwind Traders has decided to include WINS as part of its Windows Server 2003 Active Directory design. Northwind Traders current network infrastructure is illustrated in the diagram below. The IT management team wants to see a proposal for an effective WINS replication scheme that will ensure the smooth implementation of WINS. Specifically, the proposed WINS design must address the issue of fault tolerance.
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