c# qr code generator dll Designing a WINS Server Placement Strategy in Visual C#

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Designing a WINS Server Placement Strategy
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Your goal, when designing a WINS strategy for your network infrastructure, is to have the WINS service available to client workstations when they need it. Availability is at risk when there is only one WINS server configured to support a large number of users. If that server should fail, all of the users will now need to resolve NetBIOS names using one of the other methods covered earlier: Lmhosts files or broadcasts. In situations in which a slow link exists between two subnets, it is highly recommended that a WINS server be placed in both subnets to maximize performance of client name-resolution requests. Just as much thought had to go into deciding where to place your DNS servers, you can see that placing your WINS servers in the right location can also influence performance. For example, a remote site that has several thousand users may warrant placing a WINS server there to avoid the prospect of sending the traffic generated from name registrations over a 128Kb frame relay connection. Once again, your network topology diagrams are critical in making such decisions.
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Performance Over Slow Links
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Even though WINS servers are used to reduce traffic, specifically broadcast traffic, there is still network traffic generated by clients when the client:
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Registers a NetBIOS name Renews a NetBIOS name Releases a NetBIOS name Requests a NetBIOS name resolution
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In Lesson 1, you learned that on startup, a WINS-enabled workstation would automatically register its NetBIOS name and IP address with a designated WINS server. On larger networks this creates the biggest traffic load. The WINS-enabled client also
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Designing a WINS Structure
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registers its user name, domain name and, depending on the operating system version, any services it may be running. Windows XP clients that are WINS-enabled usually register more NetBIOS names than other WINS-enabled clients. Windows XP clients can register names for the Server service, the Replicator service, Messenger service, the Computer Browser service, and additional services. Figure 7-6 illustrates the WINS database entries for a WINS-enabled client workstation running Windows XP.
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Figure 7-6 WINS database entries from XP client registration
Each time one of the client machines shuts down at the end of the day, it releases these names, also creating additional traffic. As you can see, designing your WINS infrastructure over a routed network poses additional problems and is more complex. If a WINS server is across a router, and if thousands of workstations were started up each morning and shut down each night, you can see the possibility of a lot of traffic being generated over the WAN link. In the next lesson, you will look at the additional traffic created by replication occurring between multiple WINS servers. In any event, you should be aware of how your network topology affects your NetBIOS name-resolution strategy.
Fault Tolerance
When designing your WINS infrastructure, you should consider the possibility of something going wrong because it usually does. Having only one WINS server on a routed network, regardless of how small the network is, can create problems if a WINS server unexpectedly crashes due to hardware failure or is inadvertently shut down for maintenance by a junior network administrator who is not aware that the server is running WINS. By placing secondary WINS servers throughout your network infrastructure, you reduce the effects of one server being unavailable for your clients. If cost is a factor preventing you from implementing this, Lmhosts files configured with #PRE-tag entries for critical servers are a good way of ensuring that clients can access network resources in the event of a downed router or WINS server.
Lesson 2
Designing a WINS Infrastructure
7-19
Real World Label Your Servers
In large and small organizations alike, it is not uncommon to see five or six servers side by side in a cipher-locked server room with no labels on them. The labels, wherever they are, should include such information as computer name, IP configuration, hardware specs, operating system (OS) information, and one of the most important pieces of information of all a list of the services running on the server. Why is this information so important Suppose one of these servers has a hardware failure. Is it important for you to know that the server in question is a primary WINS server, or that it is your only DNS server on the network Of course it is. In fact, this information is vital in helping you to decide on the direction you will take in rectifying the problem. For security reasons, you may want to have this documentation in a book that is not in close proximity to the servers. This is added protection in case an intruder is able to get in front of your servers. Most likely, if this is the case, it s too late to worry about securing this information. If an intruder is already in your house looking through your belongings in your bedroom safe, it s a little late to worry about whether or not you left your personal phone book out for his perusal. Servers should all be locked in secure areas, first and foremost.
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