c# .net print barcode Exam Highlights in Visual C#.NET

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Exam Highlights
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Before taking the exam, review the key points and terms that are presented below to help you identify topics you need to review. Return to the lessons for additional practice, and review the Further Reading sections in Part 2 for pointers to more information about topics covering the exam objectives.
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There are three ways that NetBIOS names resolution can occur: broadcasts, Lmhosts files, and WINS. Windows Internet Networking System (WINS) is a distributed database that stores NetBIOS names and services. To improve WINS database performance, transactions are written to transaction log files first, and then later written to the WINS database. In the case of non-WINS clients on a network, a WINS proxy may be configured to register, release, and query NetBIOS names. Before a conceptual NetBIOS name-resolution design can be created, a thorough understanding of the present network topology and documentation must be available. Special consideration should be given when designing a WINS infrastructure for a routed network because broadcast packets will not usually pass through a router. Selecting the server that will run the WINS service should be based on CPU speed, memory, hard disk drive type, and network adapter card. Placement of these servers should also be carefully analyzed. Fault tolerance and availability of the WINS service can be obtained through the use of multiple servers and replication.
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7
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Designing a WINS Structure
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In designing your WINS infrastructure, you must take into account the process of replicating your WINS database from one WINS server to another WINS server located on a different subnet. This will ensure that users from either subnet can resolve NetBIOS names. WINS servers can be configured as push, pull, and push/ pull partners. You should configure a WINS server as a pull partner if a slow link is used to replicate data. 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. Simple deletion and tombstoned deletion are two ways to do this.
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WINS proxy A WINS proxy is a WINS-enabled computer that is configured to register, release, and query NetBIOS names for clients that are non-WINS-enabled. Node types There are four different node types that determine how NetBIOS resolution will occur on a client workstation: B-node, H-node, P-node and M-node. Replication partners The replication process is done by configuring the WINS servers as one of the following: push, pull, or push/pull partners. Tombstoned deletion Tombstoning is the marking of records released from active use by the local WINS server. Tombstoned records will be automatically removed from all WINS servers at a specific time set by the administrator to prevent replication of records that have been marked for deletion.
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7
Designing a WINS Structure
Questions and Answers
Page 7-13
Lesson 1 Review
1. What are the four node types available for NetBIOS name resolution
a. B-node, which uses IP broadcast messages b. P-node, which uses a NetBIOS name server such as a WINS server c. M-node, which uses a mix of B-node and P-node d. H-node, which is a hybrid of B-node and P-node
2. A B-node client computer, which is not WINS-enabled, needs to access a resource on your network by using a NetBIOS name. There is no WINS server available on the client s network segment, but a WINS server is available across a router on a different subnet. What possible solutions are available to allow the client to access network resources using the NetBIOS names
One option available is to create an Lmhosts file on the client s workstation that has the NetBIOS name-to-IP address mappings for each resource the client needs to access. A more efficient solution would be to configure a WINS-enabled client computer on the segment to be a WINS proxy. The WINS proxy would send the NetBIOS name requested by the non-WINS-enabled client to the WINS server that is located across the router. The WINS server would check its database and return the IP address to the proxy, which would then return the IP address information to the non-WINS-enabled client.
3. WINS database utilizes five different file types for operation. List the five file types and a brief description of their function.
a. Log files are used to speed up the process of updating the WINS database and may be used to restore a WINS server back to the point of failure. b. Checkpoint files are used to indicate which transactions were written to the database file (Wins.mdb). c. The WINS server database file (Wins.mdb) contains two tables: IP address-to-Owner ID mappings, and Name-to-IP address mapping. d. The WINS temporary database file (Winstmp.mdb) used as a swap file area, or temporary area to aid in index maintenance. e. Reserved log files (Res#.log) are used in case of disk space errors where a log file cannot be created because there is not enough disk space available to create the log file.
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