print barcode labels in c# Lesson 1 in Visual Basic .NET

Creator ECC200 in Visual Basic .NET Lesson 1

Lesson 1
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Determining Name Resolution Requirements
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4-13
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Important If you plan to use your ISP s DNS servers for any functions other than client name res olution, be sure that the DNS server implementation they are using is compatible with the Windows Server 2003 DNS servers you are using, and that they are able to provide the services you need.
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You might also want to consider splitting up these functions by using several DNS servers. For example, you can use your ISP s DNS servers for client name resolution, even if you are running your own DNS servers for other purposes. The main advantage of using your ISP s servers is to conserve your network s Internet bandwidth. Remember that the Internet name resolution requests that DNS servers receive from client resolvers are recursive que ries, giving the first server responsibility for sending iterative queries to other DNS servers on the Internet to resolve the name. When the DNS server receiving the recursive queries is on your private network, all the iterative queries the server generates and their responses go through your Internet access router, using your bandwidth (see Figure 4-4). If your cli ents use a DNS server on your ISP s network (which is nearly always a free service), only one query and one response go through your router. The ISP s DNS servers generate all the iterative queries, and these queries travel directly to the Internet.
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Requests/Replies Internet
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Request Reply Resolver Internal DNS Server
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WAN Connection
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Resolver
WAN Connection
ISP's DNS Server
Figure 4-4
Using the ISP s DNS server saves Internet bandwidth
Using NetBIOS Names
If computers on your network are running versions of Microsoft Windows earlier than Windows 2000, they are using NetBIOS names and must have a means of resolving those names into IP addresses. When Microsoft originally incorporated networking capabilities into the Windows operating systems, it relied on NetBIOS names to identify computers and on the NetBEUI protocol for communications. NetBEUI uses these names exclusively; the protocol has no other addressing system. Later, Microsoft adopted TCP/IP as its default protocols, but continued to use NetBIOS to provide friendly names for computers until the release of Active Directory with Windows 2000.
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4
Planning a Name Resolution Strategy
Off the Record These earlier Windows operating systems are capable of interacting with computers running Windows 2000 and later versions because the computers maintain an equivalent that is compatible with NetBIOS for every Active Directory name.
The NetBIOS namespace is flat, not hierarchical like the DNS namespace. Each computer and other entity has a single NetBIOS name up to 16 characters long, which must be unique on the network. In the Windows operating system, the sixteenth character is reserved for a code that identifies the type of resource represented by the name; therefore, the NetBIOS names you assign to computers running Windows operating systems can be no longer than 15 characters. The non-hierarchical nature of the NetBIOS namespace means that it is not as scaleable as DNS, and indeed it need not be, because NetBIOS is intended for private networks only, not for huge networks like the Internet.
NetBIOS Name Resolution Mechanisms
Windows has several name resolution mechanisms for NetBIOS names, which are as follows:
WINS WINS is a NetBIOS name server included with all current server versions of the Windows operating system, WINS registers the names and IP addresses of Windows NetBIOS computers as they start up and compiles its own name resolu tion database. Every computer running a Windows operating system includes a WINS client that an administrator must configure with the IP address of at least one WINS server on the network. Before the computer running the Windows operating system can communicate with another NetBIOS computer on the network, it sends a message called a NAME QUERY REQUEST as a unicast to its WINS server. The message contains the NetBIOS name of the other computer, and the WINS server responds with the IP address associated with the name. WINS servers are able to provide NetBIOS name resolution services for an entire enterprise network running Windows operating systems. Broadcast transmissions When an administrator does not configure a computer running a Windows operating system to use WINS for NetBIOS name resolution, the system attempts to resolve names by broadcasting a NAME QUERY REQUEST mes sage. The computer that possesses the name in the message is responsible for reply ing to the sender with its IP address. The broadcast transmission method is less efficient than WINS, both because broadcasts generate more network traffic than unicasts and because broadcast transmissions are limited to the local network. Lmhosts This text file contains a lookup table that is much like the Hosts file originally used by TCP/IP systems. Lmhosts name resolution is extremely fast, because no network communication is required, but administrators must update
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