java data matrix reader

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For instance, Console.WriteLine() comes from the System namespace; by adding it on top, you don t have to type System.Console.WriteLine(). This saves time, and it s easier to read. By adding this line of code, you re telling Visual Studio to look into that assembly for the metadata that will enable IntelliSense to be populated with the public/protected elements. After adding this line, you ll have access to those items whenever you have an instance of one of the types built in the library.

You can use the Ipconfig tool to view and to flush the DNS resolver cache. To view the DNS resolver cache

3

Ipconfig displays the contents of the DNS resolver cache, including the DNS resource records preloaded from the Hosts file as well as any recently queried names that were resolved by the system. After a certain amount of time, specified in the Time to Live (TTL) associated with the DNS resource record, the resolver discards the record from the cache. You can also flush the cache manually. After you flush the cache, the computer must query DNS servers again for any DNS resource records previously resolved by the computer. To flush the cache manually by using Ipconfig

The local Hosts file is preloaded into the resolver s cache and reloaded into the cache whenever Hosts is updated. The length of time for which a positive or negative response is cached depends on the values of entries in the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNSCache\ Parameters The TTL for positive responses is the lesser of the following values:

The number of seconds specified in the query response the resolver received The value of the registry entry MaxCacheEntryTtlLimit

thinnet) or 10Base-5 (also known as thicknet). These standards use coaxial cabling in a true bus configuration. All systems must be connected in series (like links in a chain) to maintain the network s integrity, and a break anywhere in the cabling (or even an improperly disconnected workstation) can bring down an entire segment. These older standards are becoming less and less common, and are undesirable for new installations.

The default TTL for positive responses is 86,400 seconds (1 day). The TTL for negative responses is the number of seconds specified in the registry entry NegativeCacheTime. The default TTL for negative responses is 300 seconds. If you do not want negative responses to be cached at all, set the value of NegativeCacheTime to 0. Caution Do not edit the registry unless you have no alternative. The Registry Editor bypasses standard safeguards, allowing settings that can damage your system or even require you to reinstall Windows. If you must edit the registry, back it up first.

Part IV:

Configuring subnet prioritization Each DNS database consists of resource records. In general, resource records contain information related to a particular host computer, such as its IP address, owner of the host, or the type of services it provides. Table 24-4 lists some of the common types of resource records.

Now that you know a little about Ethernet, you might wonder whether Ethernet is the kind of network you need. Table 3-1 explores the fundamental issues to consider before using Ethernet. Table 3-1. Ethernet Networking Features Networking Issue Ethernet Feature or Failure

Table 24-4

Description Start of Authority Explanation This record designates the start of a zone. It contains information such as the name of the zone, the e-mail address of the zone administrator, and settings that control how secondary DNS servers update the zone data files. This record lists the IP address of a particular host name. This is the key record for name resolution. This record designates a reverse mapping of a host IP address to a host DNS domain name. This record specifies an alias or nickname for the standard (canonical) host name. This record lists the host computer that is responsible for receiving e-mail sent to a domain. This record specifies the name server responsible for a given zone.

If the resolver receives multiple IP address mappings (A resource records) from a DNS server, and some of the records have IP addresses from networks to which the computer is directly connected, the resolver places those resource records first. This reduces network traffic across subnets by forcing computers to connect to network resources that are closer to them. For example, suppose there are three Web servers that all host the Web page for www.reskit.com and they are all located on different subnets. The DNS name server for the network contains the following resource records: