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Expense and availability Ethernet NICs, hubs, wiring, and gateways are all reasonably priced. You can also find Ethernet kits. All major networking manufacturers produce Ethernet products, and you can find Ethernet NICs for as little as $30. Hubs and switches can cost from $40 to $400 for models combining firewalls and switches for large workgroups.

There is no better way to dive into this subject than by going through the code. If the TestApplication.cs source code file is not already open, open it by right-clicking the TestApplication.cs file and selecting View Code. You should see red dots on the left side of the screen; those red dots are breakpoints. Figure 7-3 shows the source code and the breakpoints.

When a Windows XP Professional based computer s DNS resolver (client) receives a response to the query for the A record of www.reskit.com, it returns A records in order, starting with the IP addresses from subnets to which the computer is directly connected. For example, if a computer with the IP address 172.17.64.93 is queried for www.reskit.com, the resolver returns the resource records in the following order:

Subnet prioritization prevents the resolver from choosing the first IP address returned in the DNS query and using the DNS server s round robin feature (defined in RFC 1794.) With

Easy. Windows XP can automatically install NICs, and hub configuration is easy. Up to 1 Gbps with 10/100 being the standard at this time. Ethernet is the fastest type of network for the home or small office. Cabling can be difficult to run in homes or existing businesses and can be an eyesore if wall outlets are not available or installed. Excellent.

24:

round robin enabled, the server rotates the order of resource records returned when multiple A resource records exist for a queried DNS domain name. Thus, in the example described earlier, if a user queried for www.reskit.com, the name server replies to the first client request by ordering the addresses as follows:

172.16.64.11 172.17.64.22 172.18.64.33

If you decide that an Ethernet network is right for you, keep the following issues in mind: hubs), and Category 5 cabling.

It replies to the second client request by ordering the addresses as follows:

172.17.64.22 172.18.64.33 172.16.64.11

It replies to the third client request by ordering the addresses as follows:

3

172.18.64.33 172.16.64.11 172.17.64.22

When the debugger encounters a breakpoint, it stops executing the application. In this source code, one breakpoint is placed on the call to MessageBox.Show(myString);. Another

With round robin enabled, if clients are configured to use the first IP address in the list that they receive, different clients will use different IP addresses, thus balancing the load among multiple network resources with the same name. However, if the resolvers are configured for subnet prioritization, the resolvers reorder the list to favor IP addresses from networks to which they are directly connected, reducing the effectiveness of the round robin feature. Although subnet prioritization does reduce network traffic across subnets, in some cases you might prefer to have the round robin feature work as described in RFC 1794. If so, you can disable the subnet prioritization feature on your clients by adding the registry entry PrioritizeRecordData with a value of 0 (REG_DWORD data type) in the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DnsCache\ Parameters Preventing the resolver from accepting responses from nonqueried servers By default, the resolver accepts responses from servers that it did not query, as well as from those it did. This presents a possible security liability, in that unauthorized DNS servers might pass along invalid A resource records for the purpose of misdirecting subsequent DNS queries. If you want to disable this feature, add the registry entry QueryIpMatching with a value of 1 (REG_DWORD data type) to the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DnsCache\ Parameters 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.