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In this case, you want the user to know that an exception was raised, but you don t want the program to crash Here s an example that demonstrates this form of handling that I m sure you already know If you try to divide by zero in Microsoft Office Excel, Excel won t crash; it simply indicates that your entry results in a division-by-zero error and displays the #DIV/0! message in the cell An older way of doing things was to make your method return an integer to indicate success or failure And that s where people met with trouble, because between two applications, and sometimes between two functions, the same integer code meant two different things.

There are a few basic advantages with a dial-up connection:

Assigning each network segment a subnet identifier (ID) Correctly assigning IP addresses and subnet masks, and configuring packet forwarding on the computers connecting the subnets Configuring name resolution servers

Bridging the LAN segments that make up a home network simplifies the situation by creating a single subnet. The entire home network can then operate with a single subnet. DHCP client computers on any LAN segment in the home network automatically obtain an IP address, subnet mask, and default gateway from the host computer on which ICS is enabled. Note

Bridging is a MAC-layer activity, making use of a single subnet ID. ICS is a networklayer activity, employing a single public IP address. The two are not related. However, the Network Bridge works only with TCP/IP.

connection, typically costing around $20 a month for unlimited access. There are, however, some disadvantages as well:

You can configure your dial-up, virtual private network (VPN), and direct connections to enforce various levels of password authentication and data encryption. Authentication methods range from unencrypted to custom, such as the Extensible Authentication Protocol (EAP). EAP provides flexible support for a wide range of authentication methods, including smart cards, certificates, one-time passwords, and public keys. You can also specify the type of data encryption, depending on the type of authentication protocol (MS-CHAP, MS-CHAPv2, or Extensible Authentication Protocol-Transport Level Security [EAP-TLS]) that you choose. Finally, if you have sufficient permissions, you can configure callback options to save telephone charges and increase dial-up security. Advanced settings such as Autodial, callback preferences, network identification, and binding order are configured on the Advanced menu in the Network Connections folder. Optional networking components, such as the SNMP service, can also be installed on the Advanced menu. For more information about callback options and other advanced settings, see Managing Outgoing Connections earlier in this chapter.

Part IV:

If your Windows XP Professional based computer connects to a Windows 2000 based server or Windows Server 2003 based server, the remote access permissions granted to your computer by the server are based on the dial-up settings of your user account and remote access policies. Remote access policies are a set of conditions and connection settings that give network administrators more flexibility in granting remote access permissions and specifying connection requirements and restrictions. If the settings of your connection do not match at least one of the remote access policies, the connection attempt is rejected, regardless of your dial-up settings. The network administrator can configure Windows 2000 Server or Windows Server 2003 user accounts and domains to provide security by forcing encrypted authentication and encrypted data for remote communications. For more information about Windows 2000 security, see Windows 2000 Server Help. For more information about Windows Server 2003 security, see the Help and Support Center in Windows Server 2003.