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You can also implement a hybrid network. In this case, the WAP is typically connected to the modem as before and computers in fixed locations are connected using wired connections to Ethernet ports on the WAP. Most third-party WAPs have several Ethernet ports in addition to the wide area network (WAN) port that connects to the modem. You can wire the fixed computers directly to the WAP or you can connect them by using a switch (or a hub) and connect the switch to the WAP. Wireless-enabled devices connect directly to the WAP, and both wired and wireless devices are on the same network and obtain their IP configuration from the WAP, which provides DHCP and internal DNS services (in the case where a Wi-Fi enabled computer provides wireless access, DHCP and DNS services are provided through ICS). The WAP forwards any datagrams that need to go to the Internet (for example, browser requests) through the modem to your ISP, which provides external DNS resolution. Typically, you configure a third-party WAP by accessing a webpage interface and a Wi-Fi adapter card through a dialog box. Refer to the manufacturer s documentation for details.
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If you need to resolve a computer name on your internal network to an IP address (for example, if you entered ping Glasgow in the Command Prompt window), then the DNS service on your WAP or ICS computer provides the IPv4 address that corresponds to the computer name. If, on the other hand, you needed to resolve an FQDN on the Internet (if you entered http://www.contoso.com in your browser, for example), then that FQDN is resolved over the Internet. FQDNs are resolved over the Internet using a DNS server hierarchy and an iterative process. Although it is unlikely that the 70-620 examination will test your knowledge of iterative DNS queries, you will need to know how DNS works over the Internet if you intend to develop your career as a network engineer. For more information, access http://technet2.microsoft.com/WindowsServer /en/library/0bcd97e6-b75d-48ce-83ca-bf470573ebdc1033.mspx mfr=true.
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Traditionally, an ICS computer provided DNS, DHCP, and Internet connectivity for a wired SOHO network and a third-party WAP performed the same function for a wireless network. However, many modern computers (both desktop and laptop) include a built-in Wi-Fi adapter card, which means that the computer itself can act as a WAP. Windows Vista provides a wizard that lets you easily configure wireless access for such a computer. The same wizard lets you save wireless settings on a USB flash drive to enable you to join other wireless-enabled computers to your network. If you use this facility, the computer that you configure to provide wireless access is also configured for ICS, so it provides DHCP and DNS services on the SOHO network. Figure 7-7 shows the SOHO network configurations described in this lesson.
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Lesson 1: Using the Network And Sharing Center to Configure Networking
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wireless computers
To ISP and internet wireless computers WAP
modem
wired computer(s)
ICS computer To ISP and internet
modem switch
Figure 7-7
SOHO network configurations
Exam Tip
The 70-620 examination is likely to test the configuration in which a computer running Windows Vista is configured to provide both wireless access and DHCP and DNS services.
7
Configuring Network Connectivity
Setting Up a Network Connection
The first computer you install on a wired SOHO network will likely be connected to a modem through a USB or Ethernet connection. It will also have an Ethernet connection to enable computers and other devices to connect to it through a hub. Your ISP will give you instructions about how to establish an Internet connection and will provide a username and password. To connect to the Internet, you access the Network And Sharing Center from Control Panel, click Set Up A Connection Or Network, select Connect To The Internet, and click Next. You then select the method you are using to connect for example, Broadband PointTo-Point Protocol Over Ethernet (PPPoE) and enter the name and password that your ISP provided, as shown in Figure 7-8. If you choose to allow other people to use the connection, a UAC dialog box appears. When you click Connect, the wizard configures your Internet connection.
Figure 7-8
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